Every EasyPost account comes with a USPS account already enabled and ready to ship. If you wish to add other carriers (or even another USPS account), EasyPost makes it simple.
Steps to add a carrier
1. Click your email on the top left hand side of the screen and select 'Carrier Accounts'.
2. Search and select your carrier.
3. Complete the required fields (certain carriers may require online login authorization) and click 'Create'.