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USPS Track Request API MASTER RECORD

The USPS Track Request API allows developers to request information on the delivery status of Priority Mail, Express Mail, and Package Services (Standard Post, Bound Printed Matter, Library Mail, and Media Mail) packages using their TrackIDs. This API limits data requests to thirty-five packages per call.

This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.