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Catchdoms Security API vs Rendex

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

APICatchdoms Security APINEW—RendexNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Catchdoms Security API vs Rendex: common questions

Which is more reliable, Catchdoms Security API or Rendex?

On our scheduled checks, Rendex leads on measured uptime — Catchdoms Security API at —% versus Rendex 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 Catchdoms Security API and Rendex need an API key?

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

Can I call Catchdoms Security API and Rendex from the browser?

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

Are Catchdoms Security API and Rendex free for commercial use?

Catchdoms Security API has unclear commercial terms, and Rendex 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.