Document:

<PAGE>
                                                                    EXHIBIT 4.15

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
ANY STATE SECURITIES LAWS OR THE SECURITIES LAWS OF ANY OTHER JURISDICTION. THIS
NOTE MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, OR HYPOTHECATED BY THE HOLDER
IN THE UNITED STATES OR TO U.S. PERSONS IN THE ABSENCE OF A REGISTRATION
STATEMENT IN EFFECT WITH RESPECT TO THE NOTE UNDER SUCH ACT AND SUCH APPLICABLE
STATE LAWS OR AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF SUCH ACT AND
SUCH LAWS OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED.

                             INTERCHANGE CORPORATION

No. _________                                                    $______________

Date:________, 2003

                     8% CONVERTIBLE SECURED PROMISSORY NOTE

INTERCHANGE CORPORATION, a Delaware corporation (the "Company" or "Maker"), the
principal office of which is located at , for value received, hereby promises to
pay to the order of _______________________________, or his or her registered
assigns (the "Holder"), at ______________________________________, the sum of
_________________________ Dollars ($________) (the "Principal Amount"), together
with interest on the unpaid principal balance of this Note from time to time
outstanding until such principal amount is paid in full, such interest to be due
and payable as set forth herein. The principal amount, and any unpaid accrued
interest hereon, shall be due and payable on the earlier of (i) _________, 2004
(the first anniversary of the date set forth above) or (ii) fifteen (15) days
after the date of consummation by the Company of any financing (whether equity
or debt or a combination thereof) with aggregate gross proceeds equal to or in
excess of $10,000,000 (the "Maturity Date"), or such earlier date of prepayment,
as provided herein. Payment for all amounts due under this Note shall be made by
mail to the registered address of the Holder. Each payment by the Company
pursuant to this Note shall be made without set-off or counterclaim and shall be
made in lawful currency of the United States of America and in immediately
available funds.

1.    This Note is one of an issue of the Company's 8% Convertible Secured
Promissory Notes in the aggregate principal amount of up to $3,000,000 (the
"Notes") issued in a private placement (the "Placement") pursuant to the
Company's Unit Purchase Agreement dated as of June , 2003 a copy of which
agreement is available for inspection at the Company's principal office.
Notwithstanding any provision to the contrary contained herein, this Note is
subject and entitled to those terms, conditions, covenants and agreements
contained in the Purchase Agreement that are expressly applicable to the Notes.
Any transferee of this Note, by its acceptance hereof, assumes the obligations
of the Holder in the Purchase Agreement with respect to the conditions and
procedures for transfer of this Note.

2.    The following is a statement of the rights of the Holder of this Note and
the conditions to which this Note is subject, and to which the Holder hereof, by
the acceptance of this Note,

                                      C-1
<PAGE>

agrees:

A.    Interest. The Company shall pay simple interest at the rate of eight
percent (8%) per annum on the Principal Amount outstanding from time to time.
Interest shall be payable on the maturity date or earlier upon conversion or
prepayment.

B.    Prepayment. The Principal Amount may be prepaid in whole or in part at any
time upon fifteen (15) days' prior written notice to the Holder (a "Prepayment
Notice").

C.    Conversion of Note.

      (i)   Optional Conversion. The Holder shall have the right, at its option,
at any time prior to the Maturity Date, to convert all or any portion of the
outstanding Principal Amount into shares of the Company's common stock at a
conversion price equal to the lesser of (i) $ per share or (ii) if the Company
consummates an initial public offering prior to the first anniversary of the
issuance of this Note, the price of an initial public offering price of shares
of Common Stock of the Company (or if such offering consists of convertible or
derivative securities convertible into Common Stock, the conversion or exercise
price of the primary security contained therein) less 30% (the "Optional
Conversion Price"). The Holder may exercise its right of conversion hereunder
after receipt of a Prepayment Notice and prior to the date set for prepayment.

The shares of Common Stock to be issued upon such conversion in accordance with
Section 2C hereof are herein referred to as the "Conversion Shares."

      (ii)  Adjustment of Conversion Price. (A) In case the Company shall
hereafter (a) declare a dividend or make a distribution on its outstanding
shares of Common Stock in shares of Common Stock, (b) subdivide or reclassify
its outstanding shares of Common Stock into a greater number of shares, or (c)
combine or reclassify its outstanding shares of Common Stock into a smaller
number of shares, the Optional Conversion Price in effect at the time of such
dividend or distribution or of the effective date of such subdivision,
combination or reclassification shall be adjusted so that it shall equal the
price determined by multiplying the Optional Conversion Price by a fraction, the
denominator of which shall be the number of shares of Common Stock outstanding
after giving effect to such action, and the numerator of which shall be the
number of shares of Common Stock outstanding immediately prior to such action.
Such adjustment shall be made successively whenever any event listed above shall
occur.

