Smarty US Autocomplete Pro
Free trialLiveLast verified 24 Sept 2026
Autocompletes and validates US street addresses against USPS data as users type.
Example request
curl -s 'https://us-autocomplete-pro.api.smarty.com/lookup?key=$API_KEY&search=123+main&include_only_states=CO&max_results=5'
Free tier, in plain English
42-day self-serve trial with 1,000 total lookups; no ongoing free tier after that.
Alternatives in Geocoding
administrative-divisions-dbFirst-level administrative divisions (states/provinces) per country, sourced from GeoNames, as static JSON.FreeAPI AdresseFrench government address geocoding and reverse geocoding, built from the national address database.FreeAPI Adresse (Base Adresse Nationale)Searches and geocodes official French addresses from the national address database, no key needed.FreeAPI GéoLooks up French communes, départements, and regions by name, postal code, or coordinates.FreeAtlasFetchReverse-geocodes coordinates to country, region and municipality with ISO codes.Freemium