A small thing, scaled.

Type a real US ZIP — city and state fill themselves in. Type a fake one — the form quietly flags it before submit.

This is a public evaluation demo. It runs against a shared, balance-capped key and is rate-limited to 10 requests per hour per IP. Please don't abuse it — if you want unrestricted use, sign up free for 1,000 queries (no credit card required).

Shipping Address

Try typing a real US ZIP code (e.g. 97214). Then try a fake one (e.g. 99999).

Full Name

Street Address

ZIP Code

Type a 5-digit US ZIP — city and state will fill themselves in.

City

State

Saving man-seconds, scaled

Per million customer checkouts, auto-fill returns about 833 hours of human time — three seconds per person, multiplied across the people.

Catching wrong-town shipments

At the industry-average ~1% typo rate, every million lookups also catches ~10,000 fat-fingered ZIPs before they ship to the wrong address.

Sub-5ms responses, often 1–2ms. The lowest price per query of any postal API at $0.000028. 240+ countries and territories.

Try it on your own form — 1,000 free queries, no credit card.