Document:

Exhibit 4.13

                                Master Agreement
                                     Between
             Cable & Wireless PLC and Internet Commerce Corporation

The Parties, Cable & Wireless PLC (C&W) and Internet Commerce Corporation (ICC),
have  determined   that  there  exists   substantial   synergies   between  both
organizations  to expand  their  respective  market  efforts for  Internet-based
services. As such, the Parties have agreed to this Master Agreement as the basis
for a resulting  commercial  relationship.  This Master  Agreement is subject to
both  Parties  obtaining  their  respective   Management  or  Supervisory  Board
approval, and, if relevant, regulatory approvals.  Notwithstanding delays due to
public holidays,  the Parties respective Board approvals will be obtained within
30 days after the  execution  of this Master  Agreement.  Other than those terms
explicitly  outlined herein, no  representations  or warranties are expressed or
implied.  All  co-signed  Addendums  shall be agreed  upon within 30 days of the
execution  of  this  Agreement  and  will be  deemed  integral  to  this  Master
Agreement.

1)       STOCK PURCHASE AND RELATED TRANSACTIONS

a)   C&W shall invest US ten million  ($10,000,000.00)  dollars in ICC. For good
     and  valuable  consideration  of this  investment,  ICC shall  issue to C&W
     10,000 Shares of Series C Convertible  Preferred  Stock in ICC. The closing
     of the  transaction  will  occur  within  10  days  after  receiving  Board
     approvals.

b)   The Series C Preferred Stock issued to C&W by ICC shall be convertible into
     Class A Common Stock. Each share of Series C Preferred Stock is convertible
     into a number of shares of Class A Common Stock determined by the following
     formula: $1,000.00 divided by the daily average of the closing bid price of
     ICC Common  Stock for the five (5) trading  days prior to the  execution of
     this Master Agreement plus $0.13 per share (the "Conversion Price").

     The Series C Preferred Stock has a value of $1,000.00. The conversion price
     will be adjusted for stock splits, dividends and combinations,  mergers and
     consolidations.

c)   The per share voting rights of the Series C Preferred  Stock shall be equal
     to that of the  number  of shares of Class A Common  Stock  into  which the
     Series  C  Preferred  Stock  is  convertible.  At all  times  the  Series C
     Preferred Stock held by C&W shall vote as one class with ICC Class A Common
     Stock. The Series C Preferred Stock shall be entitled to receive cumulative
     dividends at a rate equal to 4% per share (as adjusted for subsequent stock
     dividends,  splits,  recapitalizations  and  similar  transactions).   Such
     dividends  shall accrue whether or not declared and shall be paid in either
     cash or shares of ICC Class A Common Stock at ICC's option;  provided, that
     such dividends are paid prior to and in preference to any distribution with
     respect to the shares of Common Stock.

d)   The Series C Preferred Stock issued to C&W shall have liquidation  priority
     and  preference  over any and all classes and series of ICC Capital  Stock.
     The  liquidation  value shall equal  $1,000.00  per share plus  accrued and
     unpaid dividends.

e)   At the closing,  ICC shall issue  400,000  warrants for ICC Class A Common.
     The exercise price for such warrants shall be the  Conversion  Price,  less
     $0.13 per share, as may be adjusted (the "Warrant Price"), and the warrants
     shall have an initial term of 5 years from the date of issuance.

f)   ICC  agrees  to issue to C&W  additional  stock for the  attainment  of set
     quarterly  revenue  targets  for the sales of ICC  services.  The number of
     Shares in connection with this section 1(f) shall be equal to the result of
     multiplying  the gross amount of sales for ICC services  sold by C&W by 5%.
     The shares will be priced by the daily  average of the closing bid price of
     ICC stock for the 5 days  prior to the end of each  quarter.  The basis for
     the revenue  calculation  will be derived from the  commissionable  revenue
     figure to be negotiated in the Reseller  Addendums.  Each outstanding share
     of the  Series  C  Preferred  Stock  is  redeemable  by ICC at a  price  of
     $1,000.00 per share, plus any accrued and unpaid dividends (the "Redemption
     Price"),  commencing  on the  fifth  anniversary  of the  date of  issuance
     thereof upon written notice to the holders of Series C Preferred  Stock. No
     such  redemption  shall  diminish  C&W's  right  to  convert  the  Series C
     Preferred Stock prior to the redemption date.

