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Exchange Rates API vs Frankfurter

Same instrument, two spec sheets — measured, not claimed.

APIExchange Rates APIUNMONITORED—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree — limits not publishedUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Exchange Rates API vs Frankfurter: common questions

Which is more reliable, Exchange Rates API or Frankfurter?

Only Frankfurter is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Exchange Rates API and Frankfurter need an API key?

Neither needs a paid key — Exchange Rates API is callable with no signup, and Frankfurter is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Exchange Rates API and Frankfurter from the browser?

Only Frankfurter is browser-friendly — it returns CORS headers over HTTPS. Exchange Rates API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Exchange Rates API and Frankfurter free for commercial use?

Exchange Rates API has unclear commercial terms, and Frankfurter allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.