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Quickstart
3 posts in this collection.
3 reviewed guides
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QuickstartMarch 10, 2026
USPS v3 Address Validation: One Request, Start to Finish
The USPS v3 address call in curl, Python and Node: OAuth, the required parameters, every DPV code, and the license USPS has required since August 1, 2026.
9 min readTutorialMarch 10, 2026
USPS Node.js SDK Quickstart: TypeScript Client for the v3 API
Install usps-v3, authenticate once, and call address validation, tracking, rates, and labels from Node. Zero dependencies, typed errors, Express route.
12 min readTutorialMarch 10, 2026
USPS Python SDK Quickstart: Validate, Track, and Rate with usps-v3
Install usps-v3, authenticate once, and call address validation, tracking, and rates from Python. Working code, real return shapes, typed errors.
11 min read