<PAGE>
                                Master Agreement
                                     Between
             Cable & Wireless PLC and Internet Commerce Corporation

g)   C&W shall have  right of first  refusal  to  participate  in any ICC equity
     offering, on the same terms and conditions as other purchasers, to maintain
     its percentage ownership of ICC.

h)   In  exchange  for C&W  investment  in ICC and for other  good and  valuable
     consideration,  ICC shall grant C&W one seat on ICC's Board. ICC's approval
     of the C&W candidate will not be unreasonably  withheld. In the event ICC's
     Board  increases  to  more  than  nine  members,  ICC  shall  grant  C&W an
     additional seat on ICC's Board. ICC agrees that C&W's Board  representation
     shall  at no time  be  less  than  one  seat  and  shall  increase  roughly
     proportionate  to  C&W's  percentage  ownership  of ICC as such  percentage
     ownership may increase.

i)   At the time of the  issuance of the shares  provided  for in section 1, the
     parties will enter into a Registration  Rights  Agreement  providing demand
     and piggyback  registration  rights with respect to all shares of Preferred
     and Common Stock issued to C&W  pursuant to this Master  Agreement  and all
     shares issued upon the  conversion of the Preferred  Stock and the exercise
     of the Warrants.

j)   ICC represents and warrants that the  information  contained in its private
     placement memorandum dated October 1999 is true and correct in all material
     respects;  that such  private  placement  memorandum  does not  contain any
     untrue  statements  of  material  fact or omit to state any  material  fact
     required to make the statements therein not misleading;  and that there has
     been no material changes in the business,  properties,  financial condition
     or results of operations of ICC. In addition,  ICC  represents and warrants
     that the products  described therein are all currently  available for sale.
     However, statements included in such private placement memorandum which are
     not historical in nature are  forward-looking  statements  made pursuant to
     the safe harbor provisions of the Private Securities  Litigation Reform Act
     of 1995 including, without limitation,  statements regarding the ability to
     obtain  financing,  the hiring of new personnel,  the Company's  ability to
     secure new business,  and those factors  highlighted  in Internet  Commerce
     Corporation's  Annual  Reports on Form 10-K and  Quarterly  Reports on Form
     10-Q, which could cause the Company's  actual results to materially  differ
     from forward-looking statements made by the Company.

2)       COMMERCIAL ACTIVITIES

a)   The scope of this Agreement is intended to be global in nature and as such,
     ICC  and C&W  shall  endeavor  to  address  the  global  markets  together.
     Therefore,  ICC will utilize C&W IP and data  networks  and other  services
     (including hosting) to the greatest extent possible,  consistent with ICC's
     needs for redundant facilities, at rates no higher than C&W lowest rates to
     comparable customers.  C&W intention is to use ICC EDI services on a global
     basis.

b)   The Parties agree that the initial focus shall be on North America, Western
     Europe,  and Japan, with other C&W market activities to follow as resources
     allow.

c)   C&W will serve as a sales  channel  for ICC,  and ICC will serve as a sales
     channel  for C&W,  as either a  reseller  or as an agent and as C&W and ICC
     shall mutually agree. ICC, at ICC's sole expense, shall co-locate dedicated
     sales and  support  personnel  at mutually  determined  C&W  facilities  as
     requested by C&W Global Markets and which is reasonably  required to attain
     the sales  goals  referred  to in section  2(e)  herein.  C&W shall seek to
     provide  office  space and related  support to ICC as may be  required  for
     these  activities.  For the first 12 months of this Master  Agreement,  C&W
     agrees to consider the provision of these  services to be in-kind  funding.
     Thereafter,  the cost associated with office provision and support shall be
     negotiated country by country.

d)   ICC shall  compensate  C&W for each sale of ICC services  made by C&W sales
     representatives  as will C&W  compensate  ICC for each sale of C&W services
     made by ICC sales  representatives.  For compensation purposes

<PAGE>

                                Master Agreement
                                     Between
             Cable & Wireless PLC and Internet Commerce Corporation

     only, in the case where the Parties jointly make sales calls, Parties shall
     split commissions on a basis to be mutually agreed upon.

<PAGE>

                                Master Agreement
                                     Between
             Cable & Wireless PLC and Internet Commerce Corporation

e)   The  Parties  shall  jointly  develop a Global  Schedule  of  Services  and
     Compensation (GSSC) that shall determine the service offerings, MFN pricing
     structures  and  resulting  compensation  values.  Subject to mutual  prior
     consent, which consent will not be unreasonably withheld, the Parties shall
     be entitled to bundle the other's  products  with any product  offer either
     Party may develop. The GSSC shall include bundled service offerings wherein
     the Parties will determine the percentage of revenues  attributable to each
     Party's  contribution  to the offering in order to calculate the applicable
     compensation.  The GSSC  shall  be  incorporated  into  this  Agreement  by
     reference and the Parties  shall agree on any  deviation  from the terms of
     the GSSC in advance.

