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Exchange Rates API vs Twelve Data

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

APIExchange Rates APINEW—Twelve DataREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs Twelve Data: common questions

Which is more reliable, Exchange Rates API or Twelve Data?

On our scheduled checks, Twelve Data leads on measured uptime — Exchange Rates API at —% versus Twelve Data 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 Twelve Data need an API key?

Exchange Rates API needs no key, while Twelve Data requires a free API key. If you want to start calling without signup, reach for Exchange Rates API first.

Can I call Exchange Rates API and Twelve Data from the browser?

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

Are Exchange Rates API and Twelve Data free for commercial use?

Exchange Rates API has unclear commercial terms, and Twelve Data 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.