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Fixer API vs OkSurf

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

APIFixer APINEW—OkSurfNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fixer API vs OkSurf: common questions

Which is more reliable, Fixer API or OkSurf?

On our scheduled checks, OkSurf leads on measured uptime — Fixer API at —% versus OkSurf 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 API and OkSurf need an API key?

OkSurf needs no key, while Fixer API requires a free API key. If you want to start calling without signup, reach for OkSurf first.

Can I call Fixer API and OkSurf from the browser?

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

Are Fixer API and OkSurf free for commercial use?

Fixer API has unclear commercial terms, and OkSurf 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.