Document:

<PAGE>

                                                                    Exhibit 10.5

                                SUPPLY AGREEMENT

      THIS SUPPLY AGREEMENT (the "Agreement") made and entered into as of
February 29, 2000, by and between Asia Pulp & Paper Company Ltd., a Singapore
corporation ("APP"), and PaperExchange.com, Inc., a Delaware corporation
("PaperExchange").

      WHEREAS, APP manufactures and markets certain paper products (the "APP
Products") world-wide and purchases paper pulp in the manufacture of the APP
Products;

      WHEREAS, PaperExchange provides a real-time on-line trading exchange (the
"Exchange") for paper and other products to registered users of PaperExchange
services (the "Members");

      WHEREAS, APP is a Member of PaperExchange pursuant to the terms of the
Membership Agreement dated as of __________ (the "Membership Agreement"); and

      WHEREAS, Paper Exchange and APP desire that, among other things, APP
commit to list on the Exchange certain quantities of APP Products for sale in
Credit-Approved Transactions, as such term is defined in the Membership
Agreement, and to list a portion of its pulp paper requirements on the Exchange;

      NOW THEREFORE, the parties, in consideration of the undertakings and
commitments set forth herein, agree as follows:

      1. Defined Terms. All capitalized terms not otherwise defined herein shall
have the meaning set forth in the Membership Agreement.

      2. Listings. (a) APP agrees to use reasonable commercial efforts to list
on the Exchange for sale pursuant to Credit--Approved Transactions a minimum of
***** metric tons of APP Products per month, subject to availability of the APP
Products. PaperExchange agrees to accept the foregoing listings. (b) APP agrees
to list a portion of its pulp purchase requirements on the Exchange

      3. Further Use of the Exchange. APP agrees to make a good faith evaluation
of the expansion of its use of the Exchange for additional sales of APP
Products, including without limitation, transitioning some portion of APP's
existing customers to the site and using the site to facilitate future sales of
APP Products to APP's existing customer base.

      4. Terms of Sale. The terms of sale for the APP Products listed on the
Exchange shall be governed by the Credit-Approved Transactions Agreement and the
Credit-Approved Purchase Terms for Credit-Approved Transactions in effect as of
the sale. APP understands that in the case of all Credit-Approved Transactions,
all sales shall be to PaperExchange and that PaperExchange shall resell the APP
Products to Buyers in accordance with the Credit-Approved Buyer Terms for
Credit-Approved Transactions in effect as of the sale date.

* Confidential Treatment Requested: material has been omitted and filed
  separately with the Commission.

<PAGE>

      5. Term and Termination. Unless earlier terminated as hereinafter
provided, the term of this Agreement shall be for period of one (1) year from
the date hereof. APP and PaperExchange acknowledge that either party may
terminate this Agreement at any time without cause, upon no less than thirty
(30) days' prior written notice to the other party. If PaperExchange (a) without
APP's consent makes material modifications to the Membership Agreement or the
Credit-Approved Transaction Agreement or any other of the Credit Approved
Transaction documents which, in APP's reasonable discretion, have a potential
adverse economic impact on APP, or (b) materially breaches any of the economic
terms of an Credit Approved Transaction Agreement or any other of the Credit
Approved Transaction documents, then APP may, in its sole discretion,
immediately terminate this Agreement and/or its Membership in the Exchange.

      6. Goals. Notwithstanding any other provision of this Agreement, the
parties acknowledge that Paragraph 2 is intended to establish a minimum listing
goal for APP. APP and PaperExchange shall work together to cause APP to reach
the goal, however APP shall not be responsible to PaperExchange if it is unable,
for any reason, to meet the listing goal.

      7. General Provisions.

            7.1 APP and PaperExchange are independent contractors. Nothing in
this Agreement is intended to or will constitute either party as an agent, legal
representative, joint venturer or partner of the other for any purpose.

            7.2 A waiver of a breach of any term of this Agreement will not be
construed as a waiver of any succeeding breach of that term or as a waiver of
the term itself. A party's performance after the other's breach will not be
construed as a waiver of that breach.

