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Exchangerate.dev vs Frankfurter

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

APIExchangerate.devNEW—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 limit12 req/window · 11 remaining · resets 1783515720Unpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Exchangerate.dev vs Frankfurter: common questions

Which is more reliable, Exchangerate.dev or Frankfurter?

On our scheduled checks, Frankfurter leads on measured uptime — Exchangerate.dev at —% versus Frankfurter at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Exchangerate.dev and Frankfurter need an API key?

Neither needs a paid key — Exchangerate.dev 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 Exchangerate.dev and Frankfurter from the browser?

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

Are Exchangerate.dev and Frankfurter free for commercial use?

Exchangerate.dev 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.