Document:

The Corridor Confirmation.

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DATE:                          July 30, 2007

AMENDED:                       August 16, 2007

TO:                            DEUTSCHE BANK NATIONAL TRUST COMPANY, not in
                               its individual capacity but solely as
                               Supplemental Interest Trustee on behalf of the
                               Supplemental Interest Trust with respect to
                               INDYMAC INDX MORTGAGE LOAN TRUST 2007-FLX6,
                               Mortgage Pass-Through Certificates, Series
                               2007-FLX6 ("Party B")
Attention:                     TRUST ADMINISTRATION IN07F6
Facsimile:                     714-656-2626
Phone:                         714-247-6000

FROM:                          MERRILL LYNCH CAPITAL SERVICES, INC. ("Party A")
CONTACT:                       THOMAS MOORE
EMAIL:                         thmoore@exchange.ml.com
TEL:                           212.236.8657
FAX:                           917.778.0836

SUBJECT:                       Cap Corridor

REFERENCE NUMBER:              07DL21884, 3651687, 3651703

THIS COMMUNICATION SUPERCEDES AND REPLACES ALL PRIOR COMMUNICATION BETWEEN THE
PARTIES HERETO WITH RESPECT TO THE TRANSACTION DESCRIBED BELOW.

The purpose of this long-form confirmation ("Long-form Confirmation") is to
confirm the terms and conditions of the current Transaction entered into on
the Trade Date specified below (the "Transaction") between Merrill Lynch
Capital Services, Inc. ("Party A") and Deutsche Bank National Trust Company,
not individually, but solely as supplemental interest trustee (the
"Supplemental Interest Trustee") on behalf of the supplemental interest trust
with respect to the IndyMac INDX Mortgage Loan Trust 2007-FLX6 Mortgage
Pass-Through Certificates, Series 2007-FLX6 (the "Supplemental Interest
Trust") ("Party B") created under the Pooling and Servicing Agreement, dated
as of June 1, 2007, among IndyMac MBS, Inc. as Depositor, IndyMac Bank, F.S.B.
as Seller and Servicer, Deutsche Bank National Trust Company as Trustee, Swap
Trustee and Supplemental Interest Trustee (the "Pooling and Servicing
Agreement"). This Long-form Confirmation evidences a complete and binding
agreement between you and us to enter into the Transaction on the terms set
forth below and replaces any previous agreement between us with respect to the
subject matter hereof. Item 2 of this Long-form Confirmation constitutes a
"Confirmation" as referred to in the ISDA Master Agreement (defined below);
Item 3 of this Long-form Confirmation constitutes a "Schedule" as referred to
in the ISDA Master Agreement; and Annex A hereto constitutes Paragraph 13 of a
Credit Support Annex to the Schedule.

Item 1.   The Confirmation set forth at Item 2 hereof shall supplement,
          form a part of, and be subject to an agreement in the form of the
          ISDA Master Agreement (Multicurrency - Cross Border) as published
          and copyrighted in 1992 by the International Swaps and Derivatives
          Association, Inc. (the "ISDA Master Agreement"), as if Party A and
          Party B had executed an agreement in such form on the date hereof,
          with a Schedule as set forth in Item 3 of this Long-form
          Confirmation, and an ISDA Credit Support Annex (Bilateral Form -
          ISDA Agreements Subject to New York Law Only version) as published
          and copyrighted in 1994 by the International Swaps and Derivatives
          Association, Inc., with Paragraph 13 thereof as set forth in Annex A
          hereto (the "Credit Support Annex"). For the avoidance of doubt, the
          Transaction described herein shall be the sole Transaction governed
          by such ISDA Master Agreement.

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Item 2.   The terms of the particular Transaction to which this
          Confirmation relates are as follows:

          Type of Transaction:               CAP CORRIDOR TRANSACTION

          Notional Amount:                   USD 495,500,000.00 subject to
                                             amortization in accordance with
                                             Schedule A, attached hereto.

          Trade Date:                        July 30, 2007

          Effective Date:                    July 31, 2007

          Termination Date:                  June 25, 2008, subject to
                                             adjustment in accordance with the
                                             Modified Following Business Day
                                             Convention.

          Floating Amounts:

              Floating Rate Payer:           Party A

              CAP Rate:                      See Schedule A, attached hereto.

              Floating Rate Payer
              Period End Date(s):            The 25th calendar day of each
                                             month during the Term of this
                                             Transaction, commencing August
                                             25, 2007, and ending on the
                                             Termination Date, inclusive,
                                             subject to adjustment in
                                             accordance with the Modified
                                             Following Business Day
                                             Convention.

              Floating Rate Payer
              Payment Dates:                 Two New York Business Days prior
                                             to each Floating Rate Payer
                                             Period End Date in each month
                                             during the Term of this
                                             Transaction, commencing August
                                             23, 2007, and ending on the June
                                             23, 2008, inclusive, subject to
                                             adjustment in accordance with the
                                             Modified Following Business Day
                                             Convention.

              Floating Rate Option:          USD-LIBOR-BBA, subject to a
                                             maximum of 10.220%

              Designated Maturity:           One month.

              Spread:                        Inapplicable.

              Floating Rate Day
              Count Fraction:                Actual/360

              No Adjustment of
              Period End Date(s):            Inapplicable

              Reset Dates:                   The first day of each Floating
                                             Rate Payer Calculation Period.

              Rate Cut-Off Dates:            Inapplicable.

              Averaging:                     Inapplicable.

              Compounding:                   Inapplicable.
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              Business Days:                 New York

              Business Day Convention:       Modified Following.

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Item 3.   Provisions Deemed Incorporated in a Schedule to the ISDA Master
          Agreement:

Part 1.   Termination Provisions.

For the purposes of this Agreement:

(a)  "Specified Entity" will not apply to Party A or Party B for any purpose.

(b)  "Specified Transaction" will have the meaning specified in Section 14.

(c)  Events of Default.

     The statement below that an Event of Default will apply to a specific party
     means that upon the occurrence of such an Event of Default with respect to
     such party, the other party shall have the rights of a Non-defaulting Party
     under Section 6 of this Agreement; conversely, the statement below that
     such event will not apply to a specific party means that the other party
     shall not have such rights.

     (i)    The "Failure to Pay or Deliver" provisions of Section 5(a)(i) will
            apply to Party A and will apply to Party B; provided, however, that
            Section 5(a)(i) is hereby amended by replacing the word "third" with
            the word "first"; provided, further, that notwithstanding anything
            to the contrary in Section 5(a)(i), any failure by Party A to comply
            with or perform any obligation to be complied with or performed by
            Party A under the Credit Support Annex shall not constitute an Event
            of Default under Section 5(a)(i) unless a Moody's Second Trigger
            Downgrade Event has occurred and is continuing and at least 30 Local
            Business Days have elapsed since such Moody's Second Trigger
            Downgrade Event first occurred.

     (ii)   The "Breach of Agreement" provisions of Section 5(a)(ii) will apply
            to Party A and will not apply to Party B.

     (iii)  The "Credit Support Default" provisions of Section 5(a)(iii) will
            apply to Party A and will not apply to Party B except that Section
            5(a)(iii)(1) will apply to Party B solely in respect of Party B's
            obligations under Paragraph 3(b); provided, however, that
            notwithstanding anything to the contrary in Section 5(a)(iii)(1),
            any failure by Party A to comply with or perform any obligation to
            be complied with or performed by Party A under the Credit Support
            Annex shall not constitute an Event of Default under Section
            5(a)(iii) unless a Moody's Second Trigger Downgrade Event has
            occurred and is continuing and at least 30 Local Business Days have
            elapsed since such Moody's Second Trigger Downgrade Event first
            occurred.

     (iv)   The "Misrepresentation" provisions of Section 5(a)(iv) will apply to
            Party A and will not apply to Party B.

     (v)    The "Default under Specified Transaction" provisions of Section
            5(a)(v) will apply to Party A and will not apply to Party B.

     (vi)   The "Cross Default" provisions of Section 5(a)(vi) will apply to
            Party A and will not apply to Party B. For purposes of Section
            5(a)(vi), solely with respect to Party A:

            "Specified Indebtedness" will have the meaning specified in Section
            14.

            "Threshold Amount" means with respect to Party A an amount equal to
            three percent (3%) of the shareholders' equity of Party A or, if
            applicable, a guarantor under an Eligible Guarantee with credit
            ratings at least equal to the S&P Required Ratings Threshold and the
            Moody's Second Trigger Threshold (as shown in the most recent annual
            audited financial statements of such entity determined in accordance
            with generally accepted accounting principles).

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     (vii)  The "Bankruptcy" provisions of Section 5(a)(vii) will apply to
            Party A and will apply to Party B; provided, however, that, for
            purposes of applying Section 5(a)(vii) to Party B: (A) Section
            5(a)(vii)(2) shall not apply, (B) Section 5(a)(vii)(3) shall not
            apply to any assignment, arrangement or composition that is effected
            by or pursuant to the Pooling and Servicing Agreement, (C) Section
            5(a)(vii)(4) shall not apply to a proceeding instituted, or a
            petition presented, by Party A or any of its Affiliates (for
            purposes of Section 5(a)(vii)(4), Affiliate shall have the meaning
            set forth in Section 14, notwithstanding anything to the contrary in
            this Agreement), (D) Section 5(a)(vii)(6) shall not apply to any
            appointment that is effected by or pursuant to the Pooling and
            Servicing Agreement, or any appointment to which Party B has not yet
            become subject; (E) Section 5(a)(vii)(7) shall not apply; (F)
            Section 5(a)(vii)(8) shall apply only to the extent of any event
            which has an effect analogous to any of the events specified in
            clauses (1), (3), (4), (5) or (6) of Section 5(a)(vii), in each case
            as modified in this Part 1(c)(vii), and (G) Section 5(a)(vii)(9)
            shall not apply.

     (viii) The "Merger Without Assumption" provisions of Section 5(a)(viii)
            will apply to Party A and will not apply to Party B.

(d)  Termination Events.

     The statement below that a Termination Event will apply to a specific
     party means that upon the occurrence of such a Termination Event, if such
     specific party is the Affected Party with respect to a Tax Event, the
     Burdened Party with respect to a Tax Event Upon Merger (except as noted
     below) or the non-Affected Party with respect to a Credit Event Upon
     Merger, as the case may be, such specific party shall have the right to
     designate an Early Termination Date in accordance with Section 6 of this
     Agreement; conversely, the statement below that such an event will not
     apply to a specific party means that such party shall not have such
     right; provided, however, with respect to "Illegality" the statement that
     such event will apply to a specific party means that upon the occurrence
     of such a Termination Event with respect to such party, either party
     shall have the right to designate an Early Termination Date in accordance
     with Section 6 of this Agreement.

     (i)   The "Illegality" provisions of Section 5(b)(i) will apply to Party A
           and will apply to Party B.

     (ii)  The "Tax Event" provisions of Section 5(b)(ii) will apply to Party A
           except that, for purposes of the application of Section 5(b)(ii) to
           Party A, Section 5(b)(ii) is hereby amended by deleting the words
           "(x) any action taken by a taxing authority, or brought in a court
           of competent jurisdiction, on or after the date on which a
           Transaction is entered into (regardless of whether such action is
           taken or brought with respect to a party to this Agreement) or (y)",
           and the "Tax Event" provisions of Section 5(b)(ii) will apply to
           Party B.

     (iii) The "Tax Event Upon Merger" provisions of Section 5(b)(iii) will
           apply to Party A and will apply to Party B, provided that Party A
           shall not be entitled to designate an Early Termination Date by
           reason of a Tax Event upon Merger in respect of which it is the
           Affected Party.

     (iv) The "Credit Event Upon Merger" provisions of Section 5(b)(iv) will
          not apply to Party A and will not apply to Party B.

(e)  The "Automatic Early Termination" provision of Section 6(a) will not
     apply to Party A and will not apply to Party B.

(f)  Payments on Early Termination. For the purpose of Section 6(e) of this
     Agreement:

     (i)  Market Quotation will apply, provided, however, that,
          notwithstanding anything to the contrary in this Agreement, if an
          Early Termination Date has been designated as a result of a
          Derivative Provider Trigger Event, the following provisions will
          apply:

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          (A)  The definition of Market Quotation in Section 14 shall be
               deleted in its entirety and replaced with the following:

               "Market Quotation" means, with respect to one or more
               Terminated Transactions, a Firm Offer which is (1) made by an
               Eligible Replacement, (2) for an amount that would be paid to
               Party B (expressed as a negative number) or by Party B
               (expressed as a positive number) in consideration of an
               agreement between Party B and such Eligible Replacement to
               enter into a Replacement Transaction, and (3) made on the basis
               that Unpaid Amounts in respect of the Terminated Transaction or
               group of Transactions are to be excluded but, without
               limitation, any payment or delivery that would, but for the
               relevant Early Termination Date, have been required (assuming
               satisfaction of each applicable condition precedent) after that
               Early Termination Date is to be included.

          (B)  The definition of Settlement Amount shall be deleted in its
               entirety and replaced with the following:

               "Settlement Amount" means, with respect to any Early
               Termination Date, an amount (as determined by Party B) equal
               to:

               (a)  if, on or prior to such Early Termination Date, a Market
                    Quotation for the relevant Terminated Transaction or group
                    of Terminated Transactions is accepted by Party B so as to
                    become legally binding, the Termination Currency
                    Equivalent of the amount (whether positive or negative) of
                    such Market Quotation;

               (b)  if, on such Early Termination Date, no Market Quotation
                    for the relevant Terminated Transaction or group of
                    Terminated Transactions has been accepted by Party B so as
                    to become legally binding and one or more Market
                    Quotations from Approved Replacements have been
                    communicated to Party B and remain capable of becoming
                    legally binding upon acceptance by Party B, the
                    Termination Currency Equivalent of the amount (whether
                    positive or negative) of the lowest of such Market
                    Quotations (for the avoidance of doubt, (I) a Market
                    Quotation expressed as a negative number is lower than a
                    Market Quotation expressed as a positive number and (II)
                    the lower of two Market Quotations expressed as negative
                    numbers is the one with the largest absolute value); or

               (c)  if, on such Early Termination Date, no Market Quotation
                    for the relevant Terminated Transaction or group of
                    Terminated Transactions is accepted by Party B so as to
                    become legally binding and no Market Quotation from an
                    Approved Replacement has been communicated to Party B and
                    remains capable of becoming legally binding upon
                    acceptance by Party B, Party B's Loss (whether positive or
                    negative and without reference to any Unpaid Amounts) for
                    the relevant Terminated Transaction or group of Terminated
                    Transactions."

          (C)  If Party B requests Party A in writing to obtain Market
               Quotations, Party A shall use its reasonable efforts to do so
               before the Early Termination Date.

          (D)  If the Settlement Amount is a negative number, Section
               6(e)(i)(3) shall be deleted in its entirety and replaced with
               the following:

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               "(3) Second Method and Market Quotation. If the Second Method
               and Market Quotation apply, (I) Party B shall pay to Party A
               an amount equal to the absolute value of the Settlement Amount
               in respect of the Terminated Transactions, (II) Party B shall
               pay to Party A the Termination Currency Equivalent of the
               Unpaid Amounts owing to Party A and (III) Party A shall pay to
               Party B the Termination Currency Equivalent of the Unpaid
               Amounts owing to Party B; provided, however, that (x) the
               amounts payable under the immediately preceding clauses (II)
               and (III) shall be subject to netting in accordance with
               Section 2(c) of this Agreement and (y) notwithstanding any
               other provision of this Agreement, any amount payable by Party
               A under the immediately preceding clause (III) shall not be
               netted against any amount payable by Party B under the
               immediately preceding clause (I)."

          (E)  At any time on or before the Early Termination Date at which
               two or more Market Quotations from Approved Replacements have
               been communicated to Party B and remain capable of becoming
               legally binding upon acceptance by Party B, Party B shall be
               entitled to accept only the lowest of such Market Quotations
               (for the avoidance of doubt, (I) a Market Quotation expressed
               as a negative number is lower than a Market Quotation expressed
               as a positive number and (II) the lower of two Market
               Quotations expressed as negative numbers is the one with the
               largest absolute value).

          (F)  In determining whether or not a Firm Offer satisfies clause
               (B)(y) of the definition of Replacement Transaction and whether
               or not a proposed transfer satisfies clause (e)(B)(y) of the
               definition of Permitted Transfer, Party B shall act in a
               commercially reasonable manner.

     (ii) The Second Method will apply.

(g)  "Termination Currency" means USD.

(h)  Additional Termination Events. Additional Termination Events will apply
     as provided in Part 5(c).

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Part 2.   Tax Matters.

(a)  Tax Representations.