            7.3 All notices required or permitted under this Agreement and all
requests for approvals, consents, and waivers must be in writing and must be
delivered to the parties at their respective addresses by a method providing for
proof of delivery. Any notice or request will be deemed to have been given on
the date of receipt.

      If to PaperExchange:                    If to APP:

      PaperExchange.com, Inc.                 Asia Pulp & Paper Company Ltd.
      545 Boylston Street, 8th Floor          118 Pioneer Road
      Boston, MA 02116                        Singapore 639498
      Attention: President and CEO            Attention: A. Nilo
      Telecopier No.: (617) 536-1573          Telecopier No.: (65) 477-6116
<PAGE>

      with copies to:                         with copies to:

      Bingham Dana LLP                        Pillsbury Madison & Sutro LLP
      150 Federal Street                      725 S. Figueroa Street, Suite 1200
      Boston, MA 02110                        Los Angeles, CA 90017
      Attention: Jonathan K. Bernstein, Esq.  Attention: Dana P. Newman, Esq.
      Telecopier No.: (617) 951-8736          Telecopier No.: (213) 629-1033

            7.4 Neither party may assign its rights or obligations under this
Agreement without the prior written consent of the other, except that APP may
assign this Agreement to its parent company, to any of the companies owned or
controlled by its parent, or to any of its subsidiaries. The Agreement shall be
binding upon and inure to the benefit of the parties and their successors and
permitted assigns.

            7.5 Except as this Agreement or the Membership Agreement otherwise
provides, no amendment to this Agreement or the Membership Agreement will be
binding unless agreed to in writing and executed by the parties, and no
approval, consent, or waiver will be enforceable unless the granting party signs
it.

            7.6 Each term of this Agreement is severable. If a court, agency, or
arbitrator having jurisdiction determines that any term is invalid or
unenforceable under applicable law, that determination will not affect the other
terms of this Agreement, as the case may be, which other terms will continue to
be enforced as if the invalid or unenforceable terms were omitted.

            7.7 Any advertising, publicity, release, or other disclosure of
information concerning this Agreement must be approved in writing by both
parties, which approval shall not be unreasonably withheld or delayed, except to
the extent disclosure is legally required.

            7.8 This Agreement, in conjunction with the Membership Agreement,
and the Credit-Approved Transaction Agreement, states the complete agreement
between the parties concerning the subject matter hereof, and supersedes earlier
oral and written communications between the parties concerning the subject
matter hereof.

            7.9 The validity and construction of this Agreement shall be
governed by and construed in accordance with the internal laws (and not the
choice-of-law rules) of the State of New York.

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

            7.11 The parties agree that any dispute relating to this Agreement
shall be subject to arbitration under the commercial rules of the American
Arbitration Association.

                           [signature page to follow]
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Agreement as of the day and year first above written.

                              PaperExchange.com, Inc.,
                              a Delaware corporation

                              By: /s/ Kent A. Dolby
                                  ---------------------------
                              Name:  PRESIDENT & CEO
                              Title: KENT A. DOLBY

                              ASIA PULP & PAPER COMPANY LTD.,
                              a Singapore corporation

                              By:
                                  ---------------------------
                              Name:
                              Title:
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Agreement as of the day and year first above written.

                              PaperExchange.com, Inc.,
                              a Delaware corporation

                              By:
                                  ---------------------------
                              Name:
                              Title:

                              ASIA PULP & PAPER COMPANY LTD.,
                              a Singapore corporation

                              By: /s/ Ted C. Lin
                                  ---------------------------
                              Name:  Ted C. Lin
                              Title: Attorney in Fact<PAGE>

                                                                    Exhibit 10.6

NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF
THIS WARRANT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "1933 ACT"), AND NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK
ISSUABLE UPON EXERCISE OF THIS WARRANT CAN BE SOLD NOR SUCH SHARES OF COMMON
STOCK TRANSFERRED UNLESS THE REGISTRATION PROVISIONS OF THE SAID ACT HAVE BEEN
COMPLIED WITH OR UNLESS, IN THE OPINION OF COUNSEL SATISFACTORY TO THE COMPANY,
BOTH AS TO THE IDENTITY OF THE COUNSEL AND AS TO THE FORM AND SUBSTANCE OF THE
OPINION, COMPLIANCE WITH SUCH PROVISIONS IS NOT REQUIRED.

