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Lookup.im API vs Urlbox API

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

APILookup.im APINEW—Urlbox APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
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

Lookup.im API vs Urlbox API: common questions

Which is more reliable, Lookup.im API or Urlbox API?

On our scheduled checks, Urlbox API leads on measured uptime — Lookup.im API at —% versus Urlbox API 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 Lookup.im API and Urlbox API need an API key?

Both ask you to authenticate — Lookup.im API 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 Lookup.im API and Urlbox API from the browser?

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

Are Lookup.im API and Urlbox API free for commercial use?

Lookup.im API 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.