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USPS Addresses API

developers.usps.com

API
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Spec score 6.6 #27 of 30 in Address Verification Software

Spec sheet

Intended users
The API catalog describes its APIs as tools to integrate with users’ own ideas, and the terms describe access for mailing and shipping activity and related software or services.Read 9 Oct 2026 · developers.usps.com
Support
USPS directs users with API issues or quota errors to submit a service request for assistance.Read 9 Oct 2026 · developers.usps.com
Headquarters
Washington, DCRead 28 Sep 2026 · developers.usps.com
Access requirement
From July 12, 2026, USPS says use requires a signed license agreement and tier-based fees.Read 9 Oct 2026 · developers.usps.com
Address validation
The Addresses API validates and corrects address information to reduce errors and improve package delivery and pricing.Read 9 Oct 2026 · developers.usps.com
API interface
The USPS API catalog lists REST as its API style.Read 9 Oct 2026 · developers.usps.com
Authentication
USPS APIs use OAuth, and users receive a Consumer Key and Secret when adding an app in the API Developer Portal.Read 9 Oct 2026 · developers.usps.com
Enhanced API changes
USPS says the enhanced Addresses API adds near real-time address updates, improved matching logic, and additional address indicators.Read 9 Oct 2026 · developers.usps.com
Location lookups
The API can look up valid cities and states from a ZIP Code and valid ZIP Codes from a city and state.Read 9 Oct 2026 · developers.usps.com
Maker history
USPS says its history began in 1775, when the Second Continental Congress appointed Benjamin Franklin postmaster general.Read 9 Oct 2026 · about.usps.com
Migration access
USPS states that users who did not complete onboarding lost access to the Addresses API and must start an Addresses API license signup through the Business Portal to regain access.Read 9 Oct 2026 · developers.usps.com
Permitted use
The general API terms limit use to USPS shipping or mailing transactions unless a specific license allows otherwise.Read 9 Oct 2026 · developers.usps.com
Prohibited activity
The terms prohibit using the service or its data to create address lists or databases for third-party use, and prohibit reselling the service.Read 9 Oct 2026 · developers.usps.com
Standardization
Address Standardization validates and standardizes domestic addresses, city and state names, and ZIP Codes to USPS addressing standards, including ZIP+4.Read 9 Oct 2026 · developers.usps.com
Usage limits
USPS says request limits depend on the API or data type and may be changed, and it may restrict use when it suspects data mining or address-list creation.Read 9 Oct 2026 · developers.usps.com

Plans and prices

Tier-based fees Priced on request Tier-based fees apply; exact amounts are not stated on the page. License agreement required · fees apply from July 12, 2026 Read 9 Oct 2026 · developers.usps.com

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