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ONS vs PermisAPI

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

APIONSHEALTHY90PermisAPIHEALTHY86
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms7321125
P95 · ms18192663
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ONS vs PermisAPI: common questions

Which is more reliable, ONS or PermisAPI?

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

ONS has the lower median latency in our checks — ONS responds in 732 ms versus PermisAPI at 1125 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 ONS and PermisAPI need an API key?

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

Can I call ONS and PermisAPI from the browser?

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

Are ONS and PermisAPI free for commercial use?

ONS has unclear commercial terms, and PermisAPI 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.