      (B)   In addition to the foregoing adjustments under Section (A) above,
the Optional Conversion Price shall be subject to adjustment, on a weighted
average basis, in the event that the Company issues any shares of its Common
Stock or any security convertible into shares of Common Stock, at a price less
than the then current Optional Conversion Price (other than grants to employees
under stock option plans approved by the Board).

      (iii) In connection with an initial public offering , at the request of
the underwriter, each Holder will be required not to sell or otherwise dispose
of any of our securities for a period of 180 days following the effective date
of the registration statement for such offering.

                                      C-2
<PAGE>

D.    Mechanics of Conversion.

Before the Holder shall be entitled to convert this Note into Conversion Shares
in accordance with Section 3A, the Holder shall surrender this Note at the
office of the Company, and shall give written notice to the Company at its
principal corporate office in the form attached hereto as Exhibit A together
with a schedule in the form of Schedule 1 attached hereto, of the election to
convert the same and shall state therein the name or names in which the
certificate or certificates for the Conversion Shares are to be issued. The
Company shall, as soon as practicable thereafter, issue and deliver to the
Holder a certificate or certificates for the number of Conversion Shares to
which the Holder shall be entitled as aforesaid. Such conversion shall be deemed
to have been made immediately prior to the close of business on the date of such
surrender of the Note to be converted, and the Holder shall be treated for all
purposes as the record holder of such shares of Common Stock as of such date.

E.    Registration Rights.

The Holder shall be entitled to the registration rights included in the
Subscription Agreement between the Company and the original Holder of this Note.

      3.    Grant of Security Interest. The Company's obligations under the
Notes are secured by a junior lien in all of the Company's assets pursuant to a
security agreement (the "Security Agreement") of even date herewith between the
Company and GunnAllen Financial Inc, as agent for the holders of the Notes.

      4.    Covenants of the Company. Maker covenants and agrees that, so long
as this Note remains outstanding and unpaid, in whole or in part:

      (A)   Maker will not, and will not permit any of its Subsidiaries to,
sell, transfer or in any other manner alienate or dispose of all or
substantially all of its assets; provided, however, that Maker or any of its
Subsidiaries may effect such a transaction if the payment of this Note is duly
provided for from such sale proceeds;

      (B)   Maker will, and will cause each of its Subsidiaries to, promptly pay
and discharge all lawful taxes, assessments and governmental charges or levies
imposed upon it, its income and profits, or any of its property, before the same
shall become in default, as well as all lawful claims for labor, materials and
supplies which, if unpaid, might become a lien or charge upon such properties or
any part thereof; provided, however, Maker shall not be deemed to have violated
this covenant or to be in default hereunder as a result of the liens for taxes
payable as of the date hereof to (i) the State of California for payroll and
related taxes in the amount of approximately $108,000 or (ii) taxes payable to
the Internal Revenue Service in the amount of approximately $1,960,000 . In
addition, Maker or such Subsidiary shall not be required to pay and discharge
any such tax, assessment, charge, levy or claim so long as the validity thereof
shall be contested in good faith by appropriate proceedings and Maker or such
Subsidiary, as the case may be, shall set aside on its books adequate reserves
with respect to any such tax, assessment, charge, levy or claim so contested;

                                      C-3
<PAGE>

      (C)   Maker will, and will cause each of its Subsidiaries to, do or cause
to be done all things necessary to preserve and keep in full force and effect
its corporate existence, rights and franchises and comply with all laws
applicable to Maker as its counsel may advise;

      (D)   Maker will, promptly following the occurrence of an Event of Default
or of any condition or event which, with the giving of notice or the lapse of
time or both, would constitute an Event of Default, furnish a statement of
Maker's Chief Executive Officer or Chief Financial Officer to Holder setting
forth the details of such Event of Default or condition or event and the action
which Maker intends to take with respect thereto;

      (E)   Maker will, and will cause each of its Subsidiaries to, at all times
maintain books of account in which all of its financial transactions are duly
recorded in conformance with generally accepted accounting principles;

      (F)   Maker, until payment in full of all Principal and Interest due on
the Notes, will not pay or declare any cash or in kind dividends or other
distributions with respect to its capital stock;

      (G)   Maker covenants and agrees that it will at all times reserve and
keep available out of its authorized capital stock such number of shares of
Common Stock of Maker as may be required for issuance upon conversion of the
Notes;

      (H)   Maker will not, and will not permit any of its Subsidiaries to, make
any loan to any executive officer or any person who is or becomes a holder of 5%
of the capital stock of Maker, other than for reasonable advances for expenses
in the ordinary course of business;

      (I)   Maker will not, and will not permit any of its Subsidiaries to,
purchase or otherwise redeem any Common Stock, except in connection with the
termination of services of an employee-shareholder or the settlement of any
dispute with a shareholder; provided, however, that in the event shares of a
shareholder owning 5% or more of the Company's capital stock, are repurchased in
connection with such shareholder's disassociation from the Company, such
repurchase price shall not exceed $500,000;

      (J)   Except with the prior written consent of the Majority Holders, Maker
will not, and will not permit any of its Subsidiaries to, create, incur, assume,
permit, guarantee or suffer to exist any indebtedness or any other obligations
for money borrowed except for (i) indebtedness existing on the date hereof; (ii)
indebtedness under the Notes; (iii) trade payables incurred in the normal course
of business; and (iv) indebtedness or other obligations for money borrowed which
are subordinated in all respects, including, but not limited to, priority upon
liquidation, to the Notes.

