The City/State lookup provides ... for a City and State. REST ... The Adjustments API provides an interface for retrieving USPS shipping adjustments based on a Package Identification Code (PIC), commonly referred to as a tracking number....

Trigger to show more about Mapping Web Tools APIs to USPS APIs · Web Tools 2026 Release Notes (PDF) Web Tools Documentation & Updates · Only register for the legacy Web Tools APIs if your third-party software vendor or platform requires it. All other users should register for the new USPS APIs.

To provide the very best API offering, we periodically update our systems which may require current customers to update their software. To determine if these changes/updates apply to you, refer to our most recent Release Notes. This document contains all new changes and steps to resolve if you are affected.

Effective July 12, 2026, the USPS Address API will require users to sign a license agreement and pay tier-based fees to use the service. Along with this change, the API will be enhanced to include near real-time address updates, improved matching logic, and additional address indicators to ...

View Documentation · Pricing APIs provide up to date pricing information for all USPS products. View Documentation · Create and cancel shipping labels. Includes address standardization & correction, pricing, and manifesting. View Documentation · Retrieve tracking status of shipped packages.

There are some differences between the Tracking API v3 and v3r2; other tracking channels, like USPS.com and Informed Delivery that are still using the official system of record v3 API will have some different messaging, information and sometimes events than v3r2. The distinctions are documented at ...

March 17, 2026 - The USPS address verification API features little to no example code. Their documentation is considered weak by nearly all who use them. SDKs for their postal address APIs aren't provided at all, so you'll have to code it one line at a time.

This is a ZIP file of the XML schemas for the 4.1.0 release of the Informed Delivery API. Expand Group (3 Resources) This is documentation for the Informed Delivery API.

This site is an open source effort to improve the experience for developers utilizing the USPS Web Tools APIs. Documentation is generated using Redoc and an OpenAPI 3.0 spec created from the USPS official documentation (PDF format). We have corrected errors and made UX improvements but welcome ...

Implementing these APIs requires experienced programmers who are familiar with Internet and web site development tools and techniques. This document provides guidance and step-by-step instructions for installing the USPS APIs, as well as fulfilling various administrative requirements.

This document contains a Reference Guide to the Address Information Web Tools listed below. See the Developers Guide to learn the administrative process for gaining access to the Web Tools APIs as well as the basic mechanism for calling the APIs and processing the results.

USPS Web Tools API are accessible using your Web Tools User ID. To authenticate a request add the USERID attribute to the outermost XML element and set the value equal to your Web Tools User ID.

March 7, 2024 - Hello Postmasters; I am having a dickens of a time trying to figure out USPS’ Tracking API: https://developer.usps.com/api/87 I am able to get an OAuth just fine but for some reason I can not convey the token to the tracking call. I tried about every combination I can think of (Bearer, OAuth etc) and no matter what I do get tis error: { “apiVersion”: “/tracking/v3”, “error”: { “code”: “401”, “message”: “The access token provided with the request is missing, invalid or has expired.”, “e...

The default product includes OAuth, Addresses, Domestic Pricing, International Pricing, Locations, Service Standards, Service Standards Files, Shipping Options, UserInfo, and Tracking. To get started with APIs not included in the default or to request a quota increase, please contact us by ...

May 11, 2021 - Integrate with the Stamps.com Developer Program to access the number 1 USPS Shipping API. Our REST API lets you access USPS rates, print shipping labels and provides real-time package tracking.

USPS / api-examples Public · Notifications · You must be signed in to change notification settings · Fork 32 · Star 175 · Releases · USPS/api-examples · 25 Feb 21:11 · Norman-NegronMunoz-usps · 4.9.30 · 1bc8ec1 · This commit was created on GitHub.com and signed with GitHub’s verified signature.

April 28, 2026 - /ShippingAPI.dll?API=Verify: get: summary: 'Verify a US address' operationId: verify tags: - Address parameters: - name: API in: query description: This query parameter defines the resource you are accessing required: true schema: type: string default: Verify · The biggest challenge in this project was the size and complexity of response objects. USPS documentation does not provide examples of the variety of responses you might encounter based on different conditions.

April 1, 2026 - Ensure merchants complete authorization via the USPS Business Portal. Learn the 2-step process for merchants to authorize label providers to generate shipping labels on their behalf. Maintain active merchant access tokens. Who You Are: You provide a service, such as reporting and analytics, to a shipper or mailing agent. What Happens: You can get paid access to the Tracking API, Webhook, and Scan Event Extracts for specific Mailer IDs.

"raw": "https://apis.usps.com/oauth2/v3/token", "protocol": "https", "host": [ "apis", "usps", "com" ], "path": [ "oauth2", "v3", "token" ] } }, "response": [] }, { "name": "3.0 OAuth Authorization Code Token", "event": [ { "listen": "test", "script": { "exec": [ "" ], "type": "text/javascript" } } ], "protocolProfileBehavior": { "disabledSystemHeaders": {}, "disableCookies": true ·

March 31, 2026 - While many shippers work with third-party and multicarrier software that serves as the middleman, these options can be costly and inefficient. Offering leading-edge, scalable API management, the USPS Developer Portalarrow_right_alt can be an ideal solution for companies looking to create more efficient processes for their e-commerce, shipping and logistics systems.