X-Cart is integrated with USPS carrier services via the USPS add-on and can communicate with USPS Web Tools Ecommerce APIs to retrieve the list of available USPS delivery methods and calculate the rates charged for shipping ordered items to international customers and customers within the United States.

NOTE: The add-on calculates rates for orders shipped from the United States only. You only need to enter your USPS credentials to start using it. Make sure you have configured the ship-from address properly.

To start using the USPS add-on, you need to ensure it is installed and enabled.

General add-on installation instructions are available in Installing Add-ons from X-Cart App Store.

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