      (K)   Except with the prior written consent of the Majority Holders, after
an Event of Default, Maker will not, and will not permit any of its Subsidiaries
to, pay or prepay any amounts under any outstanding indebtedness or other
obligations for money borrowed or any indebtedness or other obligation for money
borrowed incurred subsequent to the date hereof, whether or not such
indebtedness becomes due, past due or accelerated, except for (i) all of the
Notes on a pro rata basis; and (ii) Excluded Indebtedness.

                                      C-4
<PAGE>

      (L)   The Company shall cause any Subsidiary existing as of the date
hereof or organized after the date of this Note to be bound by the terms hereof
to the same extent as the Company.

            "Subsidiary" or "Subsidiaries" shall mean any corporation or other
organization, whether incorporated or unincorporated, in which the Company owns,
directly or indirectly, any equity or other ownership interest and in which such
ownership interest entitles the Company to elect a majority of the Board of
Directors or similar governing body or otherwise controls the management of such
entity.

            (M)   The proceeds received by the Company from the sale of the
Notes shall be used by the Company only for working capital purposes, payments
to distribution partners and repayment of bridge loans.

            (N)   Maker will forward to the Holder, within 90 days after the end
of each fiscal year, an audited balance sheet of the Company as at the end of
such year, together with an audited income statement and other related audited
statements of operations and cash flows of the Company for such year, examined
and reported upon by an accounting firm reasonably acceptable to the Purchasers,
prepared in accordance with GAAP consistently applied;

      (O)   Maker will forward to the Holder, within 45 days after the end of
each fiscal quarter, unaudited balance sheets and statements of operations and
cash flows of the Company, such balance sheets to be as of the end of such
quarter and such statements of operations and cash flows to be both for the
year-to-date period as of the end of such quarter and for the quarter prepared
in accordance with GAAP consistently applied, together with a brief written
discussion and analysis by management of such financial statements

      (P)   To forward to the Holder promptly, from time to time, such other
information regarding the business, prospects, financial condition, operations,
property or affairs of the Company as the Majority Holders reasonably may
request in writing.

      5.    Events of Default. If any of the events specified in this Section 4
shall occur (herein individually referred to as an "Event of Default"), the
Holder of the Note may, so long as such condition exists, declare the entire
principal and unpaid accrued interest thereon immediately due and payable, by
notice in writing to the Company:

      (i)   Default in the payment of the Principal Amount or accrued interest
            on this Note when due and payable if such default is not cured by
            the Company within ten (10) days after the due date of such payment;
            or

      (ii)  The institution by the Company of proceedings to be adjudicated as
            bankrupt or insolvent, or the consent by it to institution of
            bankruptcy or insolvency proceedings against it, or the filing by it
            of a petition or answer or consent seeking reorganization or release
            under the United States Bankruptcy Code, or any other applicable
            federal or state law, or the consent by it to the filing of any such
            petition or the appointment of a receiver, liquidator, assignee,
            trustee, or other similar official of the Company, or of any
            substantial part of its property, or the

                                      C-5
<PAGE>

            making by it of an assignment for the benefit of creditors, or the
            taking of corporate action by the Company in furtherance of any such
            action; or

      (iii) If, within sixty (60) days after the commencement of an action
            against the Company (and service of process in connection therewith
            on the Company) seeking any bankruptcy, insolvency, reorganization,
            liquidation, dissolution, or similar relief under any present or
            future statute, law, or regulation, such action shall not have been
            resolved in favor of the Company or all orders or proceedings
            thereunder affecting the operations or the business of the Company
            stayed, or if the stay of any such order or proceeding shall
            thereafter be set aside, or if, within sixty (60) days after the
            appointment without the consent or acquiescence of the Company of
            any trustee, receiver, or liquidator of the Company or of all or any
            substantial part of the properties of the Company, such appointment
            shall not have been vacated; or

      (iv)  The holder of any lien and security interest senior to the lien
            granted to the holder of this Note declares an event of default
            under its security agreement or other evidence of indebtedness; or.

