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.

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  2. Developers


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

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  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.

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  5. Frequently Asked Questions

    Web Tools FAQs

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

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