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Marketstack vs Frankfurter

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

APIMarketstackNEW—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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

Marketstack vs Frankfurter: common questions

Which is more reliable, Marketstack or Frankfurter?

On our scheduled checks, Frankfurter leads on measured uptime — Marketstack 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 Marketstack and Frankfurter need an API key?

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

Can I call Marketstack and Frankfurter from the browser?

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

Are Marketstack and Frankfurter free for commercial use?

Marketstack 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.