     (i)  Payer Representations. For the purpose of Section 3(e) of this
          Agreement:

          (A)  Party A makes the following representation:

               It is not required by any applicable law, as modified by the
               practice of any relevant governmental revenue authority, of any
               Relevant Jurisdiction to make any deduction or withholding for
               or on account of any Tax from any payment (other than interest
               under Section 2(e), 6(d)(ii) or 6(e) of this Agreement) to be
               made by it to the other party under this Agreement. In making
               this representation, it may rely on: the accuracy of any
               representations made by the other party pursuant to Section
               3(f) of this Agreement; (ii) the satisfaction of the agreement
               contained in Section 4(a)(i) or 4(a)(iii) of this Agreement and
               the accuracy and effectiveness of any document provided by the
               other party pursuant to Section 4(a)(i) or 4(a)(iii) of this
               Agreement; and (iii) the satisfaction of the agreement of the
               other party contained in Section 4(d) of this Agreement,
               provided that it shall not be a breach of this representation
               where reliance is placed on clause (ii) and the other party
               does not deliver a form or document under Section 4(a)(iii) by
               reason of material prejudice to its legal or commercial
               position.

               Party B: None

     (ii) Payee Representations. For the purpose of Section 3(f) of this
          Agreement:

          (A)  Party A makes the following representation(s):

               Party A is a corporation organized under the laws of the State
               of Delaware.

          (B)  Party B makes the following representation(s):

               Party B : None

(b)  Tax Provisions.

     (i)  Gross Up. Section 2(d)(i)(4) shall not apply to Party B as X, and
          Section 2(d)(ii) shall not apply to Party B as Y, in each case such
          that Party B shall not be required to pay any additional amounts
          referred to therein.

     (ii) Indemnifiable Tax. The definition of "Indemnifiable Tax" in Section
          14 is deleted in its entirety and replaced with the following:

          "Indemnifiable Tax" means, in relation to payments by Party A, any
          Tax and, in relation to payments by Party B, no Tax.

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Part 3.  Agreement to Deliver Documents.

(a)  For the purpose of Section 4(a)(i), tax forms, documents, or certificates
     to be delivered are:

Party required to   Form/Document/                   Date by which
deliver document    Certificate                      to be delivered

Party A           An original properly completed   (i) upon execution of this
                  and executed United States       Agreement, (ii) on or before
                  Internal Revenue Service Form    the first payment date under
                  W-9 (or any successor thereto)   this Agreement, including
                  with respect to any payments     any Credit Support Document,
                  received or to be received by    (iii) promptly upon the
                  Party A that eliminates U.S.     reasonable demand by Party
                  federal withholding and backup   B, (iv) prior to the
                  withholding Tax on payments to   expiration or obsolescence
                  Party A under this Agreement.    of any previously delivered
                                                   form, and (v) promptly upon
                                                   the information on any such
                                                   previously delivered form
                                                   becoming inaccurate or
                                                   incorrect.

Party B           (i) Upon execution of this       (i) upon execution of this
                  Agreement, an executed United    Agreement, (ii) on or before
                  States Internal Revenue          the first payment date under
                  Service Form W-[9] [8BEN]        this Agreement, including
                  [8ECI] [8IMY including           any Credit Support Document,
                  applicable attachments] (or      (iii) in the case of a tax
                  any successor thereto) with      certification form other
                  respect to any payments          than a Form W-9, before
                  received or to be received by    December 31 of each third
                  the initial beneficial owner     succeeding calendar year,
                  of payments to Party B under     (iv) promptly upon the
                  this Agreement, and (ii)         reasonable demand by Party
                  thereafter, the appropriate      B, (v) prior to the
                  tax certification form (i.e.,    expiration or obsolescence
                  IRS Form W-9 or IRS Form         of any previously delivered
                  W-8BEN, W-8IMY, W-8EXP or        form, and (vi) promptly upon
                  W-8ECI, as applicable (or any    knowledge that the
                  successor form thereto)) with    information on any such
                  respect to any payments          previously delivered form
                  received or to be received by    becoming inaccurate or
                  the beneficial owner of          incorrect.
                  payments to Party B under this
                  Agreement from time to time.

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(b)  For the purpose of Section 4(a)(ii), other documents to be delivered are:

<TABLE>
<CAPTION>
Party required to deliver document   Form/Document/Certificate          Date by which to be delivered      Covered by Section 3(d)
                                                                                                           Representation
<S>                                  <C>                                <C>                                <C>
Party A and Party B                  Any documents required by the      Upon the execution and delivery    Yes
                                     receiving party to evidence the    of this Agreement
                                     authority of the delivering
                                     party or its Credit Support
                                     Provider, if any, for it to
                                     execute and deliver the
                                     Agreement, each Confirmation,
                                     and any Credit Support Documents
                                     to which it is a party, and to
                                     evidence the authority of the
                                     delivering party or its Credit
                                     Support Provider to perform its
                                     obligations under the Agreement,
                                     each Confirmation and any Credit
                                     Support Document, as the case
                                     may be

Party A and Party B                  A certificate of an authorized     Upon the execution and delivery    Yes
                                     officer of the party, as to the    of this Agreement
                                     incumbency and authority of the
                                     respective officers of the party
                                     signing the Agreement, each
                                     Confirmation, and any relevant
                                     Credit Support Document, as the
                                     case may be

Party A                              Annual Report of Party A           Promptly upon becoming publicly    Yes
                                     containing consolidated            available
                                     financial statements certified
                                     by independent certified public
                                     accountants and prepared in
                                     accordance with generally
                                     accepted accounting principles
                                     in the country in which Party A
                                     is organized

Party A                              Quarterly Financial Statements     Promptly upon becoming publicly    Yes
                                     of Party A containing unaudited,   available
                                     consolidated financial
                                     statements of Party A's fiscal
                                     quarter prepared in accordance
                                     with generally accepted
                                     accounting principles in the
                                     country in which Party A is
                                     organized

Party A                              An opinion of counsel to Party A   Upon the execution and delivery     No
                                     reasonably acceptable to Party     of this Agreement
                                     B.

Party A                              A guarantee of Merrill Lynch &     Upon the execution and delivery     No
                                     Co., Inc.                          of this Agreement

Party A                              An opinion of counsel to Party     Upon the execution and delivery     No
                                     A's Guarantor reasonably           of this Agreement
                                     acceptable to Party B
</TABLE>

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Part 4.  Miscellaneous.

(a)       Address for Notices: For the purposes of Section 12(a) of this
          Agreement:

          Address for notices or communications to Party A:

          Address:          Merrill Lynch World Headquarters
                            4 World Financial Center, 18th Floor
                            New York, New York 10080
          Attention:        Swap Group
          Facsimile No.:    917-778-0836
          Telephone No.:    212-449-2467

          (For all purposes)

          Additionally, a copy of all notices pursuant to Sections 5, 6, and 7
          as well as any changes to counterparty's address, telephone number or
          facsimile number should be sent to:

                            GMI Counsel
                            Merrill Lynch World Headquarters
                            4 World Financial Center, 12th Floor
                            New York, New York 10080
          Attention:        Swaps Legal
          Facsimile No.:    212-449-6993

          Address for notices or communications to Party B:

          Address:          IndyMac INDX Mortgage Loan Trust 2007-FLX6
                            c/o Deutsche Bank National Trust Company
                            1761 East St. Andrew Place
                            Santa Ana, CA 92705
          Attention:        Trust Administration IN07F6
          Facsimile:        714-656-2626
          Phone:            714-247-6000

         (For all purposes)

(b)       Process Agent. For the purpose of Section 13(c):

          Party A appoints as its Process Agent: Not applicable.

          Party B appoints as its Process Agent: Not applicable.

(c)       Offices. The provisions of Section 10(a) will apply to this
          Agreement; neither Party A nor Party B has any Offices other than as
          set forth in the Notices Section and Party A agrees that, for
          purposes of Section 6(b) of this Agreement, it shall not in the
          future have any Office other than one in the United States.

(d)       Multibranch Party. For the purpose of Section 10(c) of this
          Agreement:

          Party A is not a Multibranch Party.

          Party B is not a Multibranch Party.

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(e)       Calculation Agent. The Calculation Agent is Party A; provided,
          however, that if an Event of Default shall have occurred with respect
          to Party A, Party B shall have the right to appoint as Calculation
          Agent a financial institution which would qualify as a Reference
          Market-maker, reasonably acceptable to Party A, the cost for which
          shall be borne by Party A.

(f)       Credit Support Document.

          Party A:       The Credit Support Annex, and any guarantee in
                         support of Party A's obligations under this
                         Agreement.

          Party B:       The Credit Support Annex, solely in respect of Party
                         B's obligations under Paragraph 3(b) of the Credit
                         Support Annex.

(g)       Credit Support Provider.

          Party A:       The guarantor under any guarantee in support of Party
                         A's obligations under this Agreement.

          Party B:       None.

(h)       Governing Law. The parties to this Agreement hereby agree that the
          law of the State of New York shall govern their rights and duties in
          whole (including any claim or controversy arising out of or relating
          to this Agreement), without regard to the conflict of law provisions
          thereof other than New York General Obligations Law Sections 5-1401
          and 5-1402.

(i)       Netting of Payments. Subparagraph (ii) of Section 2(c) will apply to
          each Transaction hereunder.

(j)       Affiliate. "Affiliate" shall have the meaning assigned thereto in
          Section 14; provided, however, that Party B shall be deemed to have
          no Affiliates for purposes of this Agreement, including for purposes
          of Section 6(b)(ii).

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Part 5.   Other Provisions.

(a)       Definitions. Unless otherwise specified in a Confirmation, this
          Agreement and each Transaction under this Agreement are subject to
          the 2000 ISDA Definitions as published and copyrighted in 2000 by
          the International Swaps and Derivatives Association, Inc. (the
          "Definitions"), and will be governed in all relevant respects by the
          provisions set forth in the Definitions, without regard to any
          amendment to the Definitions subsequent to the date hereof. The
          provisions of the Definitions are hereby incorporated by reference
          in and shall be deemed a part of this Agreement, except that (i)
          references in the Definitions to a "Swap Transaction" shall be
          deemed references to a "Transaction" for purposes of this Agreement,
          and (ii) references to a "Transaction" in this Agreement shall be
          deemed references to a "Swap Transaction" for purposes of the
          Definitions. Each term capitalized but not defined in this Agreement
          shall have the meaning assigned thereto in the Pooling and Servicing
          Agreement.

          Each reference herein to a "Section" (unless specifically
          referencing the Pooling and Servicing Agreement) or to a "Section"
          "of this Agreement" will be construed as a reference to a Section of
          the ISDA Master Agreement; each herein reference to a "Part" will be
          construed as a reference to the Schedule to the ISDA Master
          Agreement; each reference herein to a "Paragraph" will be construed
          as a reference to a Paragraph of the Credit Support Annex.

(b)       Amendments to ISDA Master Agreement.

          (i)   Single Agreement. Section 1(c) is hereby amended by the adding
                the words "including, for the avoidance of doubt, the Credit
                Support Annex" after the words "Master Agreement".

          (ii)  Conditions Precedent. Section 2(a)(iii) is hereby amended by
                adding the following at the end thereof:

                Notwithstanding anything to the contrary in Section
                2(a)(iii)(1), if an Event of Default with respect to Party B or
                Potential Event of Default with respect to Party B has occurred
                and been continuing for more than 30 Local Business Days and no
                Early Termination Date in respect of the Affected Transactions
                has occurred or been effectively designated by Party A, the
                obligations of Party A under Section 2(a)(i) shall cease to be
                subject to the condition precedent set forth in Section
                2(a)(iii)(1) with respect to such specific occurrence of such
                Event of Default or such Potential Event of Default (the
                "Specific Event"); provided, however, for the avoidance of
                doubt, the obligations of Party A under Section 2(a)(i) shall
                be subject to the condition precedent set forth in Section
                2(a)(iii)(1) (subject to the foregoing) with respect to any
                subsequent occurrence of the same Event of Default with respect
                to Party B or Potential Event of Default with respect to Party
                B after the Specific Event has ceased to be continuing and with
                respect to any occurrence of any other Event of Default with
                respect to Party B or Potential Event of Default with respect
                to Party B that occurs subsequent to the Specific Event.

          (iii) Change of Account. Section 2(b) is hereby amended by the
                addition of the following after the word "delivery" in the
                first line thereof: "to another account in the same legal and
                tax jurisdiction as the original account".

          (iv)  Representations. Section 3 is hereby amended by adding at the
                end thereof the following subsection (g):

                "(g) Relationship Between Parties.

                     (1)  Nonreliance. (i) It is not relying on any statement
                          or representation of the other party (whether written
                          or oral) regarding any Transaction hereunder, other
                          than the representations expressly made in this
                          Agreement or the Confirmation in respect of that
                          Transaction and (ii) it has consulted with its own
                          legal, regulatory, tax, business, investment,
                          financial and accounting advisors to the extent it
                          has deemed necessary, and it has made its own
                          investment, hedging and trading decisions based upon
                          its

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                          own judgment and upon any advice from such advisors
                          as it has deemed necessary and not upon any view
                          expressed by the other party.

                     (2)  Evaluation and Understanding. (i) It has the capacity
                          to evaluate (internally or through independent
                          professional advice) each Transaction and has made
                          its own decision to enter into the Transaction and
                          (ii) it understands the terms, conditions and risks
                          of the Transaction and is willing and able to accept
                          those terms and conditions and to assume those risks,
                          financially and otherwise.

                     (3)  Purpose. It is entering into the Transaction for the
                          purposes of managing its borrowings or investments,
                          hedging its underlying assets or liabilities or in
                          connection with a line of business.

                     (4)  Status of Parties. The other party is not acting as
                          an agent, fiduciary or advisor for it in respect of
                          the Transaction.

                     (5)  Eligible Contract Participant. It is an "eligible
                          swap participant" as such term is defined in, Section
                          35.1(b)(2) of the regulations (17 C.F.R. 35)
                          promulgated under, and an "eligible contract
                          participant" as defined in Section 1(a)(12) of the
                          Commodity Exchange Act, as amended."

          (v)   Transfer to Avoid Termination Event. Section 6(b)(ii) is hereby
                amended (i) by deleting the words "or if a Tax Event Upon
                Merger occurs and the Burdened Party is the Affected Party,"
                and the words ", which consent will not be withheld if such
                other party's policies in effect at such time would permit it
                to enter into transactions with the transferee on the terms
                proposed" and (ii) by deleting the words "to transfer" and
                inserting the words "to effect a Permitted Transfer" in lieu
                thereof.

          (vi)  Jurisdiction. Section 13(b) is hereby amended by: (i) deleting
                in the second line of subparagraph (i) thereof the word "non-",
                (ii) deleting "; and" from the end of subparagraph (i) and
                inserting "." in lieu thereof, and (iii) deleting the final
                paragraph thereof.

          (vii) Local Business Day. The definition of Local Business Day in
                Section 14 is hereby amended by the addition of the words "or
                any Credit Support Document" after "Section 2(a)(i)" and the
                addition of the words "or Credit Support Document" after
                "Confirmation".

(c)       Additional Termination Events. The following Additional Termination
          Events will apply:

          (i)   Failure to Post Collateral. If Party A has failed to comply
                with or perform any obligation to be complied with or performed
                by Party A in accordance with the Credit Support Annex and such
                failure has not given rise to an Event of Default under Section
                5(a)(i) or Section 5(a)(iii), then an Additional Termination
                Event shall have occurred with respect to Party A and Party A
                shall be the sole Affected Party with respect to such
                Additional Termination Event.

          (ii)  Second Rating Trigger Replacement. The occurrence of any event
                described in this Part 5(c)(ii) shall constitute an Additional
                Termination Event with respect to Party A and Party A shall be
                the sole Affected Party with respect to such Additional
                Termination Event.

                (A)  A Moody's Second Trigger Downgrade Event has occurred and
                     is continuing and at least 30 Local Business Days have
                     elapsed since such Moody's Second Trigger Downgrade Event
                     first occurred, and at least one Eligible Replacement has
                     made a Firm Offer that would, assuming the occurrence of
                     an Early Termination Date, qualify as a Market Quotation
                     (on the basis that Part 1(f)(i)(A) applies) and which
                     remains capable of becoming legally binding upon
                     acceptance.

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                (B)  An S&P Required Ratings Downgrade Event has occurred and
                     is continuing and at least 60 calendar days have elapsed
                     since such S&P Required Ratings Downgrade Event first
                     occurred.

          (iii) [Reserved.]

          (iv)  [Reserved.]

          (v)   [Reserved.]

          (vi)

                Optional Termination of Securitization. An Additional
                Termination Event shall occur upon the earlier of (i) the
                occurrence of an Optional Termination in accordance with
                Article 9 of the Pooling and Servicing Agreement or (ii) notice
                to Certificateholders of such Optional Termination becoming
                unrescindable, in accordance with Article 9 of the Pooling and
                Servicing Agreement. Party B shall be the sole Affected Party
                with respect to such Additional Termination Event; provided,
                however, that notwithstanding anything to the contrary in
                Section 6(b)(iv), only Party B may designate an Early
                Termination Date as a result of this Additional Termination
                Event.

(d)       Required Ratings Downgrade Event. If a Required Ratings Downgrade
          Event has occurred and is continuing, then Party A shall, at its own
          expense, use commercially reasonable efforts to, as soon as
          reasonably practicable, either (A) effect a Permitted Transfer or (B)
          procure an Eligible Guarantee by a guarantor with credit ratings at
          least equal to the S&P Required Ratings Threshold and the Moody's
          Second Trigger Threshold.

