USPS APIs

Official USPS developer APIs for domestic and international prices, labels, tracking and address standardization.

More in Shipping & Package Tracking

Shippo

Multi-carrier shipping API for rates, labels, tracking and returns across USPS, UPS, FedEx, DHL and dozens of other carriers.

EasyPost

REST shipping API that buys labels, compares rates, verifies addresses and tracks packages across 100+ carriers.

ShipEngine

ShipStation's developer shipping API for multi-carrier rate shopping, label creation, address validation and tracking webhooks.

ShipStation API

API for ShipStation accounts to manage orders, shipments, labels and fulfillment workflows programmatically.

Information is summarised in our own words and may be out of date; check the vendor's site for current terms and prices. Not affiliated with USPS APIs. Suggest a correction.

Category	Shipping & Package Tracking
Authentication	OAuth
Pricing	Free
Website	https://developers.usps.com/home
Docs	https://developers.usps.com/apis
Last checked	2026-10-14
As JSON	/api/v1/directory/usps-apis.json