USPS CASS-certified US address verification powered by Smarty. DPV, ZIP+4, geocoding, and RDI classification.
Make a real API call — no setup required
curl -X POST "https://addressverifycass.vanmoose.cc/v1/verify" \
-H "Authorization: Bearer vm_live_your_key" \
-H "Content-Type: application/json" \
-d '{}'Run a request to see the response
USPS CASS-Certified against the official postal database
Delivery Point Validation (DPV) — confirms real, deliverable mailbox
Address standardization with ZIP+4 and official USPS formatting
Geocoding with latitude/longitude coordinates
RDI classification — residential vs commercial
Bulk verification up to 1,000 addresses per request (plan-dependent)
Validate shipping addresses at checkout to prevent failed deliveries, reduce return costs, and improve customer satisfaction with real-time USPS verification.
Verify policyholder and applicant addresses against the USPS database for compliance, risk assessment, and accurate correspondence delivery.
CASS-certify your mailing list before printing to qualify for USPS postage discounts and eliminate waste from undeliverable addresses.
Bulk verify your contact database to standardize addresses, fill in ZIP+4, and flag vacant or non-deliverable records.
Start free with 10/month. Scale up as you grow.
Free tier available. No credit card required.