Date: March 7, 2000                                       Warrant to Purchase
                                                          Shares of Common Stock

                             PAPEREXCHANGE.COM, INC.

                              PARTICIPATION WARRANT

No. 1

      THIS CERTIFIES that Staples, Inc., a Delaware corporation (the "Holder"),
is entitled, at any time during the Warrant Exercise Period (as hereinafter
defined), to subscribe for and purchase from PAPEREXCHANGE.COM, INC., a Delaware
corporation (including any entity which shall succeed to or assume the
obligations of PaperExchange.com, Inc. hereunder, the "Company"), with a
principal office at 545 Boylston Street, 8th Floor, Boston, Massachusetts 02116,
up to the Applicable Number, as adjusted from time to time, of the Shares (as
defined in Section 1 hereof) at an initial purchase price per Share of
$11.557373 (such price per Share as adjusted from time to time as provided
herein is referred to herein as the "Exercise Price"). The number of such Shares
and the Exercise Price are subject to adjustment as provided herein. This
Warrant is fully vested on the Issue Date.

      This Warrant is subject to the following terms and conditions:

      Section 1. Definitions. As used herein the following terms, unless the
context otherwise requires, have the following respective meanings:

      Applicable Number shall mean Five Hundred Nineteen Thousand One Hundred
Forty-nine (519,149) Shares (as adjusted pursuant to the terms hereof).

      Company shall have the meaning set forth in the first paragraph of this
Warrant.

      Common Stock shall mean (i) the Company's Common Stock, $0.001 par value
per share, (ii) any other capital stock of any class or classes (however
designated) of the Company, the holders of which shall have the right, without
limitation as to amount, either to all or to a share of the balance of current
dividends and liquidating dividends after the payment of dividends and
distributions on any shares entitled to preference, and (iii) any other
securities into which or for which any of the securities described in clauses
(i) or (ii) above have been

* Confidential Treatment Requested: material has been omitted and filed
  separately with the Commission.

<PAGE>
                                      -2-

converted or exchanged pursuant to a plan of recapitalization, reorganization,
merger, sale of assets or otherwise.

      Cut Sheet Paper shall have the meaning set forth in Section 2.2 hereof.

      Early Expiration Date shall have the meaning set forth in Section 2.2
hereof.

      Exercise Price shall have the meaning set forth in the first paragraph of
this Warrant.

      Fair Market Value shall mean (i) prior to a Qualified Public Offering, the
Non-Public Company Fair Market Value, and (ii) after a Qualified Public
Offering, the average, for the period of ten (10) Business Days prior to the
date of exercise, of the closing prices (if listed on a stock exchange or quoted
on the NASDAQ National Market System or any successor thereto), or the average
of the closing bid and asked prices (if quoted on NASDAQ or otherwise publicly
traded) of the Shares.

      Holder shall have the meaning set forth in the first paragraph of this
Warrant.

      Issue Date shall mean March 7, 2000.

      Measuring Period shall have the meaning set forth in Section 2.2.

      Non-Public Company Fair Market Value shall mean, with respect to Shares or
Other Securities, the fair market value of such Shares or Other Securities as
determined in good faith by the Company's Board of Directors. The Non-Public
Company Fair Market Value shall in all cases be calculated by determining the
Non-Public Company Fair Market Value of the entire stock and other securities of
the Company or of the issuer of any Other Securities taken as a whole, without
premium for control or discounts for minority interests or restrictions on
transfer and taking into consideration any plans or proposals for any mergers,
sales of assets, acquisitions or substantial sales of stock or other securities
of the Company by the Company or its stockholders relating to the Company or by
any such other issuer.