f)   ICC shall cooperate with C&W Global Operations to jointly develop and agree
     upon a sales and market plan (SMP) for each global region  enumerated above
     in section  2(b)  herein.  The SMP shall  include  reasonable  sales goals,
     existing  customer  lead  activity,   new  customer   acquisition  targets,
     co-located ICC support headcount  requirements and other issues that may be
     required  for the Parties to reach their sales goals  during the first year
     of the  Agreement.  The SMP shall be reviewed by the Parties on a quarterly
     basis and measured against performance.  Modifications mutually agreed upon
     as a  result  of  such  reviews  shall  be  incorporated  into  the  SMP as
     appropriate  from  time to time.  The SMP shall be  incorporated  into this
     Agreement by reference and the Parties  shall agree on any  deviation  from
     the terms of the SMP in advance.

g)   Where additional product development efforts are necessary to launch and/or
     support  bundled  offerings,  the Parties will cooperate in performing such
     additional efforts in a professional and timely manner. C&W may at its sole
     option  decline such request and ICC may decline such request if C&W is not
     meeting sales targets  established  and agreed to in the SMP  referenced in
     section 2(e) above.

3)       LENGTH OF TERM

a)   The Initial  Period of this Master  Agreement  shall commence upon the date
     that both Parties receive the executed Master  Agreement and shall continue
     for a period of one (1) year. At C&W sole  discretion,  the Agreement shall
     automatically renew on each anniversary thereof for additional one (1) year
     Periods.  Should C&W wish to  terminate  this  Master  Agreement,  a 60 day
     written notification is required.

b)   During all Periods,  C&W shall be ICC's  exclusive  Tier 1 provider for the
     regions described in section 2(b) herein.  The Parties shall develop a Tier
     1 and Global  Competitor  List  (GCL)  that  shall  name those  competitors
     identified  and agreed by the  Parties.  ICC agrees  that it will not enter
     into an agreement with any entity identified and incorporated into the GCL.
     The GCL shall be  incorporated  into this  Agreement by  reference  and the
     Parties shall agree any modifications to the GCL in advance.

c)   Following the expiration of the Initial Period,  either Party, upon 60 days
     written  notice  prior to the  expiration  of any  subsequent  Period,  may
     terminate  the  Agreement for cause as shall be described in an Addendum to
     the Master  Agreement.  The  Parties  may at anytime  mutually  agree to an
     earlier  termination  date. In the event that either party is notified of a
     cause for  discontinuance,  the other  party  will have 60 days to cure the
     alleged fault. Should the cure be deemed inadequate,  the 60 day period for
     termination of service will begin.

d)   Notwithstanding  any other  provision  after  termination  of the Agreement
     should C&W desire to continue selling ICC's services, ICC agrees to provide
     C&W with MFN terms and conditions for all ICC's services.

<PAGE>

                                Master Agreement
                                     Between
             Cable & Wireless PLC and Internet Commerce Corporation

4)       MISCELLANEOUS

a)   The Parties will  co-develop  relevant MARCOM  materials.  C&W shall retain
     right of advance  approval of any and all  materials  bearing  reference to
     C&W. As well,  ICC shall  retain  right of advance  approval of any and all
     materials bearing reference to ICC. The Parties shall bear their individual
     costs of the  production of their own  materials.  Should ICC desire to use
     C&W MARCOM  materials,  such  materials in reasonable  quantities  shall be
     provided to ICC at C&W cost.  Should C&W wish to use or incorporate any ICC
     MARCOM materials,  it may do so with ICC's consent,  such consent not to be
     unreasonably denied.

b)   The  Parties  will  jointly   develop  and  mutually  agree  upon  a  press
     announcement  pertaining  to this  Master  Agreement.  Additionally,  it is
     agreed that both parties shall  jointly  prepare a PR Strategy for the next
     30, 60, 90 days of this relationship.

c)   C&W will  endeavor to provide  in-kind  support to ICC.  The Parties  shall
     agree on  pricing  and  terms ICC shall be  required  to pay to C&W  before
     commencement of such services will begin. A separate purchase agreement for
     such services will be executed as appropriate.

d) This  Master  Agreement  shall be  governed  by the laws and  subject  to the
jurisdiction of the Commonwealth of Virginia.

