Data Validation · head-to-head
US Street Address vs VATlayer
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.
vatlayer checks whether an EU VAT registration number is currently valid and, where the member state's VIES service exposes it, returns the registered company name and address alongside real-time and historical VAT/EU-VAT rate lookups by country. It's one of the apilayer family of JSON micro-APIs, sharing that group's account and billing platform. Requests are plain HTTPS GET calls authenticated with an `access_key` query parameter — no headers or OAuth handshake required.
| US Street Address | VATlayer | |
|---|---|---|
| Authentication | API Key | API Key |
| Pricing | freemium | freemium |
| Formats | JSON, XML | JSON |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
US Street Address supports 2 response formats, while VATlayer offers fewer — pick US Street Address for more integration flexibility.