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arcsecond.io vs Keen IO

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

APIarcsecond.ioNEW—Keen IONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

arcsecond.io vs Keen IO: common questions

Which is more reliable, arcsecond.io or Keen IO?

On our scheduled checks, Keen IO leads on measured uptime — arcsecond.io at —% versus Keen IO 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 arcsecond.io and Keen IO need an API key?

arcsecond.io needs no key, while Keen IO requires a free API key. If you want to start calling without signup, reach for arcsecond.io first.

Can I call arcsecond.io and Keen IO from the browser?

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

Are arcsecond.io and Keen IO free for commercial use?

arcsecond.io has unclear commercial terms, and Keen IO 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.