(e)       Compliance with Item 1115 of Regulation AB.

          Party A and Party B hereby agree that the terms of the Item 1115
          Agreement, dated as of June 29, 2006 (the "Item 1115 Agreement"),
          among IndyMac Bank, F.S.B., IndyMac MBS, Inc., IndyMac ABS, Inc. and
          Party A shall be incorporated by reference into this Agreement and
          Party B shall be an express third party beneficiary of the Item 1115
          Agreement. A copy of the Item 1115 Agreement is annexed hereto at
          Annex B

(f)       Transfers.

          (i)  Section 7 is hereby amended to read in its entirety as follows:

               "Neither this Agreement nor any interest or obligation in or
               under this Agreement may be transferred (whether by way of
               security or otherwise) by either party unless (a) the prior
               written consent of the other party is obtained and (b) the
               Rating Agency Condition has been satisfied with respect to S&P
               except that:

               (a)  Party A may make a Permitted Transfer (1) pursuant to
                    Section 6(b)(ii) or the Item 1115 Agreement incorporated
                    by reference pursuant to Part 5(e) above, (2) pursuant to
                    a consolidation or amalgamation with, or merger with or
                    into, or transfer of all or substantially all its assets
                    to, another entity (but without prejudice to any other
                    right or remedy under this

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                    Agreement), or (3) at any time at which no Relevant Entity
                    has credit ratings at least equal to the Approved Ratings
                    Threshold;

               (b)  Party B may transfer its rights and obligations hereunder
                    in connection with a transfer pursuant to Section 8.09 of
                    the Pooling and Servicing Agreement, and

               (c)  a party may make such a transfer of all or any part of its
                    interest in any amount payable to it from a Defaulting
                    Party under Section 6(e).

               Any purported transfer that is not in compliance with this
               Section will be void.

          (ii) If an Eligible Replacement has made a Firm Offer (which remains
               an offer that will become legally binding upon acceptance by
               Party B) to be the transferee pursuant to a Permitted Transfer,
               Party B shall, at Party A's written request and at Party A's
               expense, take any reasonable steps required to be taken by
               Party B to effect such transfer.

(g)       Non-Recourse. Party A acknowledges and agrees that, notwithstanding
          any provision in this Agreement to the contrary, the obligations of
          Party B hereunder are limited recourse obligations of Party B,
          payable solely from the Supplemental Interest Trust and the proceeds
          thereof, and that Party A will not have any recourse to any of the
          directors, officers, agents, employees, shareholders or affiliates
          of the Party B with respect to any claims, losses, damages,
          liabilities, indemnities or other obligations in connection with any
          transactions contemplated hereby. In the event that the Supplemental
          Interest Trust and the proceeds thereof, should be insufficient to
          satisfy all claims outstanding and following the realization of the
          account held by the Supplemental Interest Trust and the proceeds
          thereof, any claims against or obligations of Party B under the ISDA
          Master Agreement or any other confirmation thereunder still
          outstanding shall be extinguished and thereafter not revive. This
          provision will survive the termination of this Agreement.

(h)       [Reserved.]

(i)       Rating Agency Notifications. Notwithstanding any other provision of
          this Agreement, no Early Termination Date shall be effectively
          designated hereunder by Party B and no transfer of any rights or
          obligations under this Agreement shall be made by either party unless
          each Rating Agency has been provided prior written notice of such
          designation or transfer.

(j)       No Set-off. Except as expressly provided for in Section 2(c), Section
          6 or Part 1(f)(i)(D) hereof, and notwithstanding any other provision
          of this Agreement or any other existing or future agreement, each
          party irrevocably waives any and all rights it may have to set off,
          net, recoup or otherwise withhold or suspend or condition payment or
          performance of any obligation between it and the other party
          hereunder against any obligation between it and the other party under
          any other agreements. Section 6(e) shall be amended by deleting the
          following sentence: "The amount, if any, payable in respect of an
          Early Termination Date and determined pursuant to this Section will
          be subject to any Set-off.".

(k)       Amendment. Notwithstanding any provision to the contrary in this
          Agreement, no amendment of either this Agreement or any Transaction
          under this Agreement shall be permitted by either party unless each
          of the Rating Agencies has been provided prior written notice of the
          same and the Rating Agency Condition is satisfied with respect to
          S&P.

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(l)       Notice of Certain Events or Circumstances. Each Party agrees, upon
          learning of the occurrence or existence of any event or condition
          that constitutes (or that with the giving of notice or passage of
          time or both would constitute) an Event of Default or Termination
          Event with respect to such party, promptly to give the other Party
          and to each Rating Agency notice of such event or condition; provided
          that failure to provide notice of such event or condition pursuant to
          this Part 5(1) shall not constitute an Event of Default or a
          Termination Event.

(m)       Proceedings. No Relevant Entity shall institute against, or cause any
          other person to institute against, or join any other person in
          instituting against Party B, the Supplemental Interest Trust, or the
          trust formed pursuant to the Pooling and Servicing Agreement, in any
          bankruptcy, reorganization, arrangement, insolvency or liquidation
          proceedings or other proceedings under any federal or state
          bankruptcy or similar law for a period of one year (or, if longer,
          the applicable preference period) and one day following payment in
          full of the Certificates and any Notes. This provision will survive
          the termination of this Agreement.

(n)       Supplemental Interest Trust Trustee Liability Limitations. It is
          expressly understood and agreed by the parties hereto that (a) this
          any such documentation is executed and delivered by Deutsche Bank
          National Trust Company ("DBNTC") not in its individual capacity, but
          solely as Supplemental Interest Trust Trustee under the Pooling and
          Servicing Agreement in the exercise of the powers and authority
          conferred and invested in it thereunder; (b) DBNTC has been directed
          pursuant to the Pooling and Servicing Agreement to enter into this
          Agreement and to perform its obligations hereunder; (c) each of the
          representations, warranties, covenants, undertakings and agreements
          herein made on behalf of the Supplemental Interest Trust is made and
          intended not as a personal representation of DBNTC but is made and
          intended for the purpose of binding only the Supplemental Interest
          Trust; and (d) nothing herein contained shall be construed as
          creating any liability on DBNTC, individually or personally, to
          perform any covenant either expressed or implied contained herein,
          (including, for the avoidance of doubt, any liability, individually
          or personally, for any failure or delay in making a payment
          hereunder to Party A due to any failure or delay in receiving
          amounts held in the account held by the Supplemental Interest Trust
          created pursuant to the Pooling and Servicing Agreement or any
          inability to provide any correct withholding certificate from a
          Certificateholder provided to the Supplemental Interest Trust
          Trustee) all such liability, if any, being expressly waived by the
          parties who are signatories to this Agreement and by any person
          claiming by, through or under such parties and (e) under no
          circumstances shall DBNTC in its individual capacity be personally
          liable for the payment of any indemnity, indebtedness, fees or
          expenses of the Supplemental Interest Trust or any payments
          hereunder or for the breach or failure of any obligation,
          representation, warranty or covenant made or undertaken under this
          Agreement or any other related documents, as to all of which
          recourse shall be had solely to the assets of the Supplemental
          Interest Trust in accordance with the terms of the Pooling and
          Servicing Agreement.

(o)       Severability. If any term, provision, covenant, or condition of this
          Agreement, or the application thereof to any party or circumstance,
          shall be held to be invalid or unenforceable (in whole or in part)
          in any respect, the remaining terms, provisions, covenants, and
          conditions hereof shall continue in full force and effect as if this
          Agreement had been executed with the invalid or unenforceable
          portion eliminated, so long as this Agreement as so modified
          continues to express, without material change, the original
          intentions of the parties as to the subject matter of this Agreement
          and the deletion of such portion of this Agreement will not
          substantially impair the respective benefits or expectations of the
          parties; provided, however, that this severability provision shall
          not be applicable if any provision of Section 2, 5, 6, or 13 (or any
          definition or provision in Section 14 to the extent it relates to,
          or is used in or in connection with any such Section) shall be so
          held to be invalid or unenforceable.

          The parties shall endeavor to engage in good faith negotiations to
          replace any invalid or unenforceable term, provision, covenant or
          condition with a valid or enforceable term, provision, covenant or
          condition, the economic effect of which comes as close as possible to
          that of the invalid or unenforceable term, provision, covenant or
          condition.

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(p)       Agent B. Party A acknowledges that the Depositor has appointed the
          Supplemental Interest Trust Trustee as agent under the Pooling and
          Servicing Agreement to carry out certain functions on behalf of Party
          B, and that the Supplemental Interest Trust Trustee shall be entitled
          to give notices and to perform and satisfy the obligations of Party B
          hereunder on behalf of Party B.

(q)       [Reserved.]

(r)       Consent to Recording. Each party hereto consents to the monitoring or
          recording, at any time and from time to time, by the other party of
          any and all communications between trading, marketing, and operations
          personnel of the parties and their Affiliates, waives any further
          notice of such monitoring or recording, and agrees to notify such
          personnel of such monitoring or recording. Each party agrees to
          provide such recording to the other party upon reasonable request.

(s)       Waiver of Jury Trial. Each party waives any right it may have to a
          trial by jury in respect of any suit, action or proceeding relating
          to this Agreement or any Credit Support Document.

(t)       Form of ISDA Master Agreement. Party A and Party B hereby agree that
          the text of the body of the ISDA Master Agreement is intended to be
          the printed form of the ISDA Master Agreement (Multicurrency -
          Crossborder) as published and copyrighted in 1992 by the
          International Swaps and Derivatives Association, Inc.

(u)       Payment Instructions. Party A hereby agrees that, unless notified in
          writing by Party B of other payment instructions, any and all amounts
          payable by Party A to Party B under this Agreement shall be paid to
          the account specified in Item 4 of this Long-form Confirmation,
          below.

(v)       Additional representations.

          (i)  Representations of Party A. Party A represents to Party B on
               the date on which Party A enters into each Transaction that:

               (1)  Party A's obligations under this Agreement rank pari passu
                    with all of Party A's other unsecured, unsubordinated
                    obligations except those obligations preferred by
                    operation of law.

          (ii) Capacity. Party A represents to Party B on the date on which
               Party A enters into this Agreement that it is entering into the
               Agreement and the Transaction as principal and not as agent of
               any person. The Supplemental Interest Trust Trustee represents
               to Party A on the date on which the Supplemental Interest Trust
               Trustee executes this Agreement that it is executing the
               Agreement in its capacity as Supplemental Interest
               Trust Trustee.

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(w)       Acknowledgements.

          (i)  Substantial financial transactions. Each party hereto is hereby
               advised and acknowledges as of the date hereof that the other
               party has engaged in (or refrained from engaging in)
               substantial financial transactions and has taken (or refrained
               from taking) other material actions in reliance upon the entry
               by the parties into the Transaction being entered into on the
               terms and conditions set forth herein and in the Pooling and
               Servicing Agreement relating to such Transaction, as
               applicable. This paragraph shall be deemed repeated on the
               trade date of each Transaction.

          (ii) Bankruptcy Code. Subject to Part 5(m), without limiting the
               applicability if any, of any other provision of the U.S.
               Bankruptcy Code as amended (the "Bankruptcy Code") (including
               without limitation Sections 362, 546, 556, and 560 thereof and
               the applicable definitions in Section 101 thereof), the parties
               acknowledge and agree that all Transactions entered into
               hereunder will constitute "forward contracts" or "swap
               agreements" as defined in Section 101 of the Bankruptcy Code or
               "commodity contracts" as defined in Section 761 of the
               Bankruptcy Code, that the rights of the parties under Section 6
               of this Agreement will constitute contractual rights to
               liquidate Transactions, that any margin or collateral provided
               under any margin, collateral, security, pledge, or similar
               agreement related hereto will constitute a "margin payment" as
               defined in Section 101 of the Bankruptcy Code, and that the
               parties are entities entitled to the rights under, and
               protections afforded by, Sections 362, 546, 556, and 560 of the
               Bankruptcy Code.

(x)       Limitation on Events of Default. Notwithstanding the provisions of
          Sections 5 and 6, with respect to any Transaction, if at any time
          and so long as Party B has satisfied in full all its payment
          obligations under Section 2(a)(i) in respect of this Transaction ( a
          "Cap Transaction") and has at the time no future payment
          obligations, whether absolute or contingent, under such Section in
          respect of such Cap Transaction, then unless Party A is required
          pursuant to appropriate proceedings to return to Party B or
          otherwise returns to Party B upon demand of Party B any portion of
          any such payment in respect of such Cap Transaction, (a) the
          occurrence of an event described in Section 5(a) with respect to
          Party B shall not constitute an Event of Default or Potential Event
          of Default with respect to Party B as Defaulting Party in respect of
          such Cap Transaction and (b) Party A shall be entitled to designate
          an Early Termination Date pursuant to Section 6 in respect of such
          Cap Transaction only as a result of the occurrence of a Termination
          Event set forth in either Section 5(b)(i) or 5(b)(ii) with respect
          to Party A as the Affected Party, or Section 5(b)(iii) with respect
          to Party A as the Burdened Party. For purposes of this Transaction,
          Party A acknowledges and agrees that Party B's only payment
          obligation under Section 2(a)(i) in respect of each Cap Transaction
          is to pay the related Fixed Amount on the related Fixed Amount Payer
          Payment Date.

(y)       [Reserved.]

(z)       Additional Definitions.

          As used in this Agreement, the following terms shall have the
          meanings set forth below, unless the context clearly requires
          otherwise:

          "Approved Ratings Threshold" means each of the S&P Approved Ratings
          Threshold and the Moody's First Trigger Ratings Threshold.

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          "Approved Replacement" means, with respect to a Market Quotation, an
          entity making such Market Quotation, which entity would satisfy
          conditions (a), (b), (c) and (d) of the definition of Permitted
          Transfer (as determined by Party B in its sole discretion, acting in
          a commercially reasonable manner) if such entity were a Transferee,
          as defined in the definition of Permitted Transfer.

          "Derivative Provider Trigger Event" means (i) an Event of Default
          with respect to which Party A is a Defaulting Party, (ii) a
          Termination Event with respect to which Party A is the sole Affected
          Party or (iii) an Additional Termination Event with respect to which
          Party A is the sole Affected Party.

          "Eligible Guarantee" means an unconditional and irrevocable
          guarantee of all present and future obligations of Party A under
          this Agreement (or, solely for purposes of the definition of
          Eligible Replacement, all present and future obligations of such
          Eligible Replacement under this Agreement or its replacement, as
          applicable) which is provided by a guarantor as principal debtor
          rather than surety and which is directly enforceable by Party B, the
          form and substance of which guarantee are subject to the Rating
          Agency Condition with respect to S&P and either (A) a law firm has
          given a legal opinion confirming that none of the guarantor's
          payments to Party B under such guarantee will be subject to
          deduction or Tax collected by withholding and such opinion has been
          delivered to Moody's, or (B) such guarantee provides that, in the
          event that any of such guarantor's payments to Party B are subject
          to deduction or Tax collected by withholding, such guarantor is
          required to pay such additional amount as is necessary to ensure
          that the net amount actually received by Party B (free and clear of
          any Tax collected by withholding) will equal the full amount Party B
          would have received had no such deduction or withholding been
          required, or (C) in the event that any payment under such guarantee
          is made net of deduction or withholding for Tax, Party A is
          required, under Section 2(a)(i), to make such additional payment as
          is necessary to ensure that the net amount actually received by
          Party B from the guarantor will equal the full amount Party B would
          have received had no such deduction or withholding been required.

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          "Eligible Replacement" means an entity (A) that lawfully could
          perform the obligations owing to Party B under this Agreement (or
          its replacement, as applicable), (B) (I) (x) which has credit
          ratings from S&P at least equal to the S&P Required Ratings
          Threshold or (y) all present and future obligations of which entity
          owing to Party B under this Agreement (or its replacement, as
          applicable) are guaranteed pursuant to an Eligible Guarantee
          provided by a guarantor with credit ratings from S&P at least equal
          to the S&P Required Ratings Threshold, in either case if S&P is a
          Rating Agency, and (II) (x) which has credit ratings from Moody's at
          least equal to the Moody's Second Trigger Ratings Threshold or (y)
          all present and future obligations of which entity owing to Party B
          under this Agreement (or its replacement, as applicable) are
          guaranteed pursuant to an Eligible Guarantee provided by a guarantor
          with credit ratings from Moody's at least equal to the Moody's
          Second Trigger Ratings Threshold, in either case if Moody's is a
          Rating Agency and (C) that has executed an Item 1115 Agreement with
          Depositor.

          "Financial Institution" means a bank, broker/dealer, insurance
          company, structured investment company or derivative product
          company.

          "Firm Offer" means a quotation from an Eligible Replacement (i) in
          an amount equal to the actual amount payable by or to Party B in
          consideration of an agreement between Party B and such Eligible
          Replacement to replace Party A as the counterparty to this Agreement
          by way of novation or, if such novation is not possible, an
          agreement between Party B and such Eligible Replacement to enter
          into a Replacement Transaction (assuming that all Transactions
          hereunder become Terminated Transactions), and (ii) that constitutes
          an offer by such Eligible Replacement to replace Party A as the
          counterparty to this Agreement or enter a Replacement Transaction
          that will become legally binding upon such Eligible Replacement upon
          acceptance by Party B.

