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Exchange Rates API vs Marketstack

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

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

Exchange Rates API vs Marketstack: common questions

Which is more reliable, Exchange Rates API or Marketstack?

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

Exchange Rates API needs no key, while Marketstack 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 Marketstack from the browser?

Neither sends browser-friendly CORS headers reliably, so call Exchange Rates API and Marketstack 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 Marketstack free for commercial use?

Exchange Rates API has unclear commercial terms, and Marketstack 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.