To set up this method, we will need these credentials:

  • The Username that they assign you in their follow-up email

To use the USPS APIs you must be a registered user.  If you have not registered, go to and follow the instructions to register for the APIs.

Upon completion of the registration process, your user ID will be sent via e-mail to the address specified in the registration.  You will be immediately granted access to the production server for our price calculators, package tracking, address information and service standards and commitments APIs. Please refer to the Restrictions on page 1 for an important notice regarding the use of your user ID.