USPS Addresses API
The facts below are what the maker publishes about USPS Addresses API, checked and dated. Our editors have not written about it yet.
Plans and prices
From USPS Addresses API's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Tier-based fees | Priced on request | License agreement required · fees apply from July 12, 2026 · Tier-based fees apply; exact amounts are not stated on the page. |
The facts
Each one read from USPS Addresses API's own pages, with the date it was checked.
What it does
- Access requirement
- From July 12, 2026, USPS says use requires a signed license agreement and tier-based fees.checked 9 Oct 2026
- Address validation
- The Addresses API validates and corrects address information to reduce errors and improve package delivery and pricing.checked 9 Oct 2026
- API interface
- The USPS API catalog lists REST as its API style.checked 9 Oct 2026
- Authentication
- USPS APIs use OAuth, and users receive a Consumer Key and Secret when adding an app in the API Developer Portal.checked 9 Oct 2026
- Enhanced API changes
- USPS says the enhanced Addresses API adds near real-time address updates, improved matching logic, and additional address indicators.checked 9 Oct 2026
- 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.checked 9 Oct 2026
- Location lookups
- The API can look up valid cities and states from a ZIP Code and valid ZIP Codes from a city and state.checked 9 Oct 2026
- 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.checked 9 Oct 2026
- Permitted use
- The general API terms limit use to USPS shipping or mailing transactions unless a specific license allows otherwise.checked 9 Oct 2026
- 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.checked 9 Oct 2026
- Standardization
- Address Standardization validates and standardizes domestic addresses, city and state names, and ZIP Codes to USPS addressing standards, including ZIP+4.checked 9 Oct 2026
- Support
- USPS directs users with API issues or quota errors to submit a service request for assistance.checked 9 Oct 2026
- 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.checked 9 Oct 2026
The company
- Headquarters
- Washington, DCchecked 28 Sep 2026
- Maker history
- USPS says its history began in 1775, when the Second Continental Congress appointed Benjamin Franklin postmaster general.checked 9 Oct 2026
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