Address Verify USPS CASS Certified Address Verification
USPS CASS Certification — Powered by Smarty's CASS-certified validation engine Bulk Verification — Verify up to 100 addresses per request (plan-dependent) For heuristic-based validation (no USPS lookup), see our AddressVerify api. It's cheaper and faster.
3 subscribers
5 endpoints
The in-depth APIMemo review for this API hasn't been published yet —
the data below comes straight from the public marketplace listing.
Address Verify USPS CASS Certified Address Verification endpoints
| Method | Endpoint | Description |
|---|---|---|
| v1 | ||
| POST |
verifyAddressPost /v1/verify |
Verify a single US street address via JSON body. |
| GET |
getDocs /v1/docs |
Returns API documentation with endpoint details and pricing. |
| GET |
verifyAddressGet /v1/verify |
Verify a single US street address against the USPS CASS database. Provide at minimum street + (city/state OR zip). |
| POST |
bulkVerify /v1/bulk |
Verify multiple US addresses in a single request. Requires Starter plan or higher. Bulk limits: Starter=25, Pro=100, Business=500, Enterprise=1,000. |
| health | ||
| GET |
healthCheck /health |
Returns service health status. |
Address Verify USPS CASS Certified Address Verification pricing
| Plan | Price | Rate limit | Quotas |
|---|---|---|---|
| BASIC | Free | — |
|
| PRO | $9.99 / month | 30 / minute |
|
| ULTRA Recommended | $49.99 / month | 150 / minute |
|
| MEGA | $199 / month | 500 / minute |
|
