Currency Exchange — entry 001 of 18
Currencylayer
Currencylayer aggregates spot rates from commercial data sources and banking streams to power live, historical, and conversion endpoints for 168 world currencies plus precious metals, with a validation/fallback algorithm claiming six-decimal precision. It's an APILayer product, so it shares that ecosystem's billing, dashboard, and support infrastructure with sibling APIs like Fixer and Exchangerate.host. Update frequency scales with plan tier, from daily on the free plan up to 60-second refreshes on the top tier.
GreatAPIs Score
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<a href="https://greatapis.com/api/currencylayer/"><img src="https://greatapis.com/badge/currencylayer.svg" alt="Scored 75 on greatapis.com"></a>Auth quickstart
- Get a key at the provider
- 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.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
100 API calls/month (daily-refreshed) on Free plan, 10,000/month on Basic, 100,000/month on Enterprise, 500,000/month on Enterprise+, custom/unlimited on Custom plan