Cable & Wireless PLC                       Internet Commerce Corporation

Date: November 23, 1999                    Date: November 23, 1999

By: _________________________              By:__________________________
     Matthew Wolk                             Dr. Geoffrey S. Carroll
     Vice President Strategic Business        President and Chief Executive
     Development Global Operations            Officer<PAGE>

                                                                    Exhibit 4.03

     THIS WARRANT AND THE SECURITIES ISSUABLE UPON THE THIS WARRANT AND THE
     SECURITIES ISSUABLE UPON THE EXERCISE HEREOF HAVE NOT BEEN REGISTERED
     UNDER THE SECURITIES ACT OF 1933. THEY MAY NOT BE SOLD, OFFERED FOR SALE,
     PLEDGED, HYPOTHECATED, OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN
     EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, OR AN
     OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT REGISTRATION IS NOT
     REQUIRED UNDER SUCH ACT OR UNLESS SOLD PURSUANT TO RULE 144 UNDER SUCH ACT.

                                                                      Void after
                                                               November 18, 2003

                            STOCK PURCHASE WARRANT
                            ----------------------

     This Warrant is issued to ____________________ by DSL.net, Inc., a
Delaware corporation (the "Company"), pursuant to Section 13 of that certain
Stock Purchase Warrant, as amended (the "Old Warrant"), issued pursuant to that
certain Note and Warrant Purchase Agreement dated November 18, 1998, to purchase
shares of the Series A Preferred Stock, par value $.001 per share, of the
Company (the "Series A Preferred Stock"), wherein the Company agreed to issue a
new warrant to replace the Old Warrant upon the automatic conversion of the
Company's Series A Preferred Stock.  Upon issuance of this Stock Purchase
Warrant, the Old Warrant shall be null and void.

1.   Purchase of Shares.  Subject to the terms and conditions hereinafter set
     ------------------
forth and set forth in the Agreement, the holder of this Warrant is entitled,
upon surrender of this Warrant at the principal office of the Company (or at
such other place as the Company shall notify the holder hereof in writing), to
purchase from the Company up to _______ fully paid and nonassessable shares of
common stock, par value $.0005 per share, of the Company(the "Common Stock").
The shares of Common Stock issuable pursuant to this Section 1 (the "Shares")
shall also be subject to adjustment pursuant to Section 8 hereof.

2.   Purchase Price.  The purchase price for the Shares shall be $_______ per
     --------------
share, subject to adjustment pursuant to Section 8 hereof (such price, as
adjusted from time to time, is herein referred to as the "Exercise Price").

3.   Exercise Period.  This Warrant shall be exercisable until and including
     ---------------
November 18, 2003.

4.   Method of Exercise.  While this Warrant remains outstanding and exercisable
     ------------------
in accordance with Section 3 above, the holder may exercise, in whole or in
part, the purchase rights evidenced hereby.  Such exercise shall be effected by:

               (i)  the surrender of the Warrant, together with a duly executed
copy of the form of subscription attached hereto, to the Secretary of the
Company at its principal offices; and
<PAGE>

                                      -2-

               (ii) the payment to the Company of an amount equal to the
aggregate Exercise Price for the number of Shares being purchased.

5.   Net Exercise.  In lieu of cash exercising this Warrant, the holder of this
     ------------
Warrant may elect to receive shares equal to the value of this Warrant (or the
portion thereof being canceled) by surrender of this Warrant at the principal
office of the Company together with notice of such election, in which event the
Company shall issue to the holder hereof a number of shares of Common Stock
computed using the following formula:

                         Y (A-B)
                         -------
                    X=      A
Where

     X -- The number of shares of Common Stock to be issued to the holder of
          this Warrant.

     Y -- The number of shares of Common Stock purchasable under this Warrant.

     A -- The fair market value of one share of the Company's Common Stock.

     B -- The Exercise Price (as adjusted to the date of such calculations).

For purposes of this Paragraph 5, the fair market value of Common Stock shall
mean the average of the closing bid and asked prices of the Common Stock quoted
in the over-the-counter market in which the Common Stock is traded, or the
closing price quoted on any exchange on which the Common Stock is listed,
whichever is applicable, as published in the New York Edition of The Wall Street
                                                                 ---------------
Journal for the ten (10) trading days prior to the date of determination of fair
-------
market value (or such shorter period of time during which such stock was traded
over-the-counter or on such exchange).  If the Common Stock is not traded on the
over-the-counter market or on an exchange, the fair market value shall be the
price per share that the Company could obtain from a willing buyer for shares of
Common Stock sold by the Company from authorized but unissued shares, as such
prices shall be determined in good faith by the Company's Board of Directors.

6.   Certificates for Shares.  Upon the exercise of the purchase rights
     -----------------------
evidenced by this Warrant, one or more certificates for the number of Shares so
purchased shall be issued as soon as practicable thereafter, and in any event
within thirty (30) days of the delivery of the subscription notice.

