Data Validation — entry 007 of 7
US Street Address
Smarty's US Street API is a CASS-certified single/batch address validator: it corrects, standardizes, and appends ZIP+4, county, carrier route, and delivery-point-validation (DPV) data to a US postal address, flagging vacant, undeliverable, or CMRA (commercial mail receiving agency) addresses along the way. Requests can be sent as GET query parameters or as a JSON/XML batch of up to 100 addresses per POST, and responses are returned in the same format. It shares an account and API key with Smarty's other address-data products, including US Autocomplete and US Extract.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsJSON, XMLResponses can be requested as JSON or XML.
GreatAPIs Score
Score67
Authentication15/25API key required
Pricing17/20Freemium tier available
Docs0/20No docs or spec available
Formats15/15Supports 2 response formats
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/us-street-address/"><img src="https://greatapis.com/badge/us-street-address.svg" alt="Scored 67 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.