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.
GreatAPIs Score
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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.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
Free: 1,500 requests/month (daily rate updates); Pro ($10/mo): 30,000 requests/month; Business ($30/mo): 125,000 requests/month; Volume plan: higher custom quota