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          "Moody's" means Moody's Investors Service, Inc., or any successor
          thereto.

          "Moody's First Trigger Ratings Threshold" means, with respect to
          Party A, the guarantor under an Eligible Guarantee, or an Eligible
          Replacement, (i) if such entity has a short-term unsecured and
          unsubordinated debt rating from Moody's, a long-term unsecured and
          unsubordinated debt rating or counterparty rating from Moody's of
          "A2" and a short-term unsecured and unsubordinated debt rating from
          Moody's of "Prime-1", or (ii) if such entity does not have a
          short-term unsecured and unsubordinated debt rating or counterparty
          rating from Moody's, a long-term unsecured and unsubordinated debt
          rating or counterparty rating from Moody's of "Al".

          "Moody's Second Trigger Downgrade Event" means that no Relevant
          Entity has credit ratings from Moody's at least equal to the Moody's
          Second Trigger Ratings Threshold.

          "Moody's Second Trigger Ratings Threshold" means, with respect to
          Party A, the guarantor under an Eligible Guarantee, or an Eligible
          Replacement, (i) if such entity has a short-term unsecured and
          unsubordinated debt rating from Moody's, a long-term unsecured and
          unsubordinated debt rating or counterparty rating from Moody's of
          "A3" and a short-term unsecured and unsubordinated debt rating from
          Moody's of "Prime-2", or (ii) if such entity does not have a
          short-term unsecured and unsubordinated debt rating from Moody's, a
          long-term unsecured and unsubordinated debt rating or counterparty
          rating from Moody's of "A3".

          "Permitted Transfer" means a transfer by novation by Party A,
          pursuant to Section 6(b)(ii) or the Item 1115 Agreement which is
          incorporated by reference pursuant to Part 5(e), or which is
          described in Sections 7(a)(2) or (3) (as amended herein), to a
          transferee (the "Transferee") of Party A's rights, liabilities,
          duties and obligations under this Agreement, with respect to which
          transfer each of the following conditions is satisfied: (a) the
          Transferee is an Eligible Replacement; (b) Party A and the
          Transferee are both "dealers in notional principal

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          contracts" within the meaning of Treasury regulations section
          1.1001-4; (c) as of the date of such transfer the Transferee would
          not be required to withhold or deduct on account of Tax from any
          payments under this Agreement or would be required to gross up for
          such Tax under Section 2(d)(i)(4); (d) an Event of Default or
          Termination Event would not occur as a result of such transfer; (e)
          the Transferee contracts with Party B pursuant to a written
          instrument (the "Transfer Agreement") (A) (i) on terms which are
          effective to transfer to the Transferee all, but not less than all,
          of Party A's rights, liabilities, duties and obligations under the
          Agreement and all relevant Transactions, which terms are identical
          to the terms of this Agreement, other than party names, dates
          relevant to the effective date of such transfer, tax representations
          (provided that the representations in Part 2(a)(i) are not modified)
          and any other representations regarding the status of the substitute
          counterparty of the type included in Part 5(b)(iv), Part 5(v)(i)(2)
          or Part 5(v)(ii), notice information and account details, and (ii)
          each Rating Agency has been given prior written notice of such
          transfer, or (B) (i) on terms that (x) have the effect of preserving
          for Party B the economic equivalent of all payment and delivery
          obligations (whether absolute or contingent and assuming the
          satisfaction of each applicable condition precedent) under this
          Agreement immediately before such transfer and (y) are, in all
          material respects, no less beneficial for Party B than the terms of
          this Agreement immediately before such transfer, as determined by
          Party B, and (ii) Moody's has been given prior written notice of
          such transfer and the Rating Agency Condition is satisfied with
          respect to S&P; (f) Party A will be responsible for any costs or
          expenses incurred in connection with such transfer (including any
          replacement cost of entering into a replacement transaction); and
          (g) such transfer otherwise complies with the terms of the Pooling
          and Servicing Agreement.

          "Rating Agency Condition" means, with respect to any particular
          proposed act or omission to act hereunder and each Rating Agency
          specified in connection with such proposed act or omission, that the
          party proposing such act or failure to act must consult with each of
          the specified Rating Agencies and receive from each such Rating
          Agency prior written confirmation that the proposed action or
          inaction would not cause a downgrade or withdrawal of the
          then-current rating of any Certificates or Notes.

<PAGE>

[LOGO OMITTED] Merrill Lynch

          "Rating Agencies" mean, with respect to any date of determination,
          each of S&P, and Moody's to the extent that each such rating agency
          is then providing a rating for any of the Mortgage Pass-Through
          Certificates Series 2007-FLX6 (the "Certificates") or any notes
          backed by any of the Certificates (the "Notes").

          "Relevant Entities" mean Party A and, to the extent applicable, a
          guarantor under an Eligible Guarantee.

          "Replacement Transaction" means, with respect to any Terminated
          Transaction or group of Terminated Transactions, a transaction or
          group of transactions that (A) has terms which would be effective to
          transfer to a transferee all, but not less than all, of Party A's
          rights, liabilities, duties and obligations under this Agreement and
          all relevant Transactions, which terms are identical to the terms of
          this Agreement, other than party names, dates relevant to the
          effective date of such transfer, tax representations (provided that
          the representations in Part 2(a)(i) are not modified) and any other
          representations regarding the status of the substitute counterparty
          of the type included in Part 5(b)(iv), Part 5(v)(i)(2) or Part
          5(v)(ii), notice information and account details, save for the
          exclusion of provisions relating to Transactions that are not
          Terminated Transactions, or (B) (x) would have the effect of
          preserving for Party B the economic equivalent of any payment or
          delivery (whether the underlying obligation was absolute or
          contingent and assuming the satisfaction of each applicable
          condition precedent) under this Agreement in respect of such
          Terminated Transaction or group of Terminated Transactions that
          would, but for the occurrence of the relevant Early Termination
          Date, have been required after that date, and (y) has terms which
          are, in all material respects, no less beneficial for Party B than
          those of this Agreement (save for the exclusion of provisions
          relating to Transactions that are not Terminated Transactions), as
          determined by Party B.

          "Required Ratings Downgrade Event" means that no Relevant Entity has
          credit ratings at least equal to the Required Ratings Threshold.

<PAGE>

[LOGO OMITTED] Merrill Lynch

          "Required Ratings Threshold" means each of the S&P Required Ratings
          Threshold and the Moody's Second Trigger Ratings Threshold

          "S&P" means Standard & Poor's Rating Services, a division of The
          McGraw-Hill Companies, Inc., or any successor thereto.

          "S&P Approved Ratings Threshold" means, with respect to Party A, the
          guarantor under an Eligible Guarantee, or an Eligible Replacement, a
          short-term unsecured and unsubordinated debt rating of "A-l" from
          S&P, or, if such entity does not have a short-term unsecured and
          unsubordinated debt rating from S&P, a long-term unsecured and
          unsubordinated debt rating or counterparty rating of "A+" from S&P.

          "S&P Required Ratings Downgrade Event" means that no Relevant Entity
          has credit ratings from S&P at least equal to the S&P Required
          Ratings Threshold.

          "S&P Required Ratings Threshold" means, with respect to Party A, the
          guarantor under an Eligible Guarantee, or an Eligible Replacement,
          (I) if such entity is a Financial Institution, a short-term
          unsecured and unsubordinated debt rating of "A-2" from S&P, or, if
          such entity does not have a short-term unsecured and unsubordinated
          debt rating from S&P, a long-term unsecured and unsubordinated debt
          rating or counterparty rating of "BBB+" from S&P, or (II) if such
          entity is not a Financial Institution, a short-term unsecured and
          unsubordinated debt rating of "A-1" from S&P, or, if such entity
          does not have a short-term unsecured and unsubordinated debt rating
          from S&P, a long-term unsecured and unsubordinated debt rating or
          counterparty rating of "A+" from S&P.

              [Remainder of this page intentionally left blank.]

<PAGE>

[LOGO OMITTED] Merrill Lynch

Item 4.   Account Details and Settlement Information:

Party A:    Deutsche Bank Trust Company Americas, New York, NY:021001003'

            FAO: Merrill Lynch Capital Services, Inc., New York, NY

            Acct:  00-811-874

Party B: Deutsche Bank Trust Co - Americas, New York, NY 10006

            ABA 021-001-033

            Account 01419663

            Name: NYLTD Funds Control-Stars West

            Re: IndyMac INDX Mortgage Loan Trust

            2007-FLX6 Cap Corridor Account

This Agreement may be executed in several counterparts, each of which shall be
deemed an original but all of which together shall constitute one and the same
instrument.

<PAGE>

[LOGO OMITTED] Merrill Lynch

We are very pleased to have executed this Transaction with you and we look
forward to completing other transactions with you in the near future.

Very truly yours,

MERRILL LYNCH CAPITAL SERVICES, INC. ("Party A")

By:      _____________________________________________
         Name:
         Title:

Party B, acting through its duly authorized signatory, hereby agrees to,
accepts and confirms the terms of the foregoing as of the date hereof.

DEUTSCHE BANK NATIONAL TRUST COMPANY, not in its individual capacity but
solely as Supplemental Interest Trustee on behalf of the Supplemental Interest
Trust with respect to INDYMAC INDX MORTGAGE LOAN TRUST 2007-FLX6, Mortgage
Pass-Through Certificates, Series 2007-FLX6 ("Party B")

By:      _____________________________________________
         Name:
         Title:

<PAGE>

[LOGO OMITTED] Merrill Lynch

<TABLE>
<CAPTION>
                                  SCHEDULE A

------------------------------------------------------------------------------------------------
                       Calculation Period
------------------------------------------------------------------------------------------------
                  From and               To but                   USD                  Cap
                  Including*           Excluding*           Notional Amount           Rate
------------------------------------------------------------------------------------------------
<S>              <C>                   <C>                  <C>                      <C>
     1           31-Jul-07              27-Aug-07           495,500,000.00           7.3810
------------------------------------------------------------------------------------------------
     2           27-Aug-07              25-Sep-07           484,809,422.30           5.8210
------------------------------------------------------------------------------------------------
     3           25-Sep-07              25-Oct-07           474,351,225.30           6.0380
------------------------------------------------------------------------------------------------
     4           25-Oct-07              26-Nov-07           464,120,281.60           5.8210
------------------------------------------------------------------------------------------------
     5           26-Nov-07              26-Dec-07           454,111,578.40           6.0380
------------------------------------------------------------------------------------------------
     6           26-Dec-07              25-Jan-08           444,320,215.10           5.8210
------------------------------------------------------------------------------------------------
     7           25-Jan-08              25-Feb-08           434,741,400.40           5.8210
------------------------------------------------------------------------------------------------
     8           25-Feb-08              25-Mar-08           425,370,450.20           6.2690
------------------------------------------------------------------------------------------------
     9           25-Mar-08              25-Apr-08           416,202,785.00           5.8210
------------------------------------------------------------------------------------------------
    10           25-Apr-08              27-May-08           407,233,927.40           6.0380
------------------------------------------------------------------------------------------------
    11           27-May-08              25-Jun-08           398,459,500.10           5.8210
------------------------------------------------------------------------------------------------
          *    Such dates being subject to adjustment in accordance with the
                  Modified Following Business Day Convention
------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

[LOGO OMITTED] Merrill Lynch

                                    Annex A

                   Paragraph 13 of the Credit Support Annex

<PAGE>

[LOGO OMITTED] Merrill Lynch

                                    Annex B

                              Item 1115 Agreement[LOGO OMITTED] [MERRILL LYNCH]

DATE:               July 30, 2007

AMENDED:            August 15, 2007

TO:                 DEUTSCHE BANK NATIONAL TRUST COMPANY, not in its individual
                    capacity but solely as Swap Trustee on behalf of the Swap
                    Trust with respect to INDYMAC INDX MORTGAGE LOAN TRUST
                    2007-FLX6, Mortgage Pass-Through Certificates, Series
                    2007-FLX6 ("Party B")

Attention:          TRUST ADMINISTRATIONIN07F6
Facsimile:          714-656-2626
Phone:              714-247-6000

FROM:               MERRILL LYNCH CAPITAL SERVICES, INC. ("Party A")

CONTACT:            THOMAS MOORE
EMAIL               thmoore@exchange.ml.com
TEL:                212.236.8657
FAX:                917.778.0836

SUBJECT:            Interest Rate Swap
REFERENCE NUMBER:   07DL21889, 3651763

THIS COMMUNICATION SUPERCEDES AND REPLACES ALL PRIOR COMMUNICATION BETWEEN THE
PARTIES HERETO WITH RESPECT TO THE TRANSACTION DESCRIBED BELOW.

The purpose of this long-form confirmation ("Long-form Confirmation") is to
confirm the terms and conditions of the current Transaction entered into on the
Trade Date specified below (the "Transaction") between Merrill Lynch Capital
Services, Inc. ("Party A") and Deutsche Bank National Trust Company, not
individually, but solely as swap trustee (the "Swap Trustee") on behalf of the
swap trust with respect to the IndyMac INDX Mortgage Loan Trust 2007-FLX6
Mortgage Pass-Through Certificates, Series 2007-FLX6 (the "Swap Trust") ("Party
B") created under the Pooling and Servicing Agreement, dated as of June 1, 2007,
among IndyMac MBS, Inc. as Depositor, IndyMac Bank, F.S.B. as Seller and
Servicer, Deutsche Bank National Trust Company as Trustee, Swap Trustee and
Supplemental Interest Trustee (the "Pooling and Servicing Agreement"). This
Long-form Confirmation evidences a complete and binding agreement between you
and us to enter into the Transaction on the terms set forth below and replaces
any previous agreement between us with respect to the subject matter hereof.
Item 2 of this Long-form Confirmation constitutes a "Confirmation" as referred
to in the ISDA Master Agreement (defined below); Item 3 of this Long-form
Confirmation constitutes a "Schedule" as referred to in the ISDA Master
Agreement; and Annex A hereto constitutes Paragraph 13 of a Credit Support Annex
to the Schedule.

Item 1.  The Confirmation set forth at Item 2 hereof shall supplement, form a
         part of, and be subject to an agreement in the form of the ISDA Master
         Agreement (Multicurrency - Cross Border) as published and copyrighted
         in 1992 by the International Swaps and Derivatives Association, Inc.
         (the "ISDA Master Agreement"), as if Party A and Party B had executed
         an agreement in such form on the date hereof, with a Schedule as set
         forth in Item 3 of this Long-form Confirmation, and an ISDA Credit
         Support Annex (Bilateral Form - ISDA Agreements Subject to New York Law
         Only version) as published and copyrighted in 1994 by the International
         Swaps and Derivatives Association, Inc., with Paragraph 13 thereof as
         set forth in Annex A hereto (the "Credit Support Annex"). For the
         avoidance of doubt, the Transaction described herein shall be the sole
         Transaction governed by such ISDA Master Agreement.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Item 2.  The terms of the particular Transaction to which this Confirmation
         relates are as follows:

         Type of Transaction:                        Interest Rate Swap

         Notional Amount:                            USD 1,370,829.14 subject to
                                                     amortization in accordance
                                                     with Schedule A, attached
                                                     hereto.

         Trade Date:                                 July 20, 2007

         Effective Date:                             July 25, 2008

         Termination Date:                           September 25, 2014, subject
                                                     to adjustment in accordance
                                                     with the Modified Business
                                                     Day Convention

         Additional Payment:                         USD 133,000.00 payable by
                                                     Party B to Party A on July
                                                     30, 2007

         Fixed Amounts:

                  Fixed Rate Payer:                  Party B

                  Fixed Rate Payer
                  Period End Dates:                  The 25th calendar day of
                                                     each month during the Term
                                                     of this Transaction,
                                                     commencing August 25, 2008,
                                                     and ending on the
                                                     Termination Date, Inclusive

                  Fixed Rate Payer
                  Payment Dates:                     The 25th calendar day of
                                                     each month during the Term
                                                     of this Transaction,
                                                     commencing August 25, 2008,
                                                     and ending on September 25,
                                                     2014, inclusive, subject to
                                                     adjustment in accordance
                                                     with the Modified Following
                                                     Business Day Convention,
                                                     and subject to Netting as
                                                     defined below under Other
                                                     Provisions

                  Fixed Amount Formula:              Notional Amount x Scale
                                                     Factor x 5.300000% x Fixed
                                                     Rate Day Count Fraction

                  Scale Factor:                      250

                  Fixed Rate Day
                  Count Fraction:                    Actual/360

                  No Adjustment to
                  Period End Date(s):                Applicable

         Floating Amounts:

                  Floating Rate Payer:               Party A

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                  Floating Rate Payer
                  Period End Dates:                  The 25th calendar day of
                                                     each month during the Term
                                                     of this Transaction,
                                                     commencing August 25, 2008,
                                                     and ending on September 25,
                                                     2014, inclusive, subject to
                                                     adjustment in accordance
                                                     with the Modified Following
                                                     Business Day Convention

                  Floating Rate Payer
                  Payment Dates:                     Two Business Days prior to
                                                     each Floating Rate Payer
                                                     Period End Date in each
                                                     month during the Term of
                                                     this Transaction,
                                                     commencing August 21, 2008,
                                                     and ending on the September
                                                     23, 2014, inclusive,
                                                     subject to adjustment in
                                                     accordance with the
                                                     Modified Following Business
                                                     Day Convention

                  Floating Rate Option:              USD-LIBOR-BBA

                  Floating Rate Amount:              Floating Rate Option x
                                                     Notional Amount x Scale
                                                     Factor x Floating Rate Day
                                                     Count Fraction

                  Designated Maturity:               One month

                  Spread:                            Inapplicable

                  Floating Rate Day
                  Count Fraction:                    Actual/360

                  No Adjustment of
                  Period End Date(s):                Inapplicable

                  Reset Dates:                       The first day of each
                                                     Floating Rate Calculation
                                                     Period.

