Currency-api vs VATComply.com

This free, no-key currency API covers 200+ fiat currencies plus common cryptocurrencies and metals, served off jsDelivr's CDN with a Cloudflare Pages fallback and refreshed daily via GitHub Actions — there's no rate limit because there's no backend server to overload. The original fawazahmed0/currency-api repository has been migrated to fawazahmed0/exchange-api as its new home, though the CDN-hosted JSON endpoints (addressable by date or "latest") work exactly the same way for existing integrators.

VATcomply bundles several EU compliance primitives behind one free, keyless API: VIES-backed VAT number validation, current VAT rates for all 27 EU member states, daily ECB foreign-exchange reference rates with history back to January 1999, IP-based geolocation, and IBAN validation. Rather than gating access behind an API key, it simply rate-limits anonymous callers, and it ships both narrative documentation on its homepage and a full interactive OpenAPI reference at a separate endpoint.