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Currencylayer vs Frankfurter

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

APICurrencylayerHEALTHY93FrankfurterHEALTHY86
Uptime · 30d
Uptime · 90d100%88.2%
Uptime · 30d100%86.7%
P50 · ms511370
P95 · ms9674986
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree tier — key may be requiredUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Currencylayer vs Frankfurter: common questions

Which is more reliable, Currencylayer or Frankfurter?

On our scheduled checks, Currencylayer leads on measured uptime — Currencylayer at 100% 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, Currencylayer or Frankfurter?

Frankfurter has the lower median latency in our checks — Currencylayer responds in 511 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 Currencylayer and Frankfurter need an API key?

Frankfurter needs no key, while Currencylayer requires a free API key. If you want to start calling without signup, reach for Frankfurter first.

Can I call Currencylayer and Frankfurter from the browser?

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

Are Currencylayer and Frankfurter free for commercial use?

Currencylayer 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.