      Other Securities refers to any stock (other than Common Stock) and other
securities of the Company or any other entity (corporate or otherwise) (i) which
the holder of this Warrant at any time shall be entitled to receive, or shall
have received, on the exercise of this Warrant, in lieu of or in addition to
Common Stock, or (ii) which at any time shall be issuable or shall have been
issued in exchange for or in replacement of Common Stock or Other Securities, in
each case pursuant to Section 6 or 7 hereof.

      Person shall mean an individual, partnership, corporation, limited
liability company, business trust, joint stock company, trust, unincorporated
association, joint venture, governmental authority or other entity of whatever
nature.

      Purchases shall mean when the Holder takes title to Cut Sheet Paper from
the Company (in its capacity as principal and not as agent for seller) by means
of a transaction on the Company's Internet web site.

      Qualified Public Offering shall mean an offering to the public of
securities of the Company in a firm commitment underwriting providing for gross
proceeds to the Company of at least $100,000,000.00.

<PAGE>
                                      -3-

      Shares shall mean shares of Common Stock.

      Stockholders' Agreement shall mean the Company's Stockholders' Agreement,
dated as of February 28, 2000, as in effect on the date hereof and thereafter as
amended or restated in compliance with its terms.

      Total Exercise Price shall mean the price obtained by multiplying (a)
$11.557373 and (b) the total number of Shares issuable, as of the Issue Date,
upon exercise of this Warrant.

      Warrant Exercise Period shall mean the period beginning on March 7, 2015
and ending on the Warrant Expiration Date; provided that if the Holder earns the
right to exercise all or a portion of this Warrant early pursuant to Section
2.2, with respect to that portion of the Warrant subject to such early exercise
right, the "Warrant Exercise Period" shall mean the period beginning on the
first day after the end of the Measuring Period for which such right was earned
and shall end on the Early Expiration Date.

      Warrant Expiration Date shall have the meaning set forth in Section 2.3
hereof.

      Warrant Shares shall mean: (i) the Shares as they are provided for as at
the date of this Warrant and issuable upon the exercise or conversion of this
Warrant or any warrants delivered in substitution or exchange therefor; and (ii)
shall include any Other Securities which may become and be issuable upon such
exercise or conversion.

      Section 2. Exercise of Warrant.

      2.1. Exercise.

      (a) This Warrant may be exercised by the Holder during the Warrant
Exercise Period at any time or from time to time, in whole or in part, by
surrender of this Warrant, with the form of subscription attached as Exhibit A
hereto duly executed by the Holder, to the Company at its principal office,
accompanied by payment in cash by certified or official bank check payable to
the order of the Company or by wire transfer to its account, in the amount
obtained by multiplying the number of Shares for which this Warrant is then
being exercised by the Exercise Price then in effect.

      (b) In the event the Warrant is not exercised in full, the Company, at its
expense, will forthwith issue and deliver to or upon the order of the Holder a
new Warrant or Warrants of like tenor, in the name of the Holder or as the
Holder (upon payment by the Holder of any applicable transfer taxes) may
request, calling in the aggregate on the face or faces thereof for the number of
Shares equal (without giving effect to any adjustment therein) to the number of
such Shares called for on the face of this Warrant minus the number of such
Shares (without giving effect to any adjustment therein) for which this Warrant
shall have been exercised.

      2.2. Early Exercise Rights. For each measuring period set forth on
Schedule 1 attached hereto (each a "Measuring Period"), the Holder will earn the
right to exercise this Warrant for a number of Shares equal to the product of
(i) 3.95 multiplied by (ii) the number of whole tons of cut sheet paper and
paper stock for the Holder's advertising and catalogues ("Cut Sheet Paper") that
the Holder Purchases through the Company's web site exchange during such

<PAGE>
                                      -4-

Measuring Period up to the maximum number of whole tons of Cut Sheet Paper set
forth on Schedule 1 for such Measuring Period, subject to adjustment as provided
in Sections 6 and 7. The rights earned in this Section 2.2 may be exercised
during the Warrant Exercise Period for such rights; provided that any right to
exercise this Warrant earned pursuant to this Section 2.2 shall terminate on the
fifth anniversary of the last day of the Measuring Period for which such right
was earned (the "Early Expiration Date") unless exercised in full prior thereto.

