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FEC vs ONS

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

APIFECREACHABLE—ONSNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
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

FEC vs ONS: common questions

Which is more reliable, FEC or ONS?

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

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

Can I call FEC and ONS from the browser?

Yes — both FEC and ONS send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are FEC and ONS free for commercial use?

FEC has unclear commercial terms, and ONS 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.