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FastDOL vs ONS

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

APIFastDOLHEALTHY85ONSHEALTHY90
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms680732
P95 · ms17251819
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?

Both are neck-and-neck — FastDOL and ONS 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, FastDOL or ONS?

FastDOL has the lower median latency in our checks — FastDOL responds in 680 ms versus ONS at 732 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 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.