Exhibit 32


                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                       AS ADOPTED PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002


In connection with the annual report of eSpeed, Inc., a Delaware corporation
(the "Company"), on Form 10-K for the period ended December 31, 2003 as filed
with the Securities and Exchange Commission on the date hereof (the "Form
10-K"), each of Howard W. Lutnick, Chief Executive Officer of the Company, and
Jeffrey M. Chertoff, Chief Financial Officer of the Company, certifies, pursuant
to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that to his knowledge:

(1)      The Form 10-K fully complies with the requirements of Section 13(a) or
         15(d) of the Securities Exchange Act of 1934; and

(2)      The information contained in the Form 10-K fairly presents, in all
         material respects, the financial condition and results of operations of
         the Company.



/s/ Howard W. Lutnick                     /s/ Jeffrey M. Chertoff
----------------------------------        --------------------------------------
Name: Howard W. Lutnick                       Name: Jeffrey M. Chertoff
Title: Chairman of the Board,                 Title: Senior Vice President and
Chief Executive Officer and President         Chief Financial Officer
Date: March 12, 2004                          Date: March 12, 2004