      (v)   The Company receives written notice of a default in the payment of a
            debt or obligation (other than trade payables in the ordinary course
            of business and taxes discussed in item 4.B) in the amount of
            $50,000 singly or $500,000 in the aggregate; or

      (vi)  There occurs a "change of control" in the Company, defined to mean
            either (A) the individuals who constitute a majority of the Board of
            Directors of the Company as of the date of issue of this Note cease,
            for any reason, to constitute a majority of the Board of Directors
            of the Company at anytime prior to the Maturity Date, except for
            resignations; or (B) there occurs an acquisition (other than
            directly from the Company) of any voting securities of the Company
            (the "Voting Securities") by any "Person" (as the term person is
            used for purposes of Section 13(d) or 14(d) of the Securities
            Exchange Act of 1934, as amended (the "1934 Act")) immediately after
            which such Person has "Beneficial Ownership" (within the meaning of
            Rule 13d-3 promulgated under the 1934 Act) of fifty percent (50%) or
            more of the combined voting power of the Company's then outstanding
            Voting Securities; or

      (vii) There occurs a "Corporate Control Transaction" which shall be
            defined to mean (A) a sale of all or substantially all of the
            Company's assets or (B) a transaction (or series of transactions,
            including a merger, consolidation or other reorganization of the
            Company, or issuance of additional shares of capital stock of the
            Company other than in connection with capital raising transactions)
            which results in the holders of the Company's capital stock prior to
            the transaction owning less than 50% of the voting power, on a
            combined, fully diluted, as-converted basis for all outstanding
            classes thereof, of the Company's capital stock after the
            transaction; or

      (viii) A Default is declared or occurs under the Security Agreement; or

                                      C-6
<PAGE>

      (ix)  There occurs a breach by the Company of any covenant contained in
            this Note or any other Note and/or any provision of the Subscription
            Agreement executed in connection with the sale and purchase of the
            Notes.

In any such event, the Holder, upon written notice to the Company, may
accelerate the payment of principal and interest due under the Note and may
exercise any and all remedies available thereto at law or equity.
Notwithstanding the foregoing, the Majority Holders then outstanding at the time
of any of the foregoing Event of Default shall have the right to waive any such
Event of Default, except that no such waiver shall be deemed a waiver of an
Event of Default with respect to the non-payment of principal or interest
hereunder with respect to a non-waiving Holder.

5.    Assignment. Subject to the restrictions on transfer described in Section 6
below, the rights and obligations of the Company and the Holder of this Note
shall be binding upon and benefit the successors, assigns, heirs, personal and
legal representatives, and transferees of the parties. Furthermore, the Holder
may only assign this Note to a person or entity that is (i) an accredited
investor under applicable securities laws and (ii) either another holder of a
substantially similar promissory note by the Company or a person or entity
reasonably acceptable to the Company.

6.    Transfer of this Note. With respect to any offer, sale or other
disposition of this Note, the Holder will give written notice to the Company
prior thereto, describing briefly the proposed manner thereof, together with a
written opinion of such Holder's counsel in form and substance satisfactory to
the Company, to the effect that such offer, sale, or other disposition may be
effected without registration or qualification (under any U.S. federal or
applicable state securities law then in effect) and that the requirements of
Section of this Note have been met. Upon receiving such written notice and
opinion, the Company, as promptly as practicable, shall notify such Holder that
such Holder may sell or otherwise dispose of this Note, all in accordance with
the terms of the notice delivered to the Company. If a determination has been
made pursuant to this Section 6 that the opinion of counsel for the Holder is
not reasonably satisfactory to the Company, the Company shall so notify the
Holder promptly after such determination has been made. Each Note transferred as
permitted hereby shall bear a legend as to the applicable restrictions on
transferability in order to ensure compliance with the Securities Act of 1933,
as amended (the "Act"), unless in the opinion of counsel for the Company such
legend is not required in order to ensure compliance with the Act. The Company
may issue stop transfer instructions to its transfer agent in connection with
such restrictions.

7.    Registered Holder. The Company may consider and treat the person in whose
name this Note shall be registered as the absolute owner thereof for all
purposes whatsoever (whether or not this Note shall be overdue) and the Company
shall not be affected by any notice to the contrary. In case of transfer of this
Note by operation of law, the transferee agrees to notify the Company of such
transfer and of its address, and to submit appropriate evidence regarding such
transfer so that this Note may be registered in the name of the transferee. This
Note is transferable only on the books of the Company by the Holder hereof, in
person or by attorney, on the surrender hereof, duly endorsed. Communications
sent to any registered owner shall be effective as against all Holders or
transferees of the Note not registered at the time of sending the communication.

                                      C-7
<PAGE>

8.    Amendments and Waivers. The provisions of this Note, including, but not
limited to, any change to the conversion price, may from time to time be
amended, modified or waived, if such amendment, modification or waiver is in
writing and consented to by the Company and the Holders of not less than 50% in
principal amount of the Notes then outstanding; provided, however, that no such
amendment, modification or waiver which would (i) modify this Section 8, (ii)
extend the Maturity Date for more than 90 days, or (iii) reduce the Principal
Amount payable hereunder shall be made without the consent of the Holder of each
Note so affected. After any waiver or amendment becomes effective, the Company
shall mail to the Holder a copy thereof.

