

Validate VAT numbers and calculate VAT rates.
VAT Validation API is a free Finance API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Abstract's free VAT Validation and Rates API makes it easy to collect the right VAT and stay compliant. Fast, reliable, and accurate API trusted by 1,000+ businesses.
Details from abstractapi.com.

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Yes. The VAT Validation API is listed in the Finance 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 VAT Validation API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The VAT Validation API supports CORS, so front-end JavaScript can call it directly.
Yes. The VAT Validation API is served over HTTPS, so it's safe to use in production.