USPS Addresses API
USPS Addresses API: A low-cost USPS API for validating, correcting, and standardizing U.S. addresses. Ranked #17 of 30 in Address Verification Software by our editors (7.8/10); pricing: From $4; best for low-cost US postal API validation.
At a glance
- Editor score7.8 / 10
- PricingFrom $4
- Best forLow-cost US postal API validation
- Free planNo
- Paid from$4/unit/mo
- API accessYes
- Facts checked20 Sep 2026
Where it wins
- USPS-based validation, correction, and standardization
- REST API access with OAuth authentication
- Plans start at $4 per 1,000 records monthly
Where it doesn't
- Domestic U.S. coverage only
- No verified autocomplete or batch validation
- No listed integrations beyond API access
Our verdict on USPS Addresses API
USPS Addresses API is a paid developer service for programmatic validation, correction, and standardization of domestic U.S. addresses. It suits developers and businesses managing shipping, package delivery, or address-quality workflows that need USPS-based processing through an API rather than a standalone interface. Alongside address validation, it provides city and state lookup by ZIP Code and ZIP Code lookup by city and state.
Pricing is organized into four monthly tiers. Tier 1 costs $10 per up to 2,000 record requests and includes Addresses API usage. Tier 2 costs $4.50 per 1,000 records, while Tier 4 costs $4 per 1,000 records; both list Addresses API usage. Tier 3 also includes Addresses API usage. Access requires USPS developer credentials, OAuth, and an Addresses API license, so the product is designed for organizations ready to work with authenticated API requests rather than users seeking a free plan or no-code workflow.
The product’s focus is narrow and clear: domestic U.S. postal data. REST API access, OAuth authentication, address correction, standardization, and ZIP Code lookups cover core validation workflows, but the published positioning does not include international coverage, verified autocomplete, batch validation, or integrations beyond API access. Choose USPS Addresses API when low-cost USPS validation and developer control are the priorities. An alternative is more suitable for teams that need international address coverage, prebuilt integrations, autocomplete, or batch-oriented tools.
USPS Addresses API pricing
All 4 USPS Addresses API plans and prices →
USPS Addresses API fact sheet
| Free plan | No |
|---|---|
| Paid from | $4/unit/mo |
| API access | Yes |
| Batch validation | Not verified |
| Address correction | Yes |
| Address standardization | Yes |
| Address autocomplete | Not verified |
| International coverage | Local |
| Deployment | Cloud |
| Support | |
| Built for | Mid-market, Enterprise (editorial estimate) |
| Pricing | From $4 (source) |
| Website | developers.usps.com |
| Facts checked | 20 Sep 2026 |
Alternatives to USPS Addresses API
- Smarty Address VerificationA broad address data toolkit with strong API, batch, correction, and global coverage.9.4
- PostGrid Address VerificationA capable global validator for teams that need integrations and flexible workflows.9.3
- Loqate Address VerificationA broad address-data quality platform for enterprise validation, enrichment and batch workflows.9.2
See all USPS Addresses API alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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