      2.3. Expiration. This Warrant shall terminate upon the earlier to occur of
(i) exercise in full, (ii) the Early Expiration Date with respect to, but only
with respect to, any Shares for which the right to early exercise was earned
pursuant to Section 2.2 and (iii) April 7, 2015 (the "Warrant Expiration Date").

      Section 3. Registration Rights. The Holder understands that (i) this
Warrant and the Shares issuable upon exercise of this Warrant have not been
registered under the 1933 Act by reason of their issuance in a transaction
exempt from the registration requirements of the 1933 Act, (ii) this Warrant and
the Shares issuable upon exercise of this Warrant must be held indefinitely
unless a subsequent disposition thereof is registered under the 1933 Act and
applicable state securities laws or is exempt from such registration (and, upon
request, evidence satisfactory to the Company is provided by the Holder of the
availability of such exemptions, including, upon request, the delivery to the
Company of opinions of counsel to the Holder, which opinions of counsel are
satisfactory to the Company), and (iii) this Warrant and the Shares issuable
upon exercise of this Warrant may bear a legend to such effect.

      Section 4. No Fractional Shares or Scrip. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise or conversion
of this Warrant or any portion thereof. With respect to any fraction of a share
called for upon the exercise or conversion of this Warrant or any portion
thereof, an amount equal to such fraction multiplied by the then current Fair
Market Value of a Warrant Share shall be paid to the Holder in cash by the
Company.

      Section 5. Charges, Taxes and Expenses. Issuance of Warrant Shares upon
the exercise or conversion of this Warrant or any portion thereof shall be made
without charge to the Holder for any issue or transfer taxes or any other
incidental expenses in respect of the issuance of such Warrant Shares, all of
which taxes and expenses shall be paid by the Company, and such Warrant Shares
shall be issued in the name of the Holder; provided, however, that any income
taxes or capital gains taxes or similar taxes shall be payable by the Holder.

      Section 6. Adjustment for Reorganization, Consolidation, Merger, Etc.

            6.1. Certain Adjustments. With respect to, but only with respect to,
      any Shares for which the right to early exercise was earned pursuant to
      Section 2.2, in case at any time or from time to time during the period
      commencing on the Issue Date and ending on the Early Expiration Date for
      such Shares (the "Adjustment Period"), the Company shall (a) effect a
      capital reorganization, reclassification or recapitalization, (b)
      consolidate with or merge into any other entity, or (c) transfer all or
      substantially all of its properties or assets to any other entity under
      any plan or arrangement contemplating the dissolution of the Company, then
      in each such case, the Holder, on the exercise hereof as provided in
      Section 2 hereof at any time after the consummation of such
      reorganization, reclassification, recapitalization, consolidation or
      merger or the effective date of such dissolution, as the case may be,
      shall receive, in lieu of the Shares (or Other Securities) issuable on
      such exercise prior to such consummation or effective date, the

<PAGE>
                                      -5-

      Shares and Other Securities and property (including cash) to which the
      Holder would have been entitled upon such consummation or in connection
      with such dissolution, as the case may be, if the Holder had so exercised
      this Warrant immediately prior thereto, all subject to further adjustment
      thereafter as provided in Section 7 hereof.

            6.2. Continuation of Terms. Upon any reorganization, consolidation,
      merger or transfer (and any dissolution following any transfer) during the
      Adjustment Period and referred to in this Section 6, this Warrant shall
      continue in full force and effect and the terms hereof shall be applicable
      to the Shares and Other Securities and property receivable on the exercise
      of this Warrant after the consummation of such reorganization,
      reclassification, recapitalization, consolidation or merger or the
      effective date of dissolution following any such transfer, as the case may
      be, and shall be binding upon the issuer of any such Shares or Other
      Securities, including, in the case of any such transfer, the Person
      acquiring all or substantially all of the properties or assets of the
      Company, whether or not such Person shall have expressly assumed the terms
      of this Warrant as provided in Section 8 hereof.