                  Compounding:                       Inapplicable

                  Business Days:                     New York

         Other Provisions:                           Netting: With respect to
                                                     each Calculation Period, if
                                                     a Net Payment Amount for
                                                     such Calculation Period is
                                                     owed by Party A, then such
                                                     Net Payment Amount shall be
                                                     paid by Party A to Party B
                                                     on the related Floating
                                                     Rate Payer Payment Date,
                                                     and if a Net Payment Amount
                                                     for such Calculation Period
                                                     is owed by Party B, then
                                                     such Net Payment Amount
                                                     shall be paid by Party B to
                                                     Party A on the related
                                                     Fixed Rate Payer Payment
                                                     Date. "Net Payment Amount"
                                                     shall mean, for a
                                                     Calculation Period and a
                                                     party, the excess, if any,
                                                     of the aggregate amount
                                                     payable by such party in
                                                     respect of such Calculation
                                                     Period over the aggregate
                                                     amount payable by the other
                                                     party in respect of such
                                                     Calculation Period.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Item 3.  Provisions Deemed Incorporated in a Schedule to the ISDA Master
         Agreement:

Part 1.  Termination Provisions.

For the purposes of this Agreement:-

(a)   "Specified Entity" will not apply to Party A or Party B for any purpose.

(b)   "Specified Transaction" will have the meaning specified in Section 14.

(c)   Events of Default.

      The statement below that an Event of Default will apply to a specific
      party means that upon the occurrence of such an Event of Default with
      respect to such party, the other party shall have the rights of a
      Non-defaulting Party under Section 6 of this Agreement; conversely, the
      statement below that such event will not apply to a specific party means
      that the other party shall not have such rights.

      (i)   The "Failure to Pay or Deliver" provisions of Section 5(a)(i) will
            apply to Party A and will apply to Party B; provided, however, that
            Section 5(a)(i) is hereby amended by replacing the word "third" with
            the word "first"; provided, further, that notwithstanding anything
            to the contrary in Section 5(a)(i), any failure by Party A to comply
            with or perform any obligation to be complied with or performed by
            Party A under the Credit Support Annex shall not constitute an Event
            of Default under Section 5(a)(i) unless a Moody's Second Trigger
            Downgrade Event has occurred and is continuing and at least 30 Local
            Business Days have elapsed since such Moody's Second Trigger
            Downgrade Event first occurred.

      (ii)  The "Breach of Agreement" provisions of Section 5(a)(ii) will apply
            to Party A and will not apply to Party B.

      (iii) The "Credit Support Default" provisions of Section 5(a)(iii) will
            apply to Party A and will not apply to Party B except that Section
            5(a)(iii)(1) will apply to Party B solely in respect of Party B's
            obligations under Paragraph 3(b); provided, however, that
            notwithstanding anything to the contrary in Section 5(a)(iii)(1),
            any failure by Party A to comply with or perform any obligation to
            be complied with or performed by Party A under the Credit Support
            Annex shall not constitute an Event of Default under Section
            5(a)(iii) unless a Moody's Second Trigger Downgrade Event has
            occurred and is continuing and at least 30 Local Business Days have
            elapsed since such Moody's Second Trigger Downgrade Event first
            occurred.

      (iv)  The "Misrepresentation" provisions of Section 5(a)(iv) will apply to
            Party A and will not apply to Party B.

      (v)   The "Default under Specified Transaction" provisions of Section
            5(a)(v) will apply to Party A and will not apply to Party B.

      (vi)  The "Cross Default" provisions of Section 5(a)(vi) will apply to
            Party A and will not apply to Party B. For purposes of Section
            5(a)(vi), solely with respect to Party A:

      "Specified Indebtedness" will have the meaning specified in Section 14.

      "Threshold Amount" means with respect to Party A an amount equal to three
      percent (3%) of the shareholders' equity of Party A or, if applicable, a
      guarantor under an Eligible Guarantee with credit ratings at least equal
      to the S&P Required Ratings Threshold and the Moody's Second Trigger
      Threshold (as shown in the most recent annual audited financial statements
      of such entity determined in accordance with generally accepted accounting
      principles).

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      (vii) The "Bankruptcy" provisions of Section 5(a)(vii) will apply to Party
            A and will apply to Party B; provided, however, that, for purposes
            of applying Section 5(a)(vii) to Party B: (A) Section 5(a)(vii)(2)
            shall not apply, (B) Section 5(a)(vii)(3) shall not apply to any
            assignment, arrangement or composition that is effected by or
            pursuant to the Pooling and Servicing Agreement, (C) Section
            5(a)(vii)(4) shall not apply to a proceeding instituted, or a
            petition presented, by Party A or any of its Affiliates (for
            purposes of Section 5(a)(vii)(4), Affiliate shall have the meaning
            set forth in Section 14, notwithstanding anything to the contrary in
            this Agreement), (D) Section 5(a)(vii)(6) shall not apply to any
            appointment that is effected by or pursuant to the Pooling and
            Servicing Agreement, or any appointment to which Party B has not yet
            become subject; (E) Section 5(a)(vii) (7) shall not apply; (F)
            Section 5(a)(vii)(8) shall apply only to the extent of any event
            which has an effect analogous to any of the events specified in
            clauses (1), (3), (4), (5) or (6) of Section 5(a)(vii), in each case
            as modified in this Part 1(c)(vii), and (G) Section 5(a)(vii)(9)
            shall not apply.

     (viii) The "Merger Without Assumption" provisions of Section 5(a)(viii)
            will apply to Party A and will not apply to Party B.

(d)   Termination Events.

      The statement below that a Termination Event will apply to a specific
      party means that upon the occurrence of such a Termination Event, if such
      specific party is the Affected Party with respect to a Tax Event, the
      Burdened Party with respect to a Tax Event Upon Merger (except as noted
      below) or the non-Affected Party with respect to a Credit Event Upon
      Merger, as the case may be, such specific party shall have the right to
      designate an Early Termination Date in accordance with Section 6 of this
      Agreement; conversely, the statement below that such an event will not
      apply to a specific party means that such party shall not have such right;
      provided, however, with respect to "Illegality" the statement that such
      event will apply to a specific party means that upon the occurrence of
      such a Termination Event with respect to such party, either party shall
      have the right to designate an Early Termination Date in accordance with
      Section 6 of this Agreement.

      (i)   The "Illegality" provisions of Section 5(b)(i) will apply to Party A
            and will apply to Party B.

      (ii)  The "Tax Event" provisions of Section 5(b)(ii) will apply to Party A
            except that, for purposes of the application of Section 5(b)(ii) to
            Party A, Section 5(b)(ii) is hereby amended by deleting the words
            "(x) any action taken by a taxing authority, or brought in a court
            of competent jurisdiction, on or after the date on which a
            Transaction is entered into (regardless of whether such action is
            taken or brought with respect to a party to this Agreement) or (y)",
            and the "Tax Event" provisions of Section 5(b)(ii) will apply to
            Party B.

      (iii) The "Tax Event Upon Merger" provisions of Section 5(b)(iii) will
            apply to Party A and will apply to Party B, provided that Party A
            shall not be entitled to designate an Early Termination Date by
            reason of a Tax Event upon Merger in respect of which it is the
            Affected Party.

      (iv)  The "Credit Event Upon Merger" provisions of Section 5(b)(iv) will
            not apply to Party A and will not apply to Party B.

(e)   The "Automatic Early Termination" provision of Section 6(a) will not apply
      to Party A and will not apply to Party B.

(f)   Payments on Early Termination. For the purpose of Section 6(e) of this
      Agreement:

      (i)   Market Quotation will apply, provided, however, that,
            notwithstanding anything to the contrary in this Agreement, if an
            Early Termination Date has been designated as a result of a
            Derivative Provider Trigger Event, the following provisions will
            apply:

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

            (A)   The definition of Market Quotation in Section 14 shall be
                  deleted in its entirety and replaced with the following:

                  "Market Quotation" means, with respect to one or more
                  Terminated Transactions, a Firm Offer which is (1) made by an
                  Eligible Replacement, (2) for an amount that would be paid to
                  Party B (expressed as a negative number) or by Party B
                  (expressed as a positive number) in consideration of an
                  agreement between Party B and such Eligible Replacement to
                  enter into a Replacement Transaction, and (3) made on the
                  basis that Unpaid Amounts in respect of the Terminated
                  Transaction or group of Transactions are to be excluded but,
                  without limitation, any payment or delivery that would, but
                  for the relevant Early Termination Date, have been required
                  (assuming satisfaction of each applicable condition precedent)
                  after that Early Termination Date is to be included.

            (B)   The definition of Settlement Amount shall be deleted in its
                  entirety and replaced with the following:

                  "Settlement Amount" means, with respect to any Early
                  Termination Date, an amount (as determined by Party B) equal
                  to:

                  (a)   if, on or prior to such Early Termination Date, a Market
                        Quotation for the relevant Terminated Transaction or
                        group of Terminated Transactions is accepted by Party B
                        so as to become legally binding, the Termination
                        Currency Equivalent of the amount (whether positive or
                        negative) of such Market Quotation;

                  (b)   if, on such Early Termination Date, no Market Quotation
                        for the relevant Terminated Transaction or group of
                        Terminated Transactions has been accepted by Party B so
                        as to become legally binding and one or more Market
                        Quotations from Approved Replacements have been
                        communicated to Party B and remain capable of becoming
                        legally binding upon acceptance by Party B, the
                        Termination Currency Equivalent of the amount (whether
                        positive or negative) of the lowest of such Market
                        Quotations (for the avoidance of doubt, (I) a Market
                        Quotation expressed as a negative number is lower than a
                        Market Quotation expressed as a positive number and (II)
                        the lower of two Market Quotations expressed as negative
                        numbers is the one with the largest absolute value); or

                  (c)   if, on such Early Termination Date, no Market Quotation
                        for the relevant Terminated Transaction or group of
                        Terminated Transactions is accepted by Party B so as to
                        become legally binding and no Market Quotation from an
                        Approved Replacement has been communicated to Party B
                        and remains capable of becoming legally binding upon
                        acceptance by Party B, Party B's Loss (whether positive
                        or negative and without reference to any Unpaid Amounts)
                        for the relevant Terminated Transaction or group of
                        Terminated Transactions."

            (C)   If Party B requests Party A in writing to obtain Market
                  Quotations, Party A shall use its reasonable efforts to do so
                  before the Early Termination Date.

            (D)   If the Settlement Amount is a negative number, Section
                  6(e)(i)(3) shall be deleted in its entirety and replaced with
                  the following:

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                  "(3) Second Method and Market Quotation. If the Second Method
                  and Market Quotation apply, (I) Party B shall pay to Party A
                  an amount equal to the absolute value of the Settlement Amount
                  in respect of the Terminated Transactions, (II) Party B shall
                  pay to Party A the Termination Currency Equivalent of the
                  Unpaid Amounts owing to Party A and (III) Party A shall pay to
                  Party B the Termination Currency Equivalent of the Unpaid
                  Amounts owing to Party B; provided, however, that (x) the
                  amounts payable under the immediately preceding clauses (II)
                  and (III) shall be subject to netting in accordance with
                  Section 2(c) of this Agreement and (y) notwithstanding any
                  other provision of this Agreement, any amount payable by Party
                  A under the immediately preceding clause (III) shall not be
                  netted against any amount payable by Party B under the
                  immediately preceding clause (I)."

            (E)   At any time on or before the Early Termination Date at which
                  two or more Market Quotations from Approved Replacements have
                  been communicated to Party B and remain capable of becoming
                  legally binding upon acceptance by Party B, Party B shall be
                  entitled to accept only the lowest of such Market Quotations
                  (for the avoidance of doubt, (I) a Market Quotation expressed
                  as a negative number is lower than a Market Quotation
                  expressed as a positive number and (II) the lower of two
                  Market Quotations expressed as negative numbers is the one
                  with the largest absolute value).

            (F)   In determining whether or not a Firm Offer satisfies clause
                  (B)(y) of the definition of Replacement Transaction and
                  whether or not a proposed transfer satisfies clause (e)(B)(y)
                  of the definition of Permitted Transfer, Party B shall act in
                  a commercially reasonable manner.

      (ii)  The Second Method will apply.

(g)   "Termination Currency" means USD.

(h)   Additional Termination Events. Additional Termination Events will apply as
      provided in Part 5(c).

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Part 2. Tax Matters.

(a)   Tax Representations.

      (i)   Payer Representations. For the purpose of Section 3(e) of this
            Agreement:

            (A)   Party A makes the following representation:

                  It is not required by any applicable law, as modified by the
                  practice of any relevant governmental revenue authority, of
                  any Relevant Jurisdiction to make any deduction or withholding
                  for or on account of any Tax from any payment (other than
                  interest under Section 2(e), 6(d)(ii) or 6(e) of this
                  Agreement) to be made by it to the other party under this
                  Agreement. In making this representation, it may rely on: the
                  accuracy of any representations made by the other party
                  pursuant to Section 3(f) of this Agreement; (ii) the
                  satisfaction of the agreement contained in Section 4(a)(i) or
                  4(a)(iii) of this Agreement and the accuracy and effectiveness
                  of any document provided by the other party pursuant to
                  Section 4(a)(i) or 4(a)(iii) of this Agreement; and (iii) the
                  satisfaction of the agreement of the other party contained in
                  Section 4(d) of this Agreement, provided that it shall not be
                  a breach of this representation where reliance is placed on
                  clause (ii) and the other party does not deliver a form or
                  document under Section 4(a)(iii) by reason of material
                  prejudice to its legal or commercial position.

                  Party B: None

      (ii)  Payee Representations. For the purpose of Section 3(f) of this
            Agreement:

            (A)   Party A makes the following representation(s):

                  Party A is a corporation organized under the laws of the State
                  of Delaware.

            (B)   Party B makes the following representation(s): None

(b)   Tax Provisions.

      (i)   Gross Up. Section 2(d)(i)(4) shall not apply to Party B as X, and
            Section 2(d)(ii) shall not apply to Party B as Y, in each case such
            that Party B shall not be required to pay any additional amounts
            referred to therein.

      (ii)  Indemnifiable Tax. The definition of "Indemnifiable Tax" in Section
            14 is deleted in its entirety and replaced with the following:

            "Indemnifiable Tax" means, in relation to payments by Party A, any
            Tax and, in relation to payments by Party B, no Tax.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Part 3. Agreement to Deliver Documents.

(a)   For the purpose of Section 4(a)(i), tax forms, documents, or certificates
      to be delivered are:

<TABLE>
<CAPTION>
Party required to deliver   Form/Document/                                       Date by which to
document                    Certificate                                          be delivered
<S>                         <C>                                                  <C>
Party A                     An original properly completed and executed          (i) upon execution of this Agreement, (ii) on
                            United States Internal Revenue Service Form W-9      or before the first payment date under this
                            (or any successor thereto) with respect to any       Agreement, including any Credit Support
                            payments received or to be received by Party A       Document, (iii) promptly upon the reasonable
                            that eliminates U.S. federal withholding and         demand by Party B, (iv) prior to the expiration
                            backup withholding Tax on payments to Party A        or obsolescence of any previously delivered
                            under this Agreement.                                form, and (v) promptly upon the information on
                                                                                 any such previously delivered form becoming
                                                                                 inaccurate or incorrect.

