USPS OAuth API
Industry-standard OAuth 2.0 Client Credentials authentication protecting access to all USPS APIs. Returns Bearer Tokens used in the Authorization header for all USPS API calls.
Industry-standard OAuth 2.0 Client Credentials authentication protecting access to all USPS APIs. Returns Bearer Tokens used in the Authorization header for all USPS API calls.
Every API here is available over the APIs.io API and to AI agents over MCP.