9.    Accounting Treatment of Note. As envisioned by generally accepted
accounting principles, the Company will treat, account, and report the Note as
debt and not equity for accounting purposes and with respect to any returns
filed with federal, state, or local tax authorities.

10.   Notices. Any notice, request, or other communication required or permitted
hereunder shall be in writing and shall be deemed to have been duly given if
personally delivered, or if mailed by registered or certified mail, postage
prepaid, or if delivered by nationally recognized overnight delivery service at
the respective addresses of the parties as set forth herein. Any party hereto
may by notice so given change its address for future notice hereunder.

11.   No Stockholder Rights. Nothing contained in this Note shall be construed
as conferring upon the Holder or any other person the right to vote or to
consent or to receive notice as a stockholder in respect of meetings of
stockholders for the election of directors of the Company or any other matters
or any rights whatsoever as a stockholder of the Company; and no dividends shall
be payable or accrued in respect of this Note.

12.   Additional Definitions. For purposes of this Note, the following terms
shall have the definitions set forth below.

      A.    "Excluded Indebtedness" shall mean (a) up to $500,000 of accounts
receivable financing, and any deferrals, renewals or extensions of any such
indebtedness and notes or other instruments or evidences of indebtedness issued
in respect of or in exchange for any such indebtedness or any funding to pay or
replace any such indebtedness or credit unless in the instrument creating or
evidencing the same, or pursuant to which it is outstanding, it is provided that
such indebtedness or such deferral, renewal or extension thereof is not senior
in right of payment to this Note (b) Promissory Notes in favor of Frastacky
Associates Inc., in the amount of $1,300,000 plus accrued interest.

      B.    "Majority Holders" shall mean the holders of 50.1% or more of the
principal amount of the Notes outstanding as of the date of any such event.

13.   Denominations. At the request of the Holder, upon surrender of this Note,
the Maker shall promptly issue new Notes in the aggregate outstanding Principal
amount hereof, in the form hereof, in such denominations of at least $10,000 as
the Holder shall request.

14.   Replacement of Note. Upon receipt of evidence reasonably satisfactory to
the Maker of the loss, theft, destruction or mutilation of this Note and, in the
case of any such loss, theft or destruction, upon delivery of an indemnity
agreement reasonably satisfactory in form and

                                      C-8
<PAGE>

amount to the Maker, or, in the case of any such mutilation, upon surrender and
cancellation of this Note, the Maker, at its expense, will execute and deliver,
in lieu thereof, a new Note of like tenor.

15.   Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, excluding that body of law
relating to conflict of laws.

16.   Submission to Jurisdiction. Maker and Holder (i) agree that any legal
suit, action or proceeding arising out of or relating to this Note shall be
instituted exclusively in the New York State Supreme Court, County of New York
or in the United States District Court for the Southern District of New York,
(ii) waive any objection which Maker and Holder may have now or hereafter based
upon forum non conveniens or to the venue of any such suit, action or
proceeding, and (iii) irrevocably consent to the jurisdiction of the New York
State Supreme Court, County of New York and the United States District Court for
the Southern District of New York in any such suit, action or proceeding. Maker
and Holder further agree to accept and acknowledge service of any and all
process which may be served in any such suit, action or proceeding in the New
York State Supreme Court County of New York or in the United States District
Court for the Southern District of New York and agrees that service of process
upon the Maker or Holder, as the case may be, mailed by certified mail to the
Maker's or Holder's address, will be deemed in every respect effective service
of process upon Maker and/or Holder, in any suit, action or proceeding. FURTHER,
BOTH MAKER AND HOLDER HEREBY WAIVE TRIAL BY JURY IN ANY ACTION TO ENFORCE THIS
NOTE AND IN CONNECTION WITH ANY DEFENSE, COUNTERCLAIM OR CROSS CLAIM ASSERTED IN
ANY SUCH ACTION .

17.   Interest Rate. If any interest rate specified herein is held to be
impermissible, then the rate charged on the indebtedness represented hereby
shall be reduced to the highest rate then permitted by law.

IN WITNESS WHEREOF, the Company has caused this Note to be signed in its name by
a duly authorized officer.

                                     INTERCHANGE CORPORATION

                                     By:____________________
                                           Name:
                                           Title:

                                      C-9
<PAGE>

                                    EXHIBIT A

                                CONVERSION NOTICE

(To be Executed by the Registered Holder
in order to convert Debentures)

      The undersigned hereby elects to convert the principal amount of the Note
indicated below, into shares of Common Stock of Interchange Corporation as of
the date written below. If shares are to be issued in the name of a Person other
than undersigned, the undersigned will pay all transfer taxes payable with
respect thereto and is delivering herewith such certificates and opinions as
reasonably requested by the Company in accordance therewith. No fee will be
charged to the Holder for any conversion, except for such transfer taxes, if
any. All terms used in this notice shall have the meanings set forth in the
Note.

