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Fixer vs Marketstack

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

APIFixerNEW—MarketstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fixer vs Marketstack: common questions

Which is more reliable, Fixer or Marketstack?

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

Both ask you to authenticate — Fixer uses an API key and Marketstack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call Fixer and Marketstack from the browser?

Only Fixer 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 Fixer and Marketstack free for commercial use?

Fixer 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.