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CustomGPT.ai vs Urlbox API

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

APICustomGPT.aiDEAD0Urlbox APIDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CustomGPT.ai vs Urlbox API: common questions

Which is more reliable, CustomGPT.ai or Urlbox API?

Both are neck-and-neck — CustomGPT.ai and Urlbox 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 CustomGPT.ai and Urlbox API need an API key?

Both ask you to authenticate — CustomGPT.ai uses an API key and Urlbox API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call CustomGPT.ai and Urlbox API from the browser?

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

Are CustomGPT.ai and Urlbox API free for commercial use?

CustomGPT.ai has unclear commercial terms, and Urlbox 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.