      Section 7. Adjustment of Exercise Price and Number of Shares. The Exercise
Price and number of Shares issuable upon exercise or conversion hereof shall be
subject to adjustment from time to time at any time after the Issue Date as
follows:

            7.1. Adjustments for Distributions of Shares or Other Securities,
      Splits and Combinations. With respect to, but only with respect to, any
      Shares for which the right to early exercise was earned pursuant to
      Section 2.2, in case at any time or from time to time during the
      Adjustment Period, the Company shall (a) issue any Shares or Other
      Securities as a dividend or distribution, or (b) issue any Shares or Other
      Securities in subdivision of outstanding Shares or Other Securities by
      reclassification or otherwise, then the then current number and type of
      Warrant Shares issuable upon exercise or conversion hereof shall be
      adjusted to a number and type equal to the number and type of Warrant
      Shares issuable upon exercise immediately prior to such event plus the
      number and type of Warrant Shares the Holder would have received had the
      Holder exercised this Warrant immediately prior to such event and received
      the number and type of Shares issued in connection with such event and the
      Exercise Price shall be adjusted to an amount equal to the Total Exercise
      Price (or, if this Warrant has previously been exercised in part, the
      remaining unpaid portion of the Total Exercise Price) divided by the total
      number of Warrant Shares issuable upon exercise of this Warrant after
      giving effect to this adjustment. In case at any time or from time to time
      the Company shall combine outstanding Shares or Other Securities by
      reclassification or otherwise, then the then current number and type of
      Warrant Shares issuable upon exercise or conversion hereof shall be
      adjusted to a number and type equal to the number and type of Warrant
      Shares the Holder would have received had the Holder exercised this
      Warrant immediately prior to such event and received the number and type
      of Shares issued in connection with such event and the Exercise Price
      shall be adjusted to an amount equal to the Total Exercise Price (or, if
      this Warrant has previously been exercised in part, the remaining unpaid
      portion of the Total Exercise Price) divided by the total number of
      Warrant Shares issuable upon exercise of this Warrant after giving effect
      to this adjustment.

            7.2. Record of Holders. In case the Company shall take a record of
      the holders of its Shares for the purpose of entitling them (a) to receive
      a dividend or other distribution payable in Shares or Other Securities, or
      (b) to subscribe for or purchase Shares or Other Securities, then such
      record date shall be deemed to be the date of the issue or sale of the
      Shares or Other Securities deemed to have been issued or sold upon the
      declaration of such

<PAGE>
                                      -6-

      dividend or the making of such other distribution or the date of the issue
      of such right of subscription or purchase, as the case may be.

      Section 8. No Dilution. The Company will not, by amendment of its
Certificate of Incorporation, or through any reorganization, transfer of assets,
consolidation, merger or dissolution, avoid or seek to avoid the observance or
performance of any of the terms of this Warrant. Without limiting the generality
of the foregoing, the Company (a) will take all such action as may be necessary
or appropriate in order that the Company may validly and legally issue fully
paid and non-assessable Shares on the exercise of the Warrant from time to time,
and (b) will not transfer all or substantially all of its properties and assets
to any other entity, or consolidate with or merge into any other entity or
permit any such entity to consolidate with or merge into the Company, unless
such other entity shall expressly assume in writing and will be bound by all the
terms of this Warrant.

      Section 9. Accountants' Certificate as to Adjustments. In the case of each
event that may require any adjustment or readjustment in the Warrant Shares
issuable on the exercise of this Warrant, the Company at its expense will
promptly prepare a certificate setting forth such adjustment or readjustment, or
stating the reasons why no adjustment or readjustment is being made, and
showing, in detail, the facts upon which any such adjustment or readjustment is
based, including a statement of (a) the number of shares of each class of the
Company's Common Stock then outstanding on a fully diluted basis, and (b) the
number of shares of each class of Warrant Shares to be received upon exercise of
this Warrant, in effect immediately prior to such adjustment or readjustment and
as adjusted and readjusted (if required by Section 6 or Section 7) on account
thereof. The Company will forthwith mail a copy of each such certificate to each
holder of a Warrant, and will, on the written request at any time of any holder
of a Warrant, furnish to such holder a like certificate setting forth the
calculations used to determine such adjustment or readjustment. At its option,
the holder of a Warrant may confirm the adjustment noted on the certificate by
causing such adjustment to be computed by an independent certified public
accountant at the expense of the Company.

