Currency Exchange — entry 012 of 18
ExchangeRate-API
ExchangeRate-API blends several wholesale FX data sources into one feed spanning over 160 currencies, offering a no-signup "open access" endpoint for basic latest-rate lookups alongside a key-based tier that unlocks pair conversion, enrichment data such as country codes and flags, and historical rates reaching back 30+ years. Paid plans shrink the update interval from daily down to every 5 minutes and add priority support, and the vendor markets over a decade of measured 99.99% uptime as a selling point.
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/exchangerate-api/"><img src="https://greatapis.com/badge/exchangerate-api.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.