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CEORater API vs ES·pera API

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

APICEORater APIDEAD0ES·pera APIDYING37
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierFree — limits not published
Rate limitUnpublished
In directory since2026-07-052026-09-21
operationalpartialdownno data

CEORater API vs ES·pera API: common questions

Which is more reliable, CEORater API or ES·pera API?

Both are neck-and-neck — CEORater API and ES·pera API each measure 0.0% 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.

Do CEORater API and ES·pera API need an API key?

Neither needs a paid key — CEORater API is callable with no signup, and ES·pera API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call CEORater API and ES·pera API from the browser?

Neither sends browser-friendly CORS headers reliably, so call CEORater API and ES·pera API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are CEORater API and ES·pera API free for commercial use?

CEORater API has unclear commercial terms, and ES·pera 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.