      Section 10. Notices of Record Date. In the event of:

            (a) any 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 or other distribution, or any right
      to subscribe for, purchase or otherwise acquire any shares of stock or
      other securities of any class or property, or to receive any other right;
      or

            (b) any capital reorganization of the Company, any reclassification
      or recapitalization of the capital stock of the Company or any transfer of
      all or substantially all the assets of the Company to or any consolidation
      or merger of the Company with or into any other Person; or

            (c) any voluntary or involuntary dissolution, liquidation or
      winding-up of the Company,

then, in each such event occurring during the Adjustment Period, the Company
will mail or cause to be mailed to the Holder, no later than three days prior to
such event, a notice specifying (a) the date on which any such record is to be
taken for the purpose of such dividend, distribution or right, and stating the
amount and character of such dividend, distribution or right, and (b) the date
on which any such reorganization, reclassification, recapitalization, transfer,
consolidation, merger, dissolution,

<PAGE>
                                      -7-

liquidation or winding-up is anticipated to take place, and the time, if any is
to be fixed, as of which the holders of record of Shares (or Other Securities)
shall be entitled to exchange their Shares (or Other Securities) for securities
or other property deliverable on such reorganization, reclassification,
recapitalization, transfer, consolidation, merger, dissolution, liquidation or
winding-up.

      Section 11. Reservation of Shares Issuable on Exercise of Warrant.
Sufficient shares of authorized but unissued Common Stock of the Company have
been reserved by appropriate action in connection with the prospective exercise
of the Warrant. The Company represents and warrants that the issuance of the
Warrant or the Warrant Shares will not require any further action by the
stockholders of the Company, will not be subject to pre-emptive rights in any
present or future stockholders of the Company and will not conflict with any
provision of any agreement to which the Company is a party or by which it is
bound, and such Shares, when issued upon exercise of the Warrant in accordance
with their terms or upon such conversion, will be duly authorized, fully paid
and non-assessable and will be free and clear of any liens or encumbrances;
provided, however, that the Shares shall be subject to restrictions on transfer
under state and/or federal securities laws and pursuant to the terms of the
Stockholders' Agreement.

      Section 12. No Rights or Responsibilities as Stockholder. This Warrant
neither entitles the Holder to any rights, nor subjects the Holder to any
responsibilities, as a stockholder of the Company.

      Section 13. Exchange. This Warrant is exchangeable, upon the surrender
hereof by the registered holder at the principal office of the Company, for new
warrants of like tenor and date representing in the aggregate the right to
purchase the number of Warrant Shares purchasable hereunder, each of such new
warrants to represent the right to purchase such number of Warrant Shares as
shall be designated by said registered holder at the time of such surrender.

      Section 14. 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 it (which may
be the unsecured agreement of the Holder to indemnify the Company for any loss
on account thereof), 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 date, in lieu of this Warrant.

      Section 15. Remedies. The Company stipulates that the remedies at law of
the Holder in the event of any default or threatened default by the Company in
the performance of or compliance with any of the terms of this Warrant are not
and will not be adequate, and that such terms may be specifically enforced by a
decree for the specific performance of any agreement contained herein or by an
injunction against a violation of any of the terms hereof or otherwise.

      Section 16. Transfer of Warrant. Neither this Warrant nor the rights
hereunder are transferable by the Holder; provided that the Holder may transfer
this Warrant to a direct or indirect subsidiary owned 80% or more (with respect
to both voting and economic interests) by the Holder.

<PAGE>
                                      -8-

      Section 17. Amendments and Waivers. Any term of this Warrant may be
amended only with the written consent of the Company and the Holder. Any
amendment or waiver effected in accordance with this Section 17 shall be binding
upon the Company and the Holder.

