Document:

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                                                                    EXHIBIT 4.10

             SCHEDULE OF WARRANTS ISSUED (GFP SERIES AND BCP SERIES)

<TABLE>
<CAPTION>

DATE OF          NAME OF WARRANT RECIPIENT          WARRANT         NUMBER OF           EXERCISE PRICE
ISSUANCE                                            NO.             SHARES OF           EXPIRATION DATE
                                                                    COMMON STOCK

<S>              <C>                                 <C>            <C>                 <C>
    11/3/99      Gulfstream Financial Partners       GFP-13                 250,000     Exercise price $2.00
                 2401 PGA Boulevard, Suite 190                                          Expires 4/28/04
                 Palm Beach Gardens, FL 33410

    11/3/99      Blake Capital Partners, LLC         GFP-14                 250,000     Exercise price $2.00
                                                                                        Expires 4/28/04

    12/2/99      Gulfstream Financial Partners       GFP-14(2)              500,000     Exercise price $1.50
                                                                                        Expires 12/2/2004

    12/1/99      Henry Fong, Jr.                     GFP-15a                 50,000     Exercise price $1.625
                                                                                        Expires 12/1/2004

    12/1/99      Lauren Fong                         GFP-15b                 50,000     Exercise price $1.625
                                                                                        Expires 12/1/2004

    12/1/99      Benjamin Private School             GFP-15c                 50,000     Exercise price $1.625
                 Fed I.D.:  59-1536502                                                  Expires 12/1/2004

    12/1/99      Barry Hollander                     GFP-15d                 50,000     Exercise price $1.625
                                                                                        Expires 12/1/2004

    12/1/99      Gulfstream Financial Partners,      GFP-15e                150,000     Exercise price $1.625
                 LLC                                                                    Expires 12/1/2004

    12/2/99      Blake Capital Partners              BCP-1                  500,000     Exercise price $1.625
                                                                                        Expires 12/1/2004

   2/9/2000      Blake Capital Partners              BCP-2                  150,000     Exercise price $2.25
                                                                                        Expires 2/9/2005

  4/18/2000      Blake Capital Partners              BCP-3                  250,000     Exercise price $2.00
                                                                                        Expires 4/18/2005

</TABLE><PAGE>   1
                                                                     EXHIBIT 4.1

                        FORM OF COMMON STOCK CERTIFICATE
===============================================================================
NUMBER                                                                 SHARES
CHEM
    -------                                                            -----
                              [CHEMATCH.COM LOGO]

SEE REVERSE FOR STATEMENTS                             CUSIP 163571 10 2
RELATING TO RIGHTS, PREFERENCES,             SEE REVERSE FOR CERTAIN DEFINITIONS
PRIVILEGES AND RESTRICTIONS, IF ANY

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE
       -------------------------------------------------------------------

            THIS CERTIFIES THAT

            is the record holder of

       -------------------------------------------------------------------
              FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK,
                          $0.01 PAR VALUE PER SHARE, OF

               =============== CHEMATCH.COM, INC. ===============

transferable only on the books of the Corporation by the holder hereof in person
or by duly authorized Attorney upon surrender of this certificate properly
endorsed. This certificate is not valid until countersigned by the Transfer
Agent and Registrar.

     WITNESS the facsimile signatures of its duly authorized officers.

Dated:
                                      [SEAL]
          /s/ LARRY W. McAFEE                      /s/ CARL D. McCUTCHEON
CHIEF FINANCIAL OFFICER AND SECRETARY       CHAIRMAN AND CHIEF EXECUTIVE OFFICER

COUNTERSIGNED AND REGISTERED:
     AMERICAN STOCK TRANSFER AND TRUST COMPANY
            (New York, New York)
                                                                  Transfer Agent
                                                                  and Registrar

By
                                                            Authorized Signature
================================================================================

<PAGE>   2
                               CHEMATCH.COM, INC.

     The Corporation will furnish without charge to each stockholder who so
requests a statement of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series
thereof, and the qualifications, limitations and restrictions of such
preferences and/or rights. Such statement may be obtained by a request in
writing to the Secretary of the Corporation at its corporate headquarters.

     KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED,
THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE
OF A REPLACEMENT CERTIFICATE.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations;

<TABLE>
<S> <C>
TEN COM - as tenants in common           UNIF GIFT MIN ACT-              Custodian
TEN ENT - as tenants by the entities                        ------------           --------------
JT TEN  - as joint tenants with right                          (Cust)                 (Minor)
          of survivorship and not as
          tenants in common                                under Uniform Gifts to Minors

                                                          Act
                                                             -----------------------------------
                                                                          (State)

                                        UNIF TRF MIN ACT-               Custodian (until age ___)
                                                           ------------
                                                              (Cust)

                                                                         under Uniform Transfers
                                                           -------------
                                                             (Minor)

                                                           to Minors Act
                                                                        -------------------------
                                                                                (State)

    Additional abbreviations may also be used though not in the above list.