Conversion calculations:     ___________________________________________________
                             Date to Effect Conversion

                             ___________________________________________________
                             Principal amount of Note owned prior to conversion

                             ___________________________________________________
                             Principal amount of Note to be Converted

                             ___________________________________________________
                             Principal amount of Note remaining after Conversion

                             ___________________________________________________
                             Number of shares of Common Stock to be Issued

                             Conversion Price___________________________________

                             Signature__________________________________________

                             Name_______________________________________________

                             Address____________________________________________

      By the delivery of this Conversion Notice, the Holder represents and
warrants to the Company that its ownership of the shares of Common Stock does
not exceed the restrictions set forth in Sections 5(b) of the Debenture.

                                      C-10
<PAGE>

                                   SCHEDULE 1

                               CONVERSION SCHEDULE

8% Convertible Debentures, due [ ], 2004, in the aggregate principal amount of
$_______ issued by Interchange Corporation. This Conversion Schedule reflects
conversions made under the above referenced Promissory Note.

Dated:

<TABLE>
<CAPTION>
                                            Aggregate
                                            Principal
                                             Amount
                                            Remaining                       Mandatory
                                          Subsequent to     Applicable     Prepayment
Date of Conversion  Amount of Conversion   Conversion    Conversion Price    Amount
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<S>                 <C>                   <C>            <C>               <C>

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</TABLE>

                                      C-1<PAGE>
                                                                    EXHIBIT 4.16

NEITHER THESE SECURITIES NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR
THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED FOR SALE, SOLD OR OTHERWISE DISPOSED
OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT FILED UNDER THE
SECURITIES ACT OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND
IN COMPLIANCE WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS.

IW No.____

                             INTERCHANGE CORPORATION
                              COMMON STOCK WARRANT

      This certifies that ______________ ("Holder") is entitled to purchase,
subject to the terms and conditions of this Warrant, from Interchange
Corporation, a Delaware corporation (the "Company"), ________ (___) fully paid
and nonassessable shares of the Company's Common Stock, par value $.00001 per
Share ("Common Stock"), in accordance with Section 2 during the period
commencing on ______, 2003 and ending at 5:00 p.m. California time, ____, 2008
(the "Expiration Date"), at which time this Warrant will expire and become void
unless earlier terminated as provided herein. The shares of Common Stock of the
Company for which this Warrant is exercisable, as adjusted from time to time
pursuant to the terms hereof, are hereinafter referred to as the "Shares."

1.    Exercise Price. The initial purchase price for the Shares shall be $____
per share. Such price shall be subject to adjustment pursuant to the terms
hereof (such price, as adjusted from time to time, is hereinafter referred to as
the "Exercise Price").

      (i)   Exercise and Payment. Commencing on the date hereof, this Warrant
may be exercised, in whole or in part, from time to time by the Holder, during
the term hereof, by surrender of this Warrant and the Exercise Agreement annexed
hereto duly completed and executed by the Holder to the Company at the principal
executive offices of the Company, together with payment in the amount obtained
by multiplying the Exercise Price then in effect by the number of Shares thereby
purchased, as designated in the Exercise Agreement. Payment may be in cash, by
wire transfer of immediately available funds to an account specified by the
Company or by cashier's check payable to the order of the Company.

2.    Reservation of Shares. The Company hereby agrees that at all times there
shall be reserved for issuance and delivery upon exercise of this Warrant such
number of shares of Common Stock or other shares of capital stock of the Company
as are from time to time issuable upon exercise of this Warrant. All such shares
shall be duly authorized, and when issued upon such exercise, shall be validly
issued, fully paid and non-assessable, free and clear of all liens, security
interests, charges and other encumbrances or restrictions on sale and free and
clear of all preemptive rights.

3.    Delivery of Stock Certificates. Within a reasonable time after exercise,
and in no event more than 7 business days thereafter, in whole or in part, of
this Warrant, the Company shall issue in the name of and deliver to the Holder a
certificate or certificates for the number of fully paid and nonassessable
shares of Common Stock which the Holder shall have requested in the Exercise

                                      D-1
<PAGE>

Agreement. If this Warrant is exercised in part, the Company shall deliver to
the Holder a new Warrant for the unexercised portion of this Warrant at the time
of delivery of such stock certificate or certificates.

4.    No Fractional Shares. No fractional shares or scrip representing
fractional shares will be issued upon exercise of this Warrant. If upon any
exercise of this Warrant a fraction of a share results, the Company will pay the
Holder the difference between the fair market value of the fractional share and
the portion of the Exercise Price allocable to the fractional share.

5.    Charges, Taxes and Expenses. The Company shall pay all transfer taxes or
other incidental charges, if any, in connection with the transfer of the Shares
purchased pursuant to the exercise hereof from the Company to the Holder.

6.    Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt by the
Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to the Company,
and upon reimbursement to the Company of all reasonable expenses incidental
thereto, and upon surrender and cancellation of this Warrant, if mutilated, the
Company will make and deliver a new Warrant of like tenor and dated as of such
cancellation, in lieu of this Warrant.

