EXHIBIT 99.1

                             JOINT FILING AGREEMENT

           JOINT FILING AGREEMENT (this " Agreement"),  dated as of May 9, 2005,
among Sigma Opportunity Fund, LLC, Sigma Capital Advisors, LLC and Sigma Capital
Partners,  LLC , each a New  York  limited  liability  company,  and  Thom  Waye
(collectively, the "Joint Filers").

                                   WITNESSETH
                                   ----------

         WHEREAS,  as of the date  hereof,  each of the Joint Filers is filing a
Schedule 13D under the Securities Exchange Act of 1934 (the "Exchange Act") with
respect to securities of Direct Insite Corp. (the "Schedule 13D");

         WHEREAS,  each of the Joint Filers is individually eligible to file the
Schedule 13D;

         WHEREAS,  each of the Joint Filers  wishes to file the Schedule 13D and
any  amendments  thereto  jointly  and on behalf  of each of the  Joint  Filers,
pursuant to Rule 13d-1(k)(1) under the Exchange Act;

         NOW,  THEREFORE,  in consideration of these premises and other good and
valuable consideration, the parties hereto agree as follows:

         1. The Joint  Filers  hereby  agree that the  Schedule  13D is, and any
amendments thereto will be, filed on behalf of each of the Joint Filers pursuant
to Rule 13d-1(k)(1)(iii) under the Exchange Act.

         2. Each of the Joint Filers hereby  acknowledges that, pursuant to Rule
13d-1(k)(1)(i)  under the Exchange Act, it is responsible  for the timely filing
of the Schedule 13D and any amendments  thereto,  and for the  completeness  and
accuracy  of  the  information  concerning  it  contained  therein,  and  is not
responsible for the completeness and accuracy of the information  concerning any
of the other parties  contained  therein,  unless it knows or has reason to know
that such information is inaccurate.

         3. Each of the Joint Filers hereby agrees that this Agreement  shall be
filed as an exhibit to the Schedule 13D, pursuant to Rule 13d-1(k)(1)(iii) under
the Exchange Act.

         IN WITNESS  WHEREOF,  the  parties  have caused  this  Agreement  to be
executed  individually or by their respective directors hereunto duly authorized
as of the day and year first above written.

                                    SIGMA OPPORTUNITY FUND, LLC
                           BY:      SIGMA CAPITAL ADVISORS, LLC

                                    /S/ THOM WAYE
                                    ---------------
                                    Thom Waye, Manager


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                                    SIGMA CAPITAL ADVISORS, LLC

                                     /S/ THOM WAYE
                                    ---------------
                           BY:      Thom Waye, Manager

                                    SIGMA CAPITAL PARTNERS, LLC


                                     /S/ THOM WAYE
                                    ---------------
                           BY:      Thom Waye, Sole Member


                                     /S/ THOM WAYE
                                    ---------------
                                    Thom Waye


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