Free — no signup needed

Check any US address

Verified against the official USPS database. Get the standardized address, ZIP+4, deliverability status, and guided next steps when USPS needs more information.

USPS standardized address

ZIP+4

Deliverable

Type

Vacant

Raw API response

Now run this same check in your code

One curl, same endpoint, your API key. Under 60 seconds.

curl "https://api.revaddress.com/api/address/validate?streetAddress=...&city=...&state=...&ZIPCode=..." \
  -H "X-API-Key: $REVADDRESS_KEY"

Get Free API Key → View the full endpoint reference

1,000 validations/mo free · no credit card · batch validation + intelligence on Growth

API Reference

Integrate validation into your app or checkout flow.

Batch Validation

Validate 50 addresses per call on Growth plans.

USPS Web Tools Shutdown

Why the old USPS API stopped working.