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Exchange Rates API vs Exchangerate.dev

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

APIExchange Rates APINEW—Exchangerate.devNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublished12 req/window · 11 remaining · resets 1783515720
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs Exchangerate.dev: common questions

Which is more reliable, Exchange Rates API or Exchangerate.dev?

On our scheduled checks, Exchangerate.dev leads on measured uptime — Exchange Rates API at —% versus Exchangerate.dev 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 Exchange Rates API and Exchangerate.dev need an API key?

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

Can I call Exchange Rates API and Exchangerate.dev from the browser?

Neither sends browser-friendly CORS headers reliably, so call Exchange Rates API and Exchangerate.dev from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Exchange Rates API and Exchangerate.dev free for commercial use?

Exchange Rates API has unclear commercial terms, and Exchangerate.dev has unclear commercial terms. 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.