USPS Address Verification API Free: What You Get and How to Use It

 Looking for a USPS Address Verification API free option? The good news is that USPS does offer address verification capabilities at no cost—if you meet certain conditions.



Here’s what to know:

  • USPS Web Tools provide a free API that can be used to standardize and verify domestic addresses.

  • You’ll need to register for a USPS Web Tools account to get access.

  • Their API can correct street spellings, add ZIP+4 codes, and return CASS-certified address formats.

However, the free tier has limitations:

  • It only works for U.S. addresses

  • It doesn’t provide geolocation or predictive address input

  • No support for bulk processing or international validation

While free, it’s best suited for small businesses, startups, or developers testing prototypes. For higher-volume usage or broader functionality, commercial providers like Smarty or Lob often offer USPS data with enhanced features like autocomplete or analytics.

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