7. Saturdays, Sundays, Holidays, Etc. If the last or appointed day for the
taking of any action or the expiration of any right required or granted herein
shall be a Saturday or a Sunday or shall be a legal holiday, then such action
may be taken or such right may be exercised on the next succeeding weekday which
is not a legal holiday.

8.    Adjustment of Exercise Price and Number of Shares. The Exercise Price and
the number of and kind of securities purchasable upon exercise of this Warrant
shall be subject to adjustment from time to time as follows:

      (a)   Subdivisions, Combinations and Other Issuances. If the Company shall
at any time after the date hereof but prior to the expiration of this Warrant
subdivide its outstanding securities as to which purchase rights under this
Warrant exist, by stock split or otherwise, or combine its outstanding
securities as to which purchase rights under this Warrant exist, the number of
Shares as to which this Warrant is exercisable as of the date of such
subdivision, stock split or combination shall forthwith be proportionately
increased in the case of a subdivision, or proportionately decreased in the case
of a combination. Appropriate adjustments shall also be made to the Exercise
Price, but the aggregate purchase price payable for the total number of Shares
purchasable under this Warrant as of such date.

      (b)   Merger. If at any time after the date hereof there shall be a merger
or consolidation of the Company with or into another corporation when the
Company is not the surviving corporation, then lawful provision shall be made so
that the Holder shall thereafter be entitled to receive upon exercise of this
Warrant, during the period specified herein and upon payment of the aggregate
Exercise Price then in effect, the number of shares or other securities or
property of the successor corporation resulting from such merger or
consolidation, which would have been received by Holder for the shares of stock
subject to this Warrant had this Warrant been exercised prior to such merger or
consolidation.

      (c)   Reclassification, Etc. If at any time after the date hereof there
shall be a change or reclassification of the securities as to which purchase
rights under this Warrant exist into the same or

                                      D-2
<PAGE>

a different number of securities of any other class or classes, then the Holder
shall thereafter be entitled to receive upon exercise of this Warrant, during
the period specified herein and upon payment of the Exercise Price then in
effect, the number of shares or other securities or property resulting from such
change or reclassification, which would have been received by Holder for the
shares of stock subject to this Warrant had this Warrant at such time been
exercised.

9.    Notice of Adjustments; Notices. Whenever the Exercise Price or number of
Shares purchasable hereunder shall be adjusted pursuant to Section 10 hereof,
the Company shall execute and deliver to the Holder a certificate setting forth,
in reasonable detail, the event requiring the adjustment, the amount of the
adjustment, the method by which such adjustment was calculated and the Exercise
Price and number of and kind of securities purchasable hereunder after giving
effect to such adjustment, and shall cause a copy of such certificate to be
mailed (by first class mail, postage prepaid) to the Holder.

10.   Rights As Stockholder; Notice to Holders. Nothing contained in this
Warrant shall be construed as conferring upon the Holder or his or its
transferees the right to vote or to receive dividends or to consent or to
receive notice as a shareholder in respect of any meeting of shareholders for
the election of directors of the Company or of any other matter, or any rights
whatsoever as shareholders of the Company. The Company shall give notice to the
Warrantholder by registered mail if at any time prior to the expiration or
exercise in full of the Warrants, any of the following events shall occur:

            (a)   a dissolution, liquidation or winding up of the Company shall
be proposed;

            (b)   a capital reorganization or reclassification of the Common
Stock (other than a subdivision or combination of the outstanding Common Stock
and other than a change in the par value of the Common Stock) or any
consolidation or merger of the Company with or into another corporation (other
than a consolidation or merger in which the Company is the continuing
corporation and that does not result in any reclassification or change of Common
Stock outstanding) or in the case of any sale or conveyance to another
corporation of the property of the Company as an entirety or substantially as an
entirety; or

            (c)   a taking by the Company of a record of the holders of any
class of securities for the purpose of determining the holders thereof who are
entitled to receive any dividend (other than a cash dividend) or other
distribution, any right to subscribe for, purchase or otherwise acquire any
shares of stock of any class or any other securities or property, or to receive
any other rights.

Such giving of notice shall be simultaneous with the giving of notice to holders
of Common Stock. Such notice shall specify the record date or the date of
closing the stock transfer books, as the case may be. Failure to provide such
notice shall not affect the validity of any action taken in connection with such
dividend, distribution or subscription rights, or proposed merger,
consolidation, sale, conveyance, dissolution, liquidation or winding up.

11.   Restricted Securities; Registration Rights. The Holder understands that
this Warrant and the Shares purchasable hereunder constitute "restricted
securities" under the federal securities laws inasmuch as they are, or will be,
acquired from the Company in transactions not involving a public offering and
accordingly may not, under such laws and applicable regulations, be resold or
transferred without registration under the Securities Act of 1933, as amended
(the "Securities Act") or an applicable exemption from such registration. Unless
the Shares are registered in accordance with the requirements of the Securities
Act, the Holder further acknowledges that a securities legend

                                      D-3
<PAGE>

substantially in the form appearing on the first page of this Warrant shall be
placed on any Shares issued to the Holder upon exercise of this Warrant.

