
Validates email, phone, IBAN, EU VAT against VIES, and Canadian, Spanish and US national IDs.
VerifNow API is a free Data Validation API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.
Validate emails, phone numbers, and more in real-time with the VerifNow API
Details from docs.verifnow.io.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Validates Turkish national ID, tax number, IBAN, phone, plate and parses addresses
Validate and standardize US addresses, with ZIP+4 and deliverability status
Parse freeform US addresses into structured fields (house number, street, unit, city, state, ZIP)
The VerifNow API is provided by VerifNow Docs (docs.verifnow.io). Validate emails, phone numbers, and more in real-time with the VerifNow API
Yes. The VerifNow API is listed in the Data Validation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The VerifNow API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The VerifNow API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The VerifNow API is served over HTTPS, so it's safe to use in production.