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 quarterly report of eSpeed, Inc., a Delaware corporation
(the "Company") on Form 10-Q for the period ended June 30, 2003 as filed with
the Securities and Exchange Commission on the date hereof (the "Form 10-Q"),
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-Q 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-Q 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: August 11, 2003                     Date: August 13, 2003