Web Tools APIs

USPS Web Tools® are e-commerce application program interfaces (APIs) that can be used for online stores or customer service centers–free of charge.

Get access to USPS Web Tools through our simple registration process.

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  1. Merchants


    Learn how easy integrating USPS Web Tools into your site or app can be.

    Get Started

  2. Developers


    Selling products online? Learn how to make ecommerce shipping easier.

    Get Started Using our Technical Documentation files

  3. List of APIs

    List of APIs

    Browse a full list of Web Tools APIs.

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  4. Technical Documents

    Technical Documents

    View a complete list of technical documents with step-by-step instructions for integration.

    Get Started Using our Technical Documentation files

  5. Frequently Asked Questions

    Web Tools FAQs

    View the answers to the most frequently asked questions about USPS Web Tools APIs.

    Download Now RTF file for Web Tools Frequently Asked Questions January 2015 RTF 474KB