Party B                     (i) Upon execution of this Agreement, an executed    (i) upon execution of this Agreement, (ii) on
                            United States Internal Revenue Service Form W-[9]    or before the first payment date under this
                            [8BEN] [8ECI] [8IMY including applicable             Agreement, including any Credit Support
                            attachments] (or any successor thereto) with         Document, (iii) in the case of a tax
                            respect to any payments received or to be            certification form other than a Form W-9,
                            received by the initial beneficial owner of          before December 31 of each third succeeding
                            payments to Party B under this Agreement, and        calendar year, (iv) promptly upon the
                            (ii) thereafter,  the appropriate tax                reasonable demand by Party B, (v) prior to the
                            certification form (i.e., IRS Form W-9 or IRS        expiration or obsolescence of any previously
                            Form W-8BEN, W-8IMY, W-8EXP or W-8ECI, as            delivered form, and (vi) promptly upon
                            applicable (or any successor form thereto)) with     knowledge that the information on any such
                            respect to any payments received or to be            previously delivered form becoming inaccurate
                            received by the beneficial owner of payments to      or incorrect.
                            Party B under this Agreement from time to time.
</TABLE>

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

(b)   For the purpose of Section 4(a)(ii), other documents to be delivered are:

<TABLE>
<CAPTION>
Party required to    Form/Document/                                      Date by which to                      Covered by Section
deliver document     Certificate                                         be delivered                          3(d) Representation
<S>                  <C>                                                 <C>                                   <C>
Party A and          Any documents required by the receiving party to    Upon the execution and delivery of    Yes
Party B              evidence the authority of the delivering party or   this Agreement
                     its Credit Support Provider, if any, for it to
                     execute and deliver the Agreement, each
                     Confirmation, and any Credit Support Documents to
                     which it is a party, and to evidence the authority
                     of the delivering party or its Credit Support
                     Provider to perform its obligations under the
                     Agreement, each Confirmation and any Credit
                     Support Document, as the case may be

Party A and          A certificate of an authorized officer of the       Upon the execution and delivery of    Yes
Party B              party, as to the incumbency and authority of the    this Agreement
                     respective officers of the party signing the
                     Agreement, each  Confirmation, and any relevant
                     Credit Support Document, as the case may be

Party A              Annual Report of Party A containing consolidated    Promptly upon becoming publicly       Yes
                     financial statements certified by independent       available
                     certified public accountants and prepared in
                     accordance with generally accepted accounting
                     principles in the country in which Party A is
                     organized

Party A              Quarterly Financial Statements of Party A           Promptly upon becoming publicly       Yes
                     containing unaudited, consolidated financial        available
                     statements of Party A's fiscal quarter prepared
                     in accordance with generally accepted accounting
                     principles in the country in which Party A is
                     organized

Party A              An opinion of counsel to Party A reasonably         Upon the execution and delivery of    No
                     acceptable to Party B.                              this Agreement

Party A              A guarantee of Merrill Lynch & Co., Inc.            Upon the execution and delivery of    No
                                                                         this Agreement

Party A              An opinion of counsel to Party A's Guarantor        Upon the execution and delivery of    No
                     reasonably acceptable to Party B                    this Agreement
</TABLE>

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Part 4.  Miscellaneous.

(a)   Address for Notices: For the purposes of Section 12(a) of this Agreement:

      Address for notices or communications to Party A:

      Address:          Merrill Lynch World Headquarters
                        4 World Financial Center, 18th Floor
                        New York, New York 10080
      Attention:        Swap Group
      Facsimile No.:    917-778-0836
      Telephone No.:    212-449-2467

      (For all purposes)

      Additionally, a copy of all notices pursuant to Sections 5, 6, and 7 as
      well as any changes to counterparty's address, telephone number or
      facsimile number should be sent to:

                        GMI Counsel
                        Merrill Lynch World Headquarters
                        4 World Financial Center, 12th Floor
                        New York, New York 10080
      Attention:        Swaps Legal
      Facsimile No.:    212-449-6993

      Address for notices or communications to Party B:

      Address:          IndyMac INDX Mortgage Loan Trust 2007-FLX6
                        c/o Deutsche Bank National Trust Company
                        1761 East St. Andrew Place
                        Santa Ana, CA 92705
      Attention:        Trust AdministrationIN07F6
      Facsimile:        714-656-2626
      Phone:            714-247-6000

      (For all purposes)

(b)   Process Agent. For the purpose of Section 13(c):

      Party A appoints as its Process Agent:  Not applicable.

      Party B appoints as its Process Agent:  Not applicable.

(c)   Offices. The provisions of Section 10(a) will apply to this Agreement;
      neither Party A nor Party B has any Offices other than as set forth in the
      Notices Section and Party A agrees that, for purposes of Section 6(b) of
      this Agreement, it shall not in the future have any Office other than one
      in the United States.

(d)   Multibranch Party. For the purpose of Section 10(c) of this Agreement:

      Party A is not a Multibranch Party.

      Party B is not a Multibranch Party.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

(e)   Calculation Agent. The Calculation Agent is Party A; provided, however,
      that if an Event of Default shall have occurred with respect to Party A,
      Party B shall have the right to appoint as Calculation Agent a financial
      institution which would qualify as a Reference Market-maker, reasonably
      acceptable to Party A, the cost for which shall be borne by Party A.

(f)   Credit Support Document.

      Party A:          The Credit Support Annex, and any guarantee in support
                        of Party A's obligations under this Agreement.

      Party B:          The Credit Support Annex, solely in respect of Party B's
                        obligations under Paragraph 3(b) of the Credit Support
                        Annex.

(g)   Credit Support Provider.

      Party A:          The guarantor under any guarantee in support of Party
                        A's obligations under this Agreement.

      Party B:          None.

(h)   Governing Law. The parties to this Agreement hereby agree that the law of
      the State of New York shall govern their rights and duties in whole
      (including any claim or controversy arising out of or relating to this
      Agreement), without regard to the conflict of law provisions thereof other
      than New York General Obligations Law Sections 5-1401 and 5-1402.

(i)   Netting of Payments. Subparagraph (ii) of Section 2(c) will apply to each
      Transaction hereunder.

(j)   Affiliate. "Affiliate" shall have the meaning assigned thereto in Section
      14; provided, however, that Party B shall be deemed to have no Affiliates
      for purposes of this Agreement, including for purposes of Section
      6(b)(ii).

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Part 5. Other Provisions.

(a)   Definitions. Unless otherwise specified in a Confirmation, this Agreement
      and each Transaction under this Agreement are subject to the 2000 ISDA
      Definitions as published and copyrighted in 2000 by the International
      Swaps and Derivatives Association, Inc. (the "Definitions"), and will be
      governed in all relevant respects by the provisions set forth in the
      Definitions, without regard to any amendment to the Definitions subsequent
      to the date hereof. The provisions of the Definitions are hereby
      incorporated by reference in and shall be deemed a part of this Agreement,
      except that (i) references in the Definitions to a "Swap Transaction"
      shall be deemed references to a "Transaction" for purposes of this
      Agreement, and (ii) references to a "Transaction" in this Agreement shall
      be deemed references to a "Swap Transaction" for purposes of the
      Definitions. Each term capitalized but not defined in this Agreement shall
      have the meaning assigned thereto in the Pooling and Servicing Agreement.

      Each reference herein to a "Section" (unless specifically referencing the
      Pooling and Servicing Agreement) or to a "Section" "of this Agreement"
      will be construed as a reference to a Section of the ISDA Master
      Agreement; each herein reference to a "Part" will be construed as a
      reference to the Schedule to the ISDA Master Agreement; each reference
      herein to a "Paragraph" will be construed as a reference to a Paragraph of
      the Credit Support Annex.

(b)   Amendments to ISDA Master Agreement.

      (i)   Single Agreement. Section 1(c) is hereby amended by the adding the
            words "including, for the avoidance of doubt, the Credit Support
            Annex" after the words "Master Agreement".

      (ii)  Conditions Precedent. Section 2(a)(iii) is hereby amended by adding
            the following at the end thereof:

            Notwithstanding anything to the contrary in Section 2(a)(iii)(1), if
            an Event of Default with respect to Party B or Potential Event of
            Default with respect to Party B has occurred and been continuing for
            more than 30 Local Business Days and no Early Termination Date in
            respect of the Affected Transactions has occurred or been
            effectively designated by Party A, the obligations of Party A under
            Section 2(a)(i) shall cease to be subject to the condition precedent
            set forth in Section 2(a)(iii)(1) with respect to such specific
            occurrence of such Event of Default or such Potential Event of
            Default (the "Specific Event"); provided, however, for the avoidance
            of doubt, the obligations of Party A under Section 2(a)(i) shall be
            subject to the condition precedent set forth in Section 2(a)(iii)(1)
            (subject to the foregoing) with respect to any subsequent occurrence
            of the same Event of Default with respect to Party B or Potential
            Event of Default with respect to Party B after the Specific Event
            has ceased to be continuing and with respect to any occurrence of
            any other Event of Default with respect to Party B or Potential
            Event of Default with respect to Party B that occurs subsequent to
            the Specific Event.

      (iii) Change of Account. Section 2(b) is hereby amended by the addition of
            the following after the word "delivery" in the first line thereof:
            "to another account in the same legal and tax jurisdiction as the
            original account".

      (iv)  Representations. Section 3 is hereby amended by adding at the end
            thereof the following subsection (g):

            "(g)  Relationship Between Parties.

                  (1)   Nonreliance. (i) It is not relying on any statement or
                        representation of the other party (whether written or
                        oral) regarding any Transaction hereunder, other than
                        the representations expressly made in this Agreement or
                        the Confirmation in respect of that Transaction and (ii)
                        it has consulted with its own legal, regulatory, tax,
                        business, investment, financial and accounting advisors
                        to the extent it has deemed necessary, and it has made
                        its own investment, hedging and trading decisions based
                        upon its

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                        own judgment and upon any advice from such advisors as
                        it has deemed necessary and not upon any view expressed
                        by the other party.

                  (2)   Evaluation and Understanding. (i) It has the capacity to
                        evaluate (internally or through independent professional
                        advice) each Transaction and has made its own decision
                        to enter into the Transaction and (ii) it understands
                        the terms, conditions and risks of the Transaction and
                        is willing and able to accept those terms and conditions
                        and to assume those risks, financially and otherwise.

                  (3)   Purpose. It is entering into the Transaction for the
                        purposes of managing its borrowings or investments,
                        hedging its underlying assets or liabilities or in
                        connection with a line of business.

                  (4)   Status of Parties. The other party is not acting as an
                        agent, fiduciary or advisor for it in respect of the
                        Transaction.

                  (5)   Eligible Contract Participant. It is an "eligible swap
                        participant" as such term is defined in, Section
                        35.1(b)(2) of the regulations (17 C.F.R. 35) promulgated
                        under, and an "eligible contract participant" as defined
                        in Section 1(a)(12) of the Commodity Exchange Act, as
                        amended."

      (v)   Transfer to Avoid Termination Event. Section 6(b)(ii) is hereby
            amended (i) by deleting the words "or if a Tax Event Upon Merger
            occurs and the Burdened Party is the Affected Party," and the words
            ", which consent will not be withheld if such other party's policies
            in effect at such time would permit it to enter into transactions
            with the transferee on the terms proposed"and (ii) by deleting the
            words "to transfer" and inserting the words "to effect a Permitted
            Transfer" in lieu thereof.

      (vi)  Jurisdiction. Section 13(b) is hereby amended by: (i) deleting in
            the second line of subparagraph (i) thereof the word "non-", (ii)
            deleting "; and" from the end of subparagraph (i) and inserting "."
            in lieu thereof, and (iii) deleting the final paragraph thereof.

      (vii) Local Business Day. The definition of Local Business Day in Section
            14 is hereby amended by the addition of the words "or any Credit
            Support Document" after "Section 2(a)(i)" and the addition of the
            words "or Credit Support Document" after "Confirmation".

(c)   Additional Termination Events. The following Additional Termination Events
      will apply:

      (i)   Failure to Post Collateral. If Party A has failed to comply with or
            perform any obligation to be complied with or performed by Party A
            in accordance with the Credit Support Annex and such failure has not
            given rise to an Event of Default under Section 5(a)(i) or Section
            5(a)(iii), then an Additional Termination Event shall have occurred
            with respect to Party A and Party A shall be the sole Affected Party
            with respect to such Additional Termination Event.

      (ii)  Second Rating Trigger Replacement. The occurrence of any event
            described in this Part 5(c)(ii) shall constitute an Additional
            Termination Event with respect to Party A and Party A shall be the
            sole Affected Party with respect to such Additional Termination
            Event.

            (A)   A Moody's Second Trigger Downgrade Event has occurred and is
                  continuing and at least 30 Local Business Days have elapsed
                  since such Moody's Second Trigger Downgrade Event first
                  occurred, and at least one Eligible Replacement has made a
                  Firm Offer that would, assuming the occurrence of an Early
                  Termination Date, qualify as a Market Quotation (on the basis
                  that Part 1(f)(i)(A) applies) and which remains capable of
                  becoming legally binding upon acceptance.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

            (B)   An S&P Required Ratings Downgrade Event has occurred and is
                  continuing and at least 60 calendar days have elapsed since
                  such S&P Required Ratings Downgrade Event first occurred.

      (iii) Amendment of Pooling and Servicing Agreement. If, without the prior
            written consent of Party A where such consent is required under the
            Pooling and Servicing Agreement (such consent not to be unreasonably
            withheld, conditioned or delayed), an amendment is made to the
            Pooling and Servicing Agreement which amendment could reasonably be
            expected to have a material adverse effect on the interests of Party
            A (excluding, for the avoidance of doubt, any amendment to the
            Pooling and Servicing Agreement that is entered into solely for the
            purpose of appointing a successor servicer, master servicer,
            securities administrator, trustee or other service provider) under
            this Agreement, an Additional Termination Event shall have occurred
            with respect to Party B and Party B shall be the sole Affected Party
            with respect to such Additional Termination Event.

      (iv)  [Reserved.]

      (v)   [Reserved.]

      (vi)  Optional Termination of Securitization. An Additional Termination
            Event shall occur upon the notice to Certificateholders of an
            Optional Termination becoming unrescindable in accordance with
            Article 9 of the Pooling and Servicing Agreement (such notice, the
            "Optional Termination Notice"). With respect to such Additional
            Termination Event: (A) Party B shall be the sole Affected Party; (B)
            notwithstanding anything to the contrary in Section 6(b)(iv) or
            Section 6(c)(i), the final Distribution Date specified in the
            Optional Termination Notice is hereby designated as the Early
            Termination Date for this Additional Termination Event in respect of
            all Affected Transactions; (C) Section 2(a)(iii)(2) shall not be
            applicable to any Affected Transaction in connection with the Early
            Termination Date resulting from this Additional Termination Event;
            notwithstanding anything to the contrary in Section 6(c)(ii),
            payments and deliveries under Section 2(a)(i) or Section 2(e) in
            respect of the Terminated Transactions resulting from this
            Additional Termination Event will be required to be made through and
            including the Early Termination Date designated as a result of this
            Additional Termination Event; provided, for the avoidance of doubt,
            that any such payments or deliveries that are made on or prior to
            such Early Termination Date will not be treated as Unpaid Amounts in
            determining the amount payable in respect of such Early Termination
            Date; (D) notwithstanding anything to the contrary in Section
            6(d)(i), (I) if, no later than 4:00 pm New York City time on the day
            that is four Business Days prior to the final Distribution Date
            specified in the Optional Termination Notice, the Servicer requests
            the amount of the Estimated Swap Termination Payment, Party A shall
            provide to the Servicer in writing (which may be done in electronic
            format) the amount of the Estimated Swap Termination Payment no
            later than 2:00 pm New York City time on the following Business Day
            and (II) if the Servicer provides written notice (which may be done
            in electronic format) to Party A no later than two Business Days
            prior to the final Distribution Date specified in the Optional
            Termination Notice that all requirements of the Optional Termination
            have been met, then Party A shall, no later than one Business Day
            prior to the final Distribution Date specified in the Optional
            Termination Notice, make the calculations contemplated by Section
            6(e) (as amended herein) and provide to the Servicer in writing
            (which may be done in electronic format) the amount payable by
            either Party B or Party A in respect of the related Early
            Termination Date in connection with this Additional Termination
            Event; provided, however, that the amount payable by Party B, if
            any, in respect of the related Early Termination Date shall be the
            lesser of (x) the amount calculated to be due from Party B pursuant
            to

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

            Section 6(e) and (y) the Estimated Swap Termination Payment; and (E)
            notwithstanding anything to the contrary in this Agreement, any
            amount due from Party B to Party A in respect of this Additional
            Termination Event will be payable on the final Distribution Date
            specified in the Optional Termination Notice and any amount due from
            Party A to Party B in respect of this Additional Termination Event
            will be payable one Business Day prior to the final Distribution
            Date specified in the Optional Termination Notice.

            The Servicer shall be an express third party beneficiary of this
            Agreement as if a party hereto to the extent of the Servicer's
            rights specified herein.

(d)   Required Ratings Downgrade Event. If a Required Ratings Downgrade Event
      has occurred and is continuing, then Party A shall, at its own expense,
      use commercially reasonable efforts to, as soon as reasonably practicable,
      either (A) effect a Permitted Transfer or (B) procure an Eligible
      Guarantee by a guarantor with credit ratings at least equal to the S&P
      Required Ratings Threshold and the Moody's Second Trigger Threshold.

(e)   Compliance with Item 1115 of Regulation AB.

      Party A and Party B hereby agree that the terms of the Item 1115
      Agreement, dated as of June 29, 2006 (the "Item 1115 Agreement"), among
      IndyMac Bank, F.S.B., IndyMac MBS, Inc., IndyMac ABS, Inc. and Party A
      shall be incorporated by reference into this Agreement and Party B shall
      be an express third party beneficiary of the Item 1115 Agreement. A copy
      of the Item 1115 Agreement is annexed hereto at Annex B

(f)   Transfers.

