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USPS v3 developer toolkit

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Quick Reference

Free endpoints

GET /api/address/city-state

POST /api/address/validate

POST /api/rates

POST /api/international-prices

GET /api/service-standards

GET /api/shipping-options

GET /api/locations

Protected endpoints

POST /api/labels

GET /api/labels

GET /api/tracking/:number

POST /api/pickup

Header: X-API-Key: your_key_here

188 tests · USPS v3 REST · Free tier live

Docs Rate Calculator AI Box Sizer Address Validator Get API Key

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