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.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score75
Authentication15/25API key required
Pricing17/20Freemium tier available
Docs14/20Documentation URL provided
Formats9/15Single response format
Freshness20/20Verified within 6 months
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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
- Sign up with the provider to get an API key.
- 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.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.