Address Validation API Frequently Asked Questions
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Is there a rate limit on the API?
Address Validation API has a default rate limit of 6000 Queries Per Minute (QPM). See
Usage limits and billing for more information.
Is the Address Validation API CASS Certified™?
The United States Postal Service® (USPS®)1 maintains the
Coding Accuracy Support System (CASS™)
to support and certify address validation providers. The
Address Validation API is a CASS Certified™ service that you can
optionally use as part of the address validation process.
For more information, see Validate an address.
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Last updated 2025-09-03 UTC.
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