Currency Exchange — entry 004 of 18
Fixer
Fixer delivers current and historical foreign-exchange rates back to January 1999, sourced in part from the European Central Bank, with conversion available as a dedicated endpoint and time-series/fluctuation data unlocked on its Professional and Professional Plus tiers. It covers 170 currencies and, like Currencylayer and Exchangerate.host, now operates under the APILayer umbrella sharing its billing and docs platform. The whole site and API force HTTPS today, including the free 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/fixer/"><img src="https://greatapis.com/badge/fixer.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.