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arcsecond.io vs Diffbot API

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

APIarcsecond.ioHEALTHY92Diffbot APIHEALTHY80
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms5871144
P95 · ms15784885
AuthnoneapiKey
CORSyesyes
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

arcsecond.io vs Diffbot API: common questions

Which is more reliable, arcsecond.io or Diffbot API?

Both are neck-and-neck — arcsecond.io and Diffbot API 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, arcsecond.io or Diffbot API?

arcsecond.io has the lower median latency in our checks — arcsecond.io responds in 587 ms versus Diffbot API at 1144 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 arcsecond.io and Diffbot API need an API key?

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

Can I call arcsecond.io and Diffbot API from the browser?

Yes — both arcsecond.io and Diffbot API 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 arcsecond.io and Diffbot API free for commercial use?

arcsecond.io has unclear commercial terms, and Diffbot API 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.