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ExchangeRate-API (open) vs Marketstack

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

APIExchangeRate-API (open)HEALTHY98MarketstackHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms221470
P95 · ms10914068
AuthnoneapiKey
CORSyesno
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

ExchangeRate-API (open) vs Marketstack: common questions

Which is more reliable, ExchangeRate-API (open) or Marketstack?

Both are neck-and-neck — ExchangeRate-API (open) and Marketstack each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, ExchangeRate-API (open) or Marketstack?

ExchangeRate-API (open) has the lower median latency in our checks — ExchangeRate-API (open) responds in 221 ms versus Marketstack at 470 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 ExchangeRate-API (open) and Marketstack need an API key?

ExchangeRate-API (open) needs no key, while Marketstack requires a free API key. If you want to start calling without signup, reach for ExchangeRate-API (open) first.

Can I call ExchangeRate-API (open) and Marketstack from the browser?

Only ExchangeRate-API (open) 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 ExchangeRate-API (open) and Marketstack free for commercial use?

ExchangeRate-API (open) 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.