USPS Addresses API review
A low-cost USPS API for validating, correcting, and standardizing U.S. addresses.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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 pros and cons
- 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
USPS Addresses API fact sheet, pricing and score →
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