Currency Exchange — entry 003 of 18
Exchangeratesapi.io
Exchangeratesapi.io exposes real-time and historical exchange-rate lookups across 200+ currencies, layering on conversion, time-series, and fluctuation endpoints as customers move up its plan tiers, with the latter two gated to Professional and Business plans respectively. It explicitly documents CORS support for browser-side consumption, and, like its sister products, has moved its documentation and account management to APILayer's shared docs platform. Refresh cadence tightens from a daily free-tier interval up to 60-second updates on paid plans.
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/exchangeratesapi-io/"><img src="https://greatapis.com/badge/exchangeratesapi-io.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.