      (i)   Section 7 is hereby amended to read in its entirety as follows:

            "Neither this Agreement nor any interest or obligation in or under
            this Agreement may be transferred (whether by way of security or
            otherwise) by either party unless (a) the prior written consent of
            the other party is obtained and (b) the Rating Agency Condition has
            been satisfied with respect to S&P except that:

            (a)   Party A may make a Permitted Transfer (1) pursuant to Section
                  6(b)(ii) or the Item 1115 Agreement incorporated by reference
                  pursuant to Part 5(e) above, (2) pursuant to a consolidation
                  or amalgamation with, or merger with or into, or transfer of
                  all or substantially all its assets to, another entity (but
                  without prejudice to any other right or remedy under this
                  Agreement), or (3) at any time at which no Relevant Entity has
                  credit ratings at least equal to the Approved Ratings
                  Threshold;

            (b)   Party B may transfer its rights and obligations hereunder in
                  connection with a transfer pursuant to Section 8.09 of the
                  Pooling and Servicing Agreement, and

            (c)   a party may make such a transfer of all or any part of its
                  interest in any amount payable to it from a Defaulting Party
                  under Section 6(e).

            Any purported transfer that is not in compliance with this Section
            will be void.

      (ii)  If an Eligible Replacement has made a Firm Offer (which remains an
            offer that will become legally binding upon acceptance by Party B)
            to be the transferee pursuant to a Permitted Transfer, Party B
            shall, at Party A's written request and at Party A's expense, take
            any reasonable steps required to be taken by Party B to effect such
            transfer.

(g)   Non-Recourse. Party A acknowledges and agrees that, notwithstanding any
      provision in this Agreement to the contrary, the obligations of Party B
      hereunder are limited recourse obligations of Party B, payable solely from

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      the Swap Trust and the proceeds thereof, in accordance with the priority
      of payments and other terms of the Pooling and Servicing Agreement and
      that Party A will not have any recourse to any of the directors, officers,
      agents, employees, shareholders or affiliates of the Party B with respect
      to any claims, losses, damages, liabilities, indemnities or other
      obligations in connection with any transactions contemplated hereby. In
      the event that the Swap Trust and the proceeds thereof, should be
      insufficient to satisfy all claims outstanding and following the
      realization of the account held by the Swap Trust and the proceeds
      thereof, any claims against or obligations of Party B under the ISDA
      Master Agreement or any other confirmation thereunder still outstanding
      shall be extinguished and thereafter not revive. The Swap Trustee shall
      not have liability for any failure or delay in making a payment hereunder
      to Party A due to any failure or delay in receiving amounts in the account
      held by the Swap Trust from the Trust created pursuant to the Pooling and
      Servicing Agreement. This provision will survive the termination of this
      Agreement.

(h)   Timing of Payments by Party B upon Early Termination. Notwithstanding
      anything to the contrary in Section 6(d)(ii), to the extent that all or a
      portion (in either case, the "Unfunded Amount") of any amount that is
      calculated as being due in respect of any Early Termination Date under
      Section 6(e) from Party B to Party A will be paid by Party B from amounts
      other than any upfront payment paid to Party B by an Eligible Replacement
      that has entered into a Replacement Transaction with Party B, then such
      Unfunded Amount shall be due on the next subsequent Distribution Date
      following the date on which the payment would have been payable as
      determined in accordance with Section 6(d)(ii), and on any subsequent
      Distribution Dates until paid in full (or if such Early Termination Date
      is the final Distribution Date, on such final Distribution Date);
      provided, however, that if the date on which the payment would have been
      payable as determined in accordance with Section 6(d)(ii) is a
      Distribution Date, such payment will be payable on such Distribution Date.

(i)   Rating Agency Notifications. Notwithstanding any other provision of this
      Agreement, no Early Termination Date shall be effectively designated
      hereunder by Party B and no transfer of any rights or obligations under
      this Agreement shall be made by either party unless each Rating Agency has
      been provided prior written notice of such designation or transfer.

(j)   No Set-off. Except as expressly provided for in Section 2(c), Section 6 or
      Part 1(f)(i)(D) hereof, and notwithstanding any other provision of this
      Agreement or any other existing or future agreement, each party
      irrevocably waives any and all rights it may have to set off, net, recoup
      or otherwise withhold or suspend or condition payment or performance of
      any obligation between it and the other party hereunder against any
      obligation between it and the other party under any other agreements.
      Section 6(e) shall be amended by deleting the following sentence: "The
      amount, if any, payable in respect of an Early Termination Date and
      determined pursuant to this Section will be subject to any Set-off.".

(k)   Amendment. Notwithstanding any provision to the contrary in this
      Agreement, no amendment of either this Agreement or any Transaction under
      this Agreement shall be permitted by either party unless each of the
      Rating Agencies has been provided prior written notice of the same and the
      Rating Agency Condition is satisfied with respect to S&P.

(l)   Notice of Certain Events or Circumstances. Each Party agrees, upon
      learning of the occurrence or existence of any event or condition that
      constitutes (or that with the giving of notice or passage of time or both
      would constitute) an Event of Default or Termination Event with respect to
      such party, promptly to give the other Party and to each Rating Agency
      notice of such event or condition; provided that failure to provide notice
      of such event or condition pursuant to this Part 5(l) shall not constitute
      an Event of Default or a Termination Event.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

(m)   Proceedings. No Relevant Entity shall institute against, or cause any
      other person to institute against, or join any other person in instituting
      against Party B, the Swap Trust, or the trust formed pursuant to the
      Pooling and Servicing Agreement, in any bankruptcy, reorganization,
      arrangement, insolvency or liquidation proceedings or other proceedings
      under any federal or state bankruptcy or similar law for a period of one
      year (or, if longer, the applicable preference period) and one day
      following payment in full of the Certificates and any Notes. This
      provision will survive the termination of this Agreement.

(n)   Swap Trustee Liability Limitations. It is expressly understood and agreed
      by the parties hereto that (a) any such documentation is executed and
      delivered by Deutsche Bank National Trust Company ("DBNTC") not in its
      individual capacity, but solely as Swap Trustee under the Pooling and
      Servicing Agreement in the exercise of the powers and authority conferred
      and invested in it thereunder; (b) DBNTC has been directed pursuant to the
      Pooling and Servicing Agreement to enter into this Agreement and to
      perform its obligations hereunder; (c) each of the representations,
      warranties, covenants, undertakings and agreements herein made on behalf
      of the Swap Trust is made and intended not as a personal representation of
      DBNTC but is made and intended for the purpose of binding only the Swap
      Trust; and (d) nothing herein contained shall be construed as creating any
      liability on DBNTC, individually or personally, to perform any covenant
      either expressed or implied contained herein, (including, for the
      avoidance of doubt, any liability, individually or personally, for any
      failure or delay in making a payment hereunder to Party A due to any
      failure or delay in receiving amounts held in the account held by the Swap
      Trust created pursuant to the Pooling and Servicing Agreement or any
      inability to provide any correct withholding certificate from a
      Certificateholder provided to the Swap Trustee) all such liability, if
      any, being expressly waived by the parties who are signatories to this
      Agreement and by any person claiming by, through or under such parties and
      (e) under no circumstances shall DBNTC in its individual capacity be
      personally liable for the payment of any indemnity, indebtedness, fees or
      expenses of the Swap Trust or any payments hereunder or for the breach or
      failure of any obligation, representation, warranty or covenant made or
      undertaken under this Agreement or any other related documents, as to all
      of which recourse shall be had solely to the assets of the Swap Trust in
      accordance with the terms of the Pooling and Servicing Agreement.

(o)   Severability. If any term, provision, covenant, or condition of this
      Agreement, or the application thereof to any party or circumstance, shall
      be held to be invalid or unenforceable (in whole or in part) in any
      respect, the remaining terms, provisions, covenants, and conditions hereof
      shall continue in full force and effect as if this Agreement had been
      executed with the invalid or unenforceable portion eliminated, so long as
      this Agreement as so modified continues to express, without material
      change, the original intentions of the parties as to the subject matter of
      this Agreement and the deletion of such portion of this Agreement will not
      substantially impair the respective benefits or expectations of the
      parties; provided, however, that this severability provision shall not be
      applicable if any provision of Section 2, 5, 6, or 13 (or any definition
      or provision in Section 14 to the extent it relates to, or is used in or
      in connection with any such Section) shall be so held to be invalid or
      unenforceable.

      The parties shall endeavor to engage in good faith negotiations to replace
      any invalid or unenforceable term, provision, covenant or condition with a
      valid or enforceable term, provision, covenant or condition, the economic
      effect of which comes as close as possible to that of the invalid or
      unenforceable term, provision, covenant or condition.

(p)   Agent for Party B. Party A acknowledges that the Depositor has appointed
      the Swap Trustee as agent under the Pooling and Servicing Agreement to
      carry out certain functions on behalf of Party B, and that the Swap
      Trustee shall be entitled to give notices and to perform and satisfy the
      obligations of Party B hereunder on behalf of Party B.

(q)   [Reserved.]

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

(r)   Consent to Recording. Each party hereto consents to the monitoring or
      recording, at any time and from time to time, by the other party of any
      and all communications between trading, marketing, and operations
      personnel of the parties and their Affiliates, waives any further notice
      of such monitoring or recording, and agrees to notify such personnel of
      such monitoring or recording. Each party agrees to provide such recording
      to the other party upon reasonable request.

(s)   Waiver of Jury Trial. Each party waives any right it may have to a trial
      by jury in respect of any suit, action or proceeding relating to this
      Agreement or any Credit Support Document.

(t)   Form of ISDA Master Agreement. Party A and Party B hereby agree that the
      text of the body of the ISDA Master Agreement is intended to be the
      printed form of the ISDA Master Agreement (Multicurrency - Crossborder) as
      published and copyrighted in 1992 by the International Swaps and
      Derivatives Association, Inc.

(u)   Payment Instructions. Party A hereby agrees that, unless notified in
      writing by Party B of other payment instructions, any and all amounts
      payable by Party A to Party B under this Agreement shall be paid to the
      account specified in Item 4 of this Long-form Confirmation, below.

(v)   Additional representations.

      (i)   Representations of Party A. Party A represents to Party B on the
            date on which Party A enters into each Transaction that:--

            (1)   Party A's obligations under this Agreement rank pari passu
                  with all of Party A's other unsecured, unsubordinated
                  obligations except those obligations preferred by operation of
                  law.

      (ii)  Capacity. Party A represents to Party B on the date on which Party A
            enters into this Agreement that it is entering into the Agreement
            and the Transaction as principal and not as agent of any person. The
            Swap Trustee represents to Party A on the date on which the Swap
            Trustee executes this Agreement that it is executing the Agreement
            in its capacity as Swap Trustee.

(w)   Acknowledgements.

      (i)   Substantial financial transactions. Each party hereto is hereby
            advised and acknowledges as of the date hereof that the other party
            has engaged in (or refrained from engaging in) substantial financial
            transactions and has taken (or refrained from taking) other material
            actions in reliance upon the entry by the parties into the
            Transaction being entered into on the terms and conditions set forth
            herein and

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

            in the Pooling and Servicing Agreement relating to such Transaction,
            as applicable. This paragraph shall be deemed repeated on the trade
            date of each Transaction.

      (ii)  Bankruptcy Code. Subject to Part 5(m), without limiting the
            applicability if any, of any other provision of the U.S. Bankruptcy
            Code as amended (the "Bankruptcy Code") (including without
            limitation Sections 362, 546, 556, and 560 thereof and the
            applicable definitions in Section 101 thereof), the parties
            acknowledge and agree that all Transactions entered into hereunder
            will constitute "forward contracts" or "swap agreements" as defined
            in Section 101 of the Bankruptcy Code or "commodity contracts" as
            defined in Section 761 of the Bankruptcy Code, that the rights of
            the parties under Section 6 of this Agreement will constitute
            contractual rights to liquidate Transactions, that any margin or
            collateral provided under any margin, collateral, security, pledge,
            or similar agreement related hereto will constitute a "margin
            payment" as defined in Section 101 of the Bankruptcy Code, and that
            the parties are entities entitled to the rights under, and
            protections afforded by, Sections 362, 546, 556, and 560 of the
            Bankruptcy Code.

(x)   [Reserved.]

(y)   [Reserved.]

(z)   Additional Definitions.

      As used in this Agreement, the following terms shall have the meanings set
      forth below, unless the context clearly requires otherwise:

      "Approved Ratings Threshold" means each of the S&P Approved Ratings
      Threshold and the Moody's First Trigger Ratings Threshold

      "Approved Replacement" means, with respect to a Market Quotation, an
      entity making such Market Quotation, which entity would satisfy conditions
      (a), (b), (c) and (d) of the definition of Permitted Transfer (as
      determined by Party B in its sole discretion, acting in a commercially
      reasonable manner) if such entity were a Transferee, as defined in the
      definition of Permitted Transfer.

      "Derivative Provider Trigger Event" means (i) an Event of Default with
      respect to which Party A is a Defaulting Party, (ii) a Termination Event
      with respect to which Party A is the sole Affected Party or (iii) an
      Additional Termination Event with respect to which Party A is the sole
      Affected Party.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      "Eligible Guarantee" means an unconditional and irrevocable guarantee of
      all present and future obligations of Party A under this Agreement (or,
      solely for purposes of the definition of Eligible Replacement, all present
      and future obligations of such Eligible Replacement under this Agreement
      or its replacement, as applicable) which is provided by a guarantor as
      principal debtor rather than surety and which is directly enforceable by
      Party B, the form and substance of which guarantee are subject to the
      Rating Agency Condition with respect to S&P and either (A) a law firm has
      given a legal opinion confirming that none of the guarantor's payments to
      Party B under such guarantee will be subject to deduction or Tax collected
      by withholding and such opinion has been delivered to Moody's, or (B) such
      guarantee provides that, in the event that any of such guarantor's
      payments to Party B are subject to deduction or Tax collected by
      withholding, such guarantor is required to pay such additional amount as
      is necessary to ensure that the net amount actually received by Party B
      (free and clear of any Tax collected by withholding) will equal the full
      amount Party B would have received had no such deduction or withholding
      been required, or (C) in the event that any payment under such guarantee
      is made net of deduction or withholding for Tax, Party A is required,
      under Section 2(a)(i), to make such additional payment as is necessary to
      ensure that the net amount actually received by Party B from the guarantor
      will equal the full amount Party B would have received had no such
      deduction or withholding been required.

      "Eligible Replacement" means an entity (A) that lawfully could perform the
      obligations owing to Party B under this Agreement (or its replacement, as
      applicable), (B) (I) (x) which has credit ratings from S&P at least equal
      to the S&P Required Ratings Threshold or (y) all present and future
      obligations of which entity owing to Party B under this Agreement (or its
      replacement, as applicable) are guaranteed pursuant to an Eligible
      Guarantee provided by a guarantor with credit ratings from S&P at least
      equal to the S&P Required Ratings Threshold, in either case if S&P is a
      Rating Agency, and (II) (x) which has credit ratings from Moody's at least
      equal to the Moody's Second Trigger Ratings Threshold or (y) all present
      and future obligations of which entity owing to Party B under this
      Agreement (or its replacement, as applicable) are guaranteed pursuant to
      an Eligible Guarantee provided by a guarantor with credit ratings from
      Moody's at least equal to the Moody's Second Trigger Ratings Threshold, in
      either case if Moody's is a Rating Agency and (C) that has executed an
      Item 1115 Agreement with Depositor.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      "Estimated Swap Termination Payment" means, with respect to an Early
      Termination Date, an amount determined by Party A in good faith and in a
      commercially reasonable manner as the maximum payment that could be owed
      by Party B to Party A in respect of such Early Termination Date pursuant
      to Section 6(e) (as amended herein), taking into account then current
      market conditions.

      "Financial Institution" means a bank, broker/dealer, insurance company,
      structured investment company or derivative product company.

      "Firm Offer" means a quotation from an Eligible Replacement (i) in an
      amount equal to the actual amount payable by or to Party B in
      consideration of an agreement between Party B and such Eligible
      Replacement to replace Party A as the counterparty to this Agreement by
      way of novation or, if such novation is not possible, an agreement between
      Party B and such Eligible Replacement to enter into a Replacement
      Transaction (assuming that all Transactions hereunder become Terminated
      Transactions), and (ii) that constitutes an offer by such Eligible
      Replacement to replace Party A as the counterparty to this Agreement or
      enter a Replacement Transaction that will become legally binding upon such
      Eligible Replacement upon acceptance by Party B.

      "Moody's" means Moody's Investors Service, Inc., or any successor thereto.

      "Moody's First Trigger Ratings Threshold" means, with respect to Party A,
      the guarantor under an Eligible Guarantee, or an Eligible Replacement, (i)
      if such entity has a short-term unsecured and unsubordinated debt rating
      from Moody's, a long-term unsecured and unsubordinated debt rating or
      counterparty rating from Moody's of "A2" and a short-term unsecured and
      unsubordinated debt rating from Moody's of "Prime-1", or (ii) if such
      entity does not have a short-term unsecured and unsubordinated debt rating
      or counterparty rating

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      from Moody's, a long-term unsecured and unsubordinated debt rating or
      counterparty rating from Moody's of "A1".

