EX-24

Designated Filer: Davis, Cary
Issuer & Ticker Symbol:   NYFIX, Inc. (NYFX)
Date of Event Requiring Statement: March 7, 2008
                                                                      Exhibit 24


                                POWER OF ATTORNEY

     The undersigned hereby constitutes and appoints each of Scott A. Arenare,
Timothy J. Curt and Steven G. Schneider, acting together or individually,
his/her true and lawful attorneyin-fact to:

(1)  execute for and on behalf of the undersigned Forms 3, 4 and 5, together
     with any amendments thereto, in accordance with the Securities Exchange Act
     of 1934, as amended, and the rules thereunder;

(2)  do and perform any and all acts for and on behalf of the undersigned which
     may be necessary or desirable to complete the execution of any such Forms
     and the filing thereof with the United States Securities and Exchange
     Commission and any other person as may be required by law; and

(3)  take any other action of any type whatsoever in connection with the
     foregoing which, in the opinion of such attorney-in-fact, may be of benefit
     to, in the best interest of, or legally required by, the undersigned, it
     being understood that the documents executed by such attorney-in-fact on
     behalf of the undersigned pursuant to this power of attorney shall be in
     such form and shall contain such terms and conditions as such
     attorney-in-fact may approve in his discretion.

     The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, with full power of substitution or revocation, hereby ratifying
and confinning all that such attorney-in-fact, or his substitute or substitutes,
shall lawfully do or cause to be done by virtue of this power of attorney and
the rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneysin-fact, in serving in such capacity at the request of the
undersigned,_ are not assuming any of the undersigned's responsibilities to
comply with the Securities Exchange Act of 1934, as amended.

     This power of attorney shall continue in full force and effect until
revoked in writing by the undersigned or his/her attorney-in-fact.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 15th day of May, 2004.



                                   /s/ Cary J. Davis
                                   ----------------------------------
                                   Print Name: Cary J. Davis

EX-99

Designated Filer: Davis, Cary
Issuer & Ticker Symbol:   NYFIX, Inc. (NYFX)
Date of Event Requiring Statement: March 7, 2008


                                                                    Exhibit 99.1

                            Explanation of Responses:


(1) Following the purchases on March 7 and 10, 2008 of the common stock, par
value $0.001 per share ("Common Stock") of NYFIX, Inc. (the "Issuer"), Warburg
Pincus Private Equity IX, L.P., a Delaware limited partnership ("WP IX") is the
direct record owner of 2,789,427 shares of Common Stock and 1,500,000 shares of
the Series B Voting Convertible Preferred Stock (the "Preferred Stock"), which
is convertible into 15,000,000 shares of Common Stock. The sole general partner
of WP IX is Warburg Pincus IX, LLC, a New York limited liability company ("WP IX
LLC"); Warburg Pincus Partners, LLC, a New York limited liability company ("WPP
LLC"), is the sole member of WP IX LLC; Warburg Pincus & Co., a New York general
partnership ("WP"), is the managing member of WPP LLC; Warburg Pincus LLC, a New
York limited liability company ("WP LLC"), manages WP IX; and Charles R. Kaye
and Joseph P. Landy are each Managing General Partners of WP and Co-Presidents
and Managing Members of WP LLC. By reason of the provisions of Rule 16a-1 of the
Securities Exchange Act of 1934, as amended (the "Act"), WP, WP LLC, WPP LLC, WP
IX LLC, Mr. Kaye and Mr. Landy may be deemed to be the beneficial owners of any
securities that may be deemed to be beneficially owned by W P IX. Each of WP, WP
LLC, WPP LLC, WP IX LLC, Mr. Kaye and Mr. Landy disclaim beneficial ownership of
all shares of the Common Stock and Preferred Stock beneficially owned by WP IX,
except to the extent of any indirect pecuniary interest therein.

Mr. Davis, who became a director of the Issuer on October 12, 2006, is a partner
of WP, and a Member and Managing Director of WP LLC. As such, Mr. Davis may be
deemed to have an indirect pecuniary interest (within the meaning of Rule 16a-1
of the Act) in an indeterminate portion of the securities reported as
beneficially owned by WP IX. Mr. Davis disclaims beneficial ownership of such
securities, except to the extent of any indirect pecuniary interest therein. Mr.
Davis does not directly own any shares of Common Stock or Preferred Stock.

(2) Each share of Preferred Stock is initially convertible into 10 shares of
Common Stock at an initial conversion price of $5.00 per share, subject to
certain adjustments in accordance with the terms of the Preferred Stock.

(3) The Preferred Stock is convertible, in whole or in part, at any time and
from time to time at the holder's election. At any time after April 12, 2008,
the Preferred Stock is convertible at the option of the Issuer, in whole or in
part, if the price per share of the Common Stock reaches certain levels. The
conversion rights do not expire.

(4) The exercise price of the Warrant to Purchase Common Stock (the "Warrant")
is initially equal to $7.75 per share of Common Stock, subject to certain
adjustments in accordance with the terms of the Warrant.

(5) The Warrant is convertible at any time, in whole or in part, at the holder's
option until 5:00 p.m. Eastern Time on October 12, 2016, at which point the
Warrant expires.

(6) WP IX is the direct record owner of the Warrant, which is convertible into
2,250,000 shares of Common Stock. The sole general partner of WP IX is WP IX
LLC; WPP LLC is the sole member of WP IX LLC; WP is the managing member of WPP
LLC; WP LLC manages WP IX; and Charles R. Kaye and Joseph P.Landy are each
Managing General Partners of WP and Co-Presidents and Managing Members of WP
LLC. By reason of the provisions of Rule 16a-1 of the Act, WP, WP LLC, WPP LLC,
WP IX LLC, Mr. Kaye and Mr. Landy may be deemed to be the beneficial owners of
any securities that may be deemed to be beneficially owned by WP IX. Each of WP,
WP LLC, WPP LLC, WP IX LLC, Mr. Kaye and Mr. Landy disclaim beneficial ownership
of the Warrant beneficially owned by WP IX, except to the extent of any indirect
pecuniary interest therein.

Mr. Davis, who became a director of the Issuer on October 12, 2006, is a partner
of WP, and a Member and Managing Director of WP LLC. As such, Mr. Davis may be
deemed to have an indirect pecuniary interest (within the meaning of Rule 16a-1
of the Act) in the Warrant reported as beneficially owned by WP IX. Mr. Davis
disclaims beneficial ownership of the Warrant, except to the extent of any
indirect pecuniary interest therein. Mr. Davis does not directly own the
Warrant.