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FastDOL vs ONS

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

APIFastDOLNEW—ONSNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

FastDOL vs ONS: common questions

Which is more reliable, FastDOL or ONS?

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

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

Can I call FastDOL and ONS from the browser?

Only ONS is browser-friendly — it returns CORS headers over HTTPS. FastDOL needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are FastDOL and ONS free for commercial use?

FastDOL 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.