      The Holder of this Warrant shall be entitled to the registration rights
with respect to the Shares as set forth in the Subscription Agreement entered
into by the Company in connection with the purchase of this warrant by the
original Holder.

12.   Certification of Investment Purpose. Unless a current registration
statement under the Securities Act shall be in effect with respect to the
securities to be issued upon exercise of this Warrant, the Holder covenants and
agrees that, at the time of exercise hereof, it will deliver to the Company a
written certification executed by the Holder that the securities acquired by him
upon exercise hereof are for the account of such Holder and acquired for
investment purposes only and that such securities are not acquired with a view
to, or for sale in connection with, any distribution thereof. This Warrant is
acquired by the Holder for investment purposes, and not with a view to, or for
sale in connection with, any distribution thereof. The Holder is experienced in
business and financial matters and has the capacity to protect the Holder's
interests. The Holder is an "accredited investor" as defined in Rule 501(a)
promulgated under the Securities Act.

13.   Market-Standoff Period; Agreement. In connection with the initial public
offering of the Company's securities and upon request of the Company or the
underwriters managing such offering of the Company's securities, each Holder
hereby agrees not to sell, make any short sale of, loan, grant any option for
the purchase of, or otherwise dispose of any securities of the Company (other
than any disposed of in the registration and those acquired by the Holder in the
registration or thereafter in open market transactions) without the prior
written consent of the Company or such underwriters, as the case may be, for
such period of time (not to exceed 180 days) from the effective date of such
registration as may be requested by the Company or such managing underwriters
and to execute an agreement reflecting the foregoing as may be requested by the
underwriters at the time of the Company's initial public offering.

14.   Miscellaneous.

      (a)   Construction. Unless the context indicates otherwise, the term
"Holder" shall include any transferee or transferees of this Warrant pursuant to
Section 15(b), and the term "Warrant" shall include any and all warrants
outstanding pursuant to this Agreement, including those evidenced by a
certificate or certificates issued upon division, exchange or substitution.

      (b)   Notices. Unless otherwise provided, any notice required or permitted
under this Warrant shall be given in writing and shall be deemed effectively
given upon personal delivery to the party to be notified or three (3) days
following deposit with the United States Post Office, by registered or certified
mail, postage prepaid and addressed to the party to be notified (or one (1) day
following timely deposit with a reputable overnight courier with next day
delivery instructions), or upon confirmation of receipt by the sender of any
notice by facsimile transmission, at the address indicated below or at such
other address as such party may designate by ten (10) days' advance written
notice to the other parties.

      To Holder:        ________
                        ________
                        ________

                                      D-4
<PAGE>

      To the Company:            Interchange Corporation
                                 24422 Avenida de la Carlota, Suite 120.
                                 Laguna Hills, CA  92653
                                 Attention: Heath B. Clarke, Chairman

      With a copy to:            Falk, Shaff & Ziebell, LLP
                                 18881 Von Karman, Suite 1400
                                 Irvine, CA 92612
                                 Attention:  Mark Ziebell, Esq.

      (c)   Governing Law. This Warrant shall be governed by and construed under
the laws of the State of Delaware.

      (d)   Entire Agreement. This Warrant, the exhibits and schedules hereto,
and the documents referred to herein, constitute the entire agreement and
understanding of the parties hereto with respect to the subject matter hereof,
and supersede all prior and contemporaneous agreements and understandings,
whether oral or written, between the parties hereto with respect to the subject
matter hereof.

      (e)   Binding Effect. This Warrant and the various rights and obligations
arising hereunder shall inure to the benefit of and be binding upon the Company
and its successors and assigns, and Holder and its successors and assigns.

      (f)   Waiver; Consent. This Warrant may not be changed, amended,
terminated, augmented, rescinded or discharged (other than by performance), in
whole or in part, except by a writing executed by the parties hereto, and no
waiver of any of the provisions or conditions of this Warrant or any of the
rights of a party hereto shall be effective or binding unless such waiver shall
be in writing and signed by the party claimed to have given or consented
thereto.

      (g)   Severability. If one or more provisions of this Warrant are held to
be unenforceable under applicable law, such provision shall be excluded from
this Warrant and the balance of the Warrant shall be interpreted as if such
provision were so excluded and the balance shall be enforceable in accordance
with its terms.

      (h)   Counterparts. This Warrant may be signed in several counterparts,
each of which shall constitute an original.

                                      D-5
<PAGE>

      IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
exercised effective as of _______, 2003.

                                THE COMPANY:

                                Interchange Corporation

                                ___________________________________
                                By:      Heath B. Clarke
                                Title:   Chairman

                                      D-6

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