USPS Express Mail Service Commitments

The USPS Express Mail Service Commitments API allows developers to get delivery commitments for Express Mail packages. Users must provide the origin and destination ZIP codes and, optionally, the current or future date on which the package will be shipped. The API returns all Express Mail Service Commitments for the given locations, including package drop-off information.This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.