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Library . USPS
Even the U.S. Postal Service has an API! The USPS webservice lets you validate address information, do zipcode lookups, get shipping cost estimates, track packages and more.
The Address Information API is used to make sure mailing addresses are correct. The API offers functionality that lets you perform city/state lookups, address validation, and zip code lookups. This can be useful for generating accurate city/state information, correcting errors in street addresses, and finding appropriate zip codes and zip+4 codes for given street addresses.
The Delievery Information API is used to check estimated delivery times prior to mailing or check delivery status after mailing. The API lets you access the following tools: Track & Confirm, Priority Mail Service Standards, Package Service Standards, and Express Mail Service Commitments.
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