      Section 18. Communications and Notices. All communications and notices
hereunder must be in writing, either delivered in hand or sent by first-class
mail, postage prepaid, or sent by telecopier, and, if to the Company, shall be
addressed to it at the address set forth on the first page hereof, or at such
other address as the Company may hereafter designate in writing by notice to the
registered Holder, and, if to such registered Holder, addressed to such Holder
at the address of such Holder as shown on the books of the Company.

      Section 19. Sundays, Holidays, etc. If the last or appointed day for the
taking of any action required or the expiration of any right granted herein
shall be a Sunday or a Saturday or shall be a legal holiday or a day on which
banking institutions in Boston, Massachusetts are authorized or required by law
to remain closed, then such action may be taken or right may be exercised on the
next succeeding day which is not a Sunday, a Saturday or a legal holiday and not
a day on which banking institutions in Boston, Massachusetts are authorized or
required by law to remain closed.

      Section 20. Miscellaneous.

      (a) THIS WARRANT SHALL BE BINDING UPON THE COMPANY'S SUCCESSORS AND
ASSIGNS. THIS WARRANT SHALL CONSTITUTE A CONTRACT UNDER SEAL AND, FOR ALL
PURPOSES, SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE
COMMONWEALTH OF MASSACHUSETTS.

      (b) For all purposes of this Warrant, the Holder shall be bound by all of
the terms and conditions contained in, and entitled to all of the benefits of,
this Warrant.

      IN WITNESS WHEREOF, PAPEREXCHANGE.COM, INC. has caused this PARTICIPATION
WARRANT to be signed in its corporate name and its corporate seal to be
impressed hereon by its duly authorized officers.

                                          The Company:

Dated as of:                              PAPEREXCHANGE.COM, INC.

March 7, 2000

                                          By: /s/ Duane DeSisto
                                              ----------------------------------
                                          Name: Duane DeSisto
                                                --------------------------------
                                          Title: Chief Financial Officer
                                                 -------------------------------

Attest:

-------------------------

<PAGE>
                                      -9-

                                                                      Schedule 1

                          MEASURING PERIODS AND TONNAGE

--------------------------------------------------------------------------------
                                                    Maximum Whole
                                                       Tons of
           Measuring Period                        Cut Sheet Paper
--------------------------------------------------------------------------------
April 1, 2000 through June 30, 2000                      *****
--------------------------------------------------------------------------------
July 1, 2000 through September 30, 2000                  *****
--------------------------------------------------------------------------------
October 1, 2000 through December 31, 2000                *****
--------------------------------------------------------------------------------
January 1, 2001 through March 31, 2001                   *****
--------------------------------------------------------------------------------
April 1, 2001 through June 30, 2001                      *****
--------------------------------------------------------------------------------
July 1, 2001 through September 30, 2001                  *****
--------------------------------------------------------------------------------
October 1, 2001 through December 31, 2001                *****
--------------------------------------------------------------------------------
January 1, 2002 through March 31, 2002                   *****
--------------------------------------------------------------------------------
                                           TOTAL:        *****
--------------------------------------------------------------------------------

* Confidential Treatment Requested: material has been omitted and filed
  separately with the Commission.

<PAGE>
                                      -10-

                                                                       Exhibit A

                              FORM OF SUBSCRIPTION

(To be signed only on exercise of Participation Warrant)

TO: PAPEREXHANGE.COM, INC.

      The undersigned, the registered Holder of the within Participation Warrant
of PaperExhange.com, Inc., hereby irrevocably elects to exercise this
Participation Warrant for, and to purchase thereunder, _____* Shares of
PaperExchange.com, Inc. and the undersigned herewith makes payment of $_______
therefor.

Dated:
      ------------------                ----------------------------------------
                                        (Signature must conform in all
                                        respects to name of registered
                                        holder as specified on the face
                                        of the Warrant)

                                        ------------------------------
                                        (Address)

Signed in the presence of:

--------------------------

----------

      *Insert here the number of shares (all or part of the number of shares
called for in the Participation Warrant) as to which the Participation Warrant
is being exercised without making any adjustment for any other stock or other
securities or property or cash which, pursuant to the adjustment provisions of
the Participation Warrant, may be deliverable on exercise.

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