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USPS Track & Confirm API

The U.S. Postal Service provides a suite of USPS Web Tools that customers may integrate into their own websites to validate or find mailing addresses, track and confirm mail delivery, calculate shipping rates, and create domestic or international shipping labels. The Track & Confirm APIs provide estimated delivery information and the ability to track packages through the shipping process. It applies to packages shipped through the following services: Priority Mail, Express Mail, as well as Package Services (including Standard Post, Bound Printed Matter, Library Mail, Media Mail) that include Delivery Confirmation.