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Ecommerce API Technical Guides

Get step-by-step information on how to integrate USPS Web Tools® into a web site or shipping application in our user's guides.

For technical questions, contact the Internet Customer Care Center at icustomercare@usps.com

Read and download the following technical guides

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Step-by-Step Instructions for All USPS Web Tools

Development Guide PDF

Policies and Procedures for Software Distributors
Distributors Guide PDF

API User’s Guides

Address Information PDF
Carrier Pickup™ PDF
Custom Forms PDF
Delivery Confirmation™ Labels PDF
Domestic Mail Service Standards PDF
Electronic Merchandise Return PDF
Express Mail® Labels PDF
Hold for Pickup Labels PDF
International Shipping Labels PDF
Priority Mail Open and Distribute® Labels PDF
Rate Calculators PDF
Signature Confirmation™ Labels PDF
Track & Confirm PDF

Budget for Your Shipping Needs. Photo of a checkbook and pen. Calculate business prices >