For Value Received, _____________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
--------------------------------------

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

-------------------------------------------------------------------------------
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE(S))

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

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

------------------------------------------------------------------------------- Shares
of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint __________________________________________ Attorney,
to transfer the said stock on the books of the within named Corporation with full
power of substitution in the premises.

Dated
     --------------------------------   ---------------------------------------
                                        NOTICE: THE SIGNATURE(S) TO THIS
In presence of                          ASSIGNMENT MUST CORRESPOND WITH THE
                                        NAME(S) AS WRITTEN UPON THE FACE OF THIS
                                        CERTIFICATE IN EVERY PARTICULAR, WITHOUT
                                        ALTERATION OR ENLARGEMENT, OR ANY CHANGE
                                        WHATSOEVER.

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

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

Signature(s) Guaranteed

By
  ----------------------------------------------------------------
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND
CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM) PURSUANT TO S.E.C. RULE 17 Ad-15.
</TABLE><PAGE>   1

                                                                   EXHIBIT 10.23

                             AMENDMENT TO AGREEMENT

         WHEREAS, CheMatch.com, Inc. (formerly known as PetroChemNet Holdings,
Inc.), hereinafter "PCN, CheMatch, or the Company" and E.I. duPont de Nemours
and Company, hereinafter "DuPont", entered into a certain Strategic Alliance
Agreement dated November 11, 1999; and

         WHEREAS, CheMatch and DuPont have agreed to certain amendments and
clarifications to such Strategic Alliance Agreement;

         NOW THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, CheMatch and DuPont agree as
follows:

1.       Paragraph 2(b) of the Strategic Alliance Agreement is hereby deleted in
         its entirety and the following substituted therefor:

         (b)      DuPont will work with CheMatch to add those potential
                  customers agreed by the parties to the customers using the
                  CheMatch platform of CheMatch for trading products. For each
                  such customer up to a maximum of 20 customers, that completes
                  at least five (5) transactions with parties other than DuPont
                  on the CheMatch platform prior to December 31, 2000 at the
                  standard rates charged for the use of the CheMatch platform,
                  DuPont shall earn a commission of $100,000. In lieu of a cash
                  payment , DuPont will use such commission to purchase a number
                  of shares of Common Stock of CheMatch equal to such $100,000,
                  divided by the Fair Market Value per share of Common Stock.
                  Additionally, for each such customer that completes at least
                  four (4) transactions or transacts notional value equal to or
                  greater than $3,000,000 in a minimum of two (2) transactions
                  (including auctions or reverse auctions) with DuPont prior to
                  December 31, 2000, at the standard rates charged for the use
                  of the CheMatch platform, DuPont will earn a commission of
                  $50,000. In lieu of a cash payment, DuPont will use such
                  commission to purchase a number of shares of Common Stock of
                  CheMatch equal to such $50,000, divided by the Fair Market
                  Value per share of Common Stock. For the purposes of this
                  paragraph 2(b), "Fair Market Value" shall mean (i) the price
                  per share paid for the Series C Preferred Stock until the date
                  120 days from 1 December 1999, or (ii) thereafter, the per
                  share price based on the most recent transaction value or
                  appraisal, if CheMatch has not completed its initial public
                  offering, or if CheMatch has completed its initial public
                  offering, the closing price of CheMatch's Common Stock on the
                  date of the fourth trade or the date of the transacted
                  notional value is equal to or greater than $3,000,000 in a
                  minimum of two transactions meeting the conditions set forth
                  above. Provided that, in no event shall the commissions earned
                  pursuant to this paragraph exceed in the aggregate $2,000,000,
                  nor the total of Common Stock of CheMatch owned by DuPont
                  exceed 10% of the "fully diluted" common stock as described in
                  paragraph 2(c) below.

<PAGE>   2

2.       Except as amended hereby, the Strategic Alliance Agreement dated
         November 11, 1999 by and between CheMatch and DuPont remain in full
         force and effect.

ACCEPTED AND AGREED this 20th day of March, 2000.

CHEMATCH.COM, INC.                          E. I. DUPONT DENEMOURS AND CO.

By:   /s/ Fred B. Cook                      By:    /s/ S.A. Hamdan
   --------------------------------            ---------------------------------
Name:     Fred B. Cook                      Name:      S.A. Hamdan
Title:    Senior Vice President             Title:     Director

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