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Exchangerate.dev vs Frankfurter

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

APIExchangerate.devDYING63FrankfurterHEALTHY86
Uptime · 30d
Uptime · 90d71.6%88.2%
Uptime · 30d51.7%86.7%
P50 · ms336370
P95 · ms8074986
Authnonenone
CORSyesyes
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 71.6% versus Frankfurter at 88.2% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Exchangerate.dev or Frankfurter?

Exchangerate.dev has the lower median latency in our checks — Exchangerate.dev responds in 336 ms versus Frankfurter at 370 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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?

Yes — both Exchangerate.dev and Frankfurter send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

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.