      "Moody's Second Trigger Downgrade Event" means that no Relevant Entity has
      credit ratings from Moody's at least equal to the Moody's Second Trigger
      Ratings Threshold.

      "Moody's Second Trigger Ratings Threshold" means, with respect to Party A,
      the guarantor under an Eligible Guarantee, or an Eligible Replacement, (i)
      if such entity has a short-term unsecured and unsubordinated debt rating
      from Moody's, a long-term unsecured and unsubordinated debt rating or
      counterparty rating from Moody's of "A3" and a short-term unsecured and
      unsubordinated debt rating from Moody's of "Prime-2", or (ii) if such
      entity does not have a short-term unsecured and unsubordinated debt rating
      from Moody's, a long-term unsecured and unsubordinated debt rating or
      counterparty rating from Moody's of "A3".

      "Permitted Transfer" means a transfer by novation by Party A, pursuant to
      Section 6(b)(ii) or the Item 1115 Agreement which is incorporated by
      reference pursuant to Part 5(e), or which is described in Sections 7(a)(2)
      or (3) (as amended herein), to a transferee (the "Transferee") of Party
      A's rights, liabilities, duties and obligations under this Agreement, with
      respect to which transfer each of the following conditions is satisfied:
      (a) the Transferee is an Eligible Replacement; (b) Party A and the
      Transferee are both "dealers in notional principal contracts" within the
      meaning of Treasury regulations section 1.1001-4; (c) as of the date of
      such transfer the Transferee would not be required to withhold or deduct
      on account of Tax from any payments under this Agreement or would be
      required to gross up for such Tax under Section 2(d)(i)(4); (d) an Event
      of Default or Termination Event would not occur as a result of such
      transfer; (e) the Transferee contracts with Party B pursuant to a written
      instrument (the "Transfer Agreement") (A) (i) on terms which are effective
      to transfer to the Transferee all, but not less than all, of Party A's
      rights, liabilities, duties and obligations under the Agreement and all
      relevant Transactions, which terms are identical to the terms of this
      Agreement, other than party names, dates relevant to the effective date of
      such transfer, tax representations (provided that the

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      representations in Part 2(a)(i) are not modified) and any other
      representations regarding the status of the substitute counterparty of the
      type included in Part 5(b)(iv), Part 5(v)(i)(2) or Part 5(v)(ii), notice
      information and account details, and (ii) each Rating Agency has been
      given prior written notice of such transfer, or (B) (i) on terms that (x)
      have the effect of preserving for Party B the economic equivalent of all
      payment and delivery obligations (whether absolute or contingent and
      assuming the satisfaction of each applicable condition precedent) under
      this Agreement immediately before such transfer and (y) are, in all
      material respects, no less beneficial for Party B than the terms of this
      Agreement immediately before such transfer, as determined by Party B, and
      (ii) Moody's has been given prior written notice of such transfer and the
      Rating Agency Condition is satisfied with respect to S&P; (f) Party A will
      be responsible for any costs or expenses incurred in connection with such
      transfer (including any replacement cost of entering into a replacement
      transaction); and (g) such transfer otherwise complies with the terms of
      the Pooling and Servicing Agreement.

      "Rating Agency Condition" means, with respect to any particular proposed
      act or omission to act hereunder and each Rating Agency specified in
      connection with such proposed act or omission, that the party proposing
      such act or failure to act must consult with each of the specified Rating
      Agencies and receive from each such Rating Agency prior written
      confirmation that the proposed action or inaction would not cause a
      downgrade or withdrawal of the then-current rating of any Certificates or
      Notes.

      "Rating Agencies" mean, with respect to any date of determination, each of
      S&P,and Moody's to the extent that each such rating agency is then
      providing a rating for any of the Mortgage Pass-Through Certificates
      Series 2007-FLX6 (the "Certificates") or any notes backed by any of the
      Certificates (the "Notes").

      "Relevant Entities" mean Party A and, to the extent applicable, a
      guarantor under an Eligible Guarantee.

      "Replacement Transaction" means, with respect to any Terminated
      Transaction or group of Terminated Transactions, a transaction or group of
      transactions that (A) has terms which would be effective to transfer to a
      transferee all, but not less than all, of Party A's rights, liabilities,
      duties and obligations under this Agreement

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      and all relevant Transactions, which terms are identical to the terms of
      this Agreement, other than party names, dates relevant to the effective
      date of such transfer, tax representations (provided that the
      representations in Part 2(a)(i) are not modified) and any other
      representations regarding the status of the substitute counterparty of the
      type included in Part 5(b)(iv), Part 5(v)(i)(2) or Part 5(v)(ii), notice
      information and account details, save for the exclusion of provisions
      relating to Transactions that are not Terminated Transactions, or (B) (x)
      would have the effect of preserving for Party B the economic equivalent of
      any payment or delivery (whether the underlying obligation was absolute or
      contingent and assuming the satisfaction of each applicable condition
      precedent) under this Agreement in respect of such Terminated Transaction
      or group of Terminated Transactions that would, but for the occurrence of
      the relevant Early Termination Date, have been required after that date,
      and (y) has terms which are, in all material respects, no less beneficial
      for Party B than those of this Agreement (save for the exclusion of
      provisions relating to Transactions that are not Terminated Transactions),
      as determined by Party B.

      "Required Ratings Downgrade Event" means that no Relevant Entity has
      credit ratings at least equal to the Required Ratings Threshold.

      "Required Ratings Threshold" means each of the S&P Required Ratings
      Threshold and the Moody's Second Trigger Ratings Threshold

      "S&P" means Standard & Poor's Rating Services, a division of The
      McGraw-Hill Companies, Inc., or any successor thereto.

      "S&P Approved Ratings Threshold" means, with respect to Party A, the
      guarantor under an Eligible Guarantee, or an Eligible Replacement, a
      short-term unsecured and unsubordinated debt rating of "A-1" from S&P, or,
      if such entity does not have a short-term unsecured and unsubordinated
      debt rating from S&P, a long-term unsecured and unsubordinated debt rating
      or counterparty rating of "A+" from S&P.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

      "S&P Required Ratings Downgrade Event" means that no Relevant Entity has
      credit ratings from S&P at least equal to the S&P Required Ratings
      Threshold.

      "S&P Required Ratings Threshold" means, with respect to Party A, the
      guarantor under an Eligible Guarantee, or an Eligible Replacement, (I) if
      such entity is a Financial Institution, a short-term unsecured and
      unsubordinated debt rating of "A-2" from S&P, or, if such entity does not
      have a short-term unsecured and unsubordinated debt rating from S&P, a
      long-term unsecured and unsubordinated debt rating or counterparty rating
      of "BBB+" from S&P, or (II) if such entity is not a Financial Institution,
      a short-term unsecured and unsubordinated debt rating of "A-1" from S&P,
      or, if such entity does not have a short-term unsecured and unsubordinated
      debt rating from S&P, a long-term unsecured and unsubordinated debt rating
      or counterparty rating of "A+" from S&P.

               [Remainder of this page intentionally left blank.]

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

Item 4. Account Details and Settlement Information:

Party A:     Deutsche Bank Trust Company Americas, New York, NY: 021001033'

             FAO:  Merrill Lynch Capital Services, Inc., New York, NY

             Acct:  00-811-874

Party B:     Deutsche Bank Trust Co - Americas

             New York, NY  10006

             ABA 021-001-033

             Account 01419663

             Name:  NYLTD Funds Control-Stars West

             Re:  IndyMac INDX Mortgage Loan Trust

             2007-FLX6 Swap Account

This Agreement may be executed in several counterparts, each of which shall be
deemed an original but all of which together shall constitute one and the same
instrument.

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

We are very pleased to have executed this Transaction with you and we look
forward to completing other transactions with you in the near future.

Very truly yours,

MERRILL LYNCH CAPITAL SERVICES, INC. ("Party A")

By:      _______________________________
         Name:
         Title:

Party B, acting through its duly authorized signatory, hereby agrees to, accepts
and confirms the terms of the foregoing as of the date hereof.

DEUTSCHE BANK NATIONAL TRUST COMPANY, not in its individual capacity but solely
as Swap Trustee on behalf of the SwapTrust with respect to INDYMAC INDX MORTGAGE
LOAN TRUST 2007-FLX6, Mortgage Pass-Through Certificates, Series 2007-FLX6

By:      _______________________________
         Name:
         Title:

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                                   SCHEDULE A

-------- --------------------------------- -------------------------
                Calculation Period
-------- --------------------------------- -------------------------
            From and          To but                 USD
           Including *      Excluding *        Notional Amount
-------- ---------------- ---------------- -------------------------
   1        25-Jul-08        25-Aug-08           1,370,829.14
-------- ---------------- ---------------- -------------------------
   2        25-Aug-08        25-Sep-08           1,339,452.32
-------- ---------------- ---------------- -------------------------
   3        25-Sep-08        25-Oct-08           1,306,989.54
-------- ---------------- ---------------- -------------------------
   4        25-Oct-08        25-Nov-08           1,274,451.95
-------- ---------------- ---------------- -------------------------
   5        25-Nov-08        25-Dec-08           1,243,422.32
-------- ---------------- ---------------- -------------------------
   6        25-Dec-08        25-Jan-09           1,221,144.03
-------- ---------------- ---------------- -------------------------
   7        25-Jan-09        25-Feb-09           1,202,325.71
-------- ---------------- ---------------- -------------------------
   8        25-Feb-09        25-Mar-09           1,183,849.22
-------- ---------------- ---------------- -------------------------
   9        25-Mar-09        25-Apr-09           1,167,012.87
-------- ---------------- ---------------- -------------------------
  10        25-Apr-09        25-May-09           1,150,896.69
-------- ---------------- ---------------- -------------------------
  11        25-May-09        25-Jun-09           1,137,493.70
-------- ---------------- ---------------- -------------------------
  12        25-Jun-09        25-Jul-09           1,123,000.73
-------- ---------------- ---------------- -------------------------
  13        25-Jul-09        25-Aug-09           1,106,964.11
-------- ---------------- ---------------- -------------------------
  14        25-Aug-09        25-Sep-09           1,090,771.95
-------- ---------------- ---------------- -------------------------
  15        25-Sep-09        25-Oct-09           1,073,585.72
-------- ---------------- ---------------- -------------------------
  16        25-Oct-09        25-Nov-09           1,055,117.94
-------- ---------------- ---------------- -------------------------
  17        25-Nov-09        25-Dec-09           1,037,357.62
-------- ---------------- ---------------- -------------------------
  18        25-Dec-09        25-Jan-10           1,019,947.94
-------- ---------------- ---------------- -------------------------
  19        25-Jan-10        25-Feb-10           1,005,122.90
-------- ---------------- ---------------- -------------------------
  20        25-Feb-10        25-Mar-10             989,767.90
-------- ---------------- ---------------- -------------------------
  21        25-Mar-10        25-Apr-10             975,754.27
-------- ---------------- ---------------- -------------------------
  22        25-Apr-10        25-May-10             961,997.23
-------- ---------------- ---------------- -------------------------
  23        25-May-10        25-Jun-10             950,814.32
-------- ---------------- ---------------- -------------------------
  24        25-Jun-10        25-Jul-10             934,941.59
-------- ---------------- ---------------- -------------------------
  25        25-Jul-10        25-Aug-10             912,808.96
-------- ---------------- ---------------- -------------------------
  26        25-Aug-10        25-Sep-10             880,165.70
-------- ---------------- ---------------- -------------------------
  27        25-Sep-10        25-Oct-10             847,206.18
-------- ---------------- ---------------- -------------------------
  28        25-Oct-10        25-Nov-10             816,167.71
-------- ---------------- ---------------- -------------------------
  29        25-Nov-10        25-Dec-10             790,462.33
-------- ---------------- ---------------- -------------------------
  30        25-Dec-10        25-Jan-11             767,860.95
-------- ---------------- ---------------- -------------------------
  31        25-Jan-11        25-Feb-11             747,873.97
-------- ---------------- ---------------- -------------------------
  32        25-Feb-11        25-Mar-11             728,427.13
-------- ---------------- ---------------- -------------------------
  33        25-Mar-11        25-Apr-11             710,403.24
-------- ---------------- ---------------- -------------------------
  34        25-Apr-11        25-May-11             692,857.33
-------- ---------------- ---------------- -------------------------
  35        25-May-11        25-Jun-11             677,443.81
-------- ---------------- ---------------- -------------------------
  36        25-Jun-11        25-Jul-11             664,281.15
-------- ---------------- ---------------- -------------------------
  37        25-Jul-11        25-Aug-11             648,160.86
-------- ---------------- ---------------- -------------------------
  38        25-Aug-11        25-Sep-11             631,525.41
-------- ---------------- ---------------- -------------------------
  39        25-Sep-11        25-Oct-11             613,661.74
-------- ---------------- ---------------- -------------------------
  40        25-Oct-11        25-Nov-11             594,688.86
-------- ---------------- ---------------- -------------------------
  41        25-Nov-11        25-Dec-11             576,434.86
-------- ---------------- ---------------- -------------------------
  42        25-Dec-11        25-Jan-12             557,695.28
-------- ---------------- ---------------- -------------------------

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

-------- ---------------- ---------------- -------------------------
  43        25-Jan-12        25-Feb-12             540,259.70
-------- ---------------- ---------------- -------------------------
  44        25-Feb-12        25-Mar-12             522,517.26
-------- ---------------- ---------------- -------------------------
  45        25-Mar-12        25-Apr-12             505,290.84
-------- ---------------- ---------------- -------------------------
  46        25-Apr-12        25-May-12             485,145.67
-------- ---------------- ---------------- -------------------------
  47        25-May-12        25-Jun-12             466,157.29
-------- ---------------- ---------------- -------------------------
  48        25-Jun-12        25-Jul-12             446,479.77
-------- ---------------- ---------------- -------------------------
  49        25-Jul-12        25-Aug-12             424,040.29
-------- ---------------- ---------------- -------------------------
  50        25-Aug-12        25-Sep-12             400,221.93
-------- ---------------- ---------------- -------------------------
  51        25-Sep-12        25-Oct-12             374,788.40
-------- ---------------- ---------------- -------------------------
  52        25-Oct-12        25-Nov-12             350,239.33
-------- ---------------- ---------------- -------------------------
  53        25-Nov-12        25-Dec-12             327,895.90
-------- ---------------- ---------------- -------------------------
  54        25-Dec-12        25-Jan-13             307,592.32
-------- ---------------- ---------------- -------------------------
  55        25-Jan-13        25-Feb-13             290,699.40
-------- ---------------- ---------------- -------------------------
  56        25-Feb-13        25-Mar-13             275,208.54
-------- ---------------- ---------------- -------------------------
  57        25-Mar-13        25-Apr-13             260,983.31
-------- ---------------- ---------------- -------------------------
  58        25-Apr-13        25-May-13             247,909.84
-------- ---------------- ---------------- -------------------------
  59        25-May-13        25-Jun-13             236,263.63
-------- ---------------- ---------------- -------------------------
  60        25-Jun-13        25-Jul-13             225,495.89
-------- ---------------- ---------------- -------------------------
  61        25-Jul-13        25-Aug-13             214,139.47
-------- ---------------- ---------------- -------------------------
  62        25-Aug-13        25-Sep-13             203,336.57
-------- ---------------- ---------------- -------------------------
  63        25-Sep-13        25-Oct-13             192,964.05
-------- ---------------- ---------------- -------------------------
  64        25-Oct-13        25-Nov-13             177,168.08
-------- ---------------- ---------------- -------------------------
  65        25-Nov-13        25-Dec-13             163,815.74
-------- ---------------- ---------------- -------------------------
  66        25-Dec-13        25-Jan-14             152,138.25
-------- ---------------- ---------------- -------------------------
  67        25-Jan-14        25-Feb-14             142,460.86
-------- ---------------- ---------------- -------------------------
  68        25-Feb-14        25-Mar-14             133,648.45
-------- ---------------- ---------------- -------------------------
  69        25-Mar-14        25-Apr-14             126,083.57
-------- ---------------- ---------------- -------------------------
  70        25-Apr-14        25-May-14             119,367.64
-------- ---------------- ---------------- -------------------------
  71        25-May-14        25-Jun-14             113,579.48
-------- ---------------- ---------------- -------------------------
  72        25-Jun-14        25-Jul-14             108,043.71
-------- ---------------- ---------------- -------------------------
  73        25-Jul-14        25-Aug-14             102,037.76
-------- ---------------- ---------------- -------------------------
  74        25-Aug-14        25-Sep-14              96,341.25
-------- ---------------- ---------------- -------------------------
  * Such dates being subject to adjustment in accordance with the
       Modified Following Business Day Convention with respect
                      to the Floating Rate Payer
--------------------------------------------------------------------

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                                     Annex A

                    Paragraph 13 of the Credit Support Annex

<PAGE>
[LOGO OMITTED] [MERRILL LYNCH]

                                     Annex B

                               Item 1115 Agreement

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