7.   Issuance of Shares.  The Company covenants that the Shares, when issued
     ------------------
pursuant to the exercise of this Warrant, will be duly and validly issued, fully
paid and nonassessable and free from all taxes, liens, and changes with respect
to the issuance thereof.

8.   Adjustment of Exercise Price and Number of Shares.  The number of and kind
     -------------------------------------------------
of securities purchasable upon exercise of this Warrant and the Exercise Price
shall be subject to adjustment from time to time as follows:

               (a)  Subdivisions, Combinations and Other Issuances.  If the
                    ----------------------------------------------
Company shall at any time after October 12, 1999 and prior to the expiration of
this Warrant subdivide its
<PAGE>

                                      -3-

Common Stock, by split-up or otherwise, or combine its Common Stock, or issue
additional shares of its Preferred Stock or Common Stock as a dividend with
respect to any shares of its Common Stock, the number of Shares issuable on the
exercise of this Warrant shall forthwith be proportionately increased in the
case of a subdivision or stock dividend, or proportionately decreased in the
case of a combination. Appropriate adjustments shall also be made to the
purchase price payable per share, but the aggregate purchase price payable for
the total number of Shares purchasable under this Warrant (as adjusted) shall
remain the same. Any adjustment under this Section 8(a) shall become effective
at the close of business on the date the subdivision or combination becomes
effective, or as of the record date of such dividend, or in the event that no
record date is fixed, upon the making of such dividend.

               (b) Reclassification, Reorganization and Consolidation.  In
                   --------------------------------------------------
case of any reclassification, capital reorganization, or change in the Common
Stock of the Company (other than as a result of a subdivision, combination, or
stock dividend provided for in Section 8(a) above), then as a condition of such
reclassification, reorganization, or change, lawful provision shall be made, and
duly executed documents evidencing the same from the Company or its successor
shall be delivered to the holder of this Warrant, so that the holder of this
Warrant shall have the right at any time after October 12, 1999 and prior to the
expiration of this Warrant to purchase, at a total price equal to that payable
upon the exercise of this Warrant, the kind and amount of shares of stock and
other securities and property receivable in connection with such
reclassification, reorganization, or change by a holder of the same number of
shares of Common Stock as were purchasable by the holder of this Warrant
immediately prior to such reclassification, reorganization, or change. In any
such case appropriate provisions shall be made with respect to the rights and
interest of the holder of this Warrant so that the provisions hereof shall
thereafter be applicable with respect to any shares of stock or other securities
and property deliverable upon exercise hereof, and appropriate adjustments shall
be made to the purchase price per share payable hereunder, provided the
aggregate price shall remain the same.

               (c)  Notice of Adjustment. When any adjustment is required to be
                    --------------------
made in the number or kind  of shares purchasable upon exercise of the Warrant,
or in the Exercise Price, the Company shall promptly notify the holder of such
event and of the number of shares of Common Stock or other securities or
property thereafter purchasable upon exercise of this Warrant.

9.   Fractional Shares or Scrip.  No fractional shares or scrip representing
     --------------------------
fractional shares shall be issued upon the exercise of this Warrant, but in lieu
of such fractional shares the Company shall make a cash payment therefor on the
basis of the Exercise Price then in effect.

10.  No Stockholder Rights.  Prior to exercise of this Warrant, the holder shall
     ---------------------
not be entitled to any rights of a stockholder with respect to the Shares,
including (without limitation) the right to vote such Shares, receive dividends
or other distributions thereon, exercise preemptive rights or be notified of
stockholder meetings, and such holder shall not be entitled to any notice or
other communication concerning the business or affairs of the Company.
<PAGE>

                                      -4-

11.  Successors and Assigns.  The terms and provisions of this Warrant and the
     ----------------------
Purchase Agreement shall inure to the benefit of, and be binding upon, the
Company and the holders hereof and their respective successors and assigns.

12.  Amendments and Waivers.  Any term of this Warrant may be amended and the
     ----------------------
observance of any terms of this Warrant may be waived (either generally or in a
particular instance and either retroactively or prospectively), with the written
consent of the Company and the holder.

13.  Governing Law.  This Warrant shall be governed by the laws of the State of
     -------------
California as applied to agreements among California residents made and to be
performed entirely within the State of California.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]
<PAGE>

                                      -5-

                                    DSL.net, Inc.

                                    By: _______________________________

                                    Title:
                                    Address:   545 Long Wharf Drive
                                               New Haven, CT  06511

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