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Callook.info vs IBM X-Force Exchange API

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

APICallook.infoHEALTHY94IBM X-Force Exchange APIHEALTHY96
Uptime · 30d
Uptime · 90d100%98.0%
Uptime · 30d100%98.3%
P50 · ms437238
P95 · ms1156868
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs IBM X-Force Exchange API: common questions

Which is more reliable, Callook.info or IBM X-Force Exchange API?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus IBM X-Force Exchange API at 98.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Callook.info or IBM X-Force Exchange API?

IBM X-Force Exchange API has the lower median latency in our checks — Callook.info responds in 437 ms versus IBM X-Force Exchange API at 238 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 Callook.info and IBM X-Force Exchange API need an API key?

Callook.info needs no key, while IBM X-Force Exchange API requires a free API key. If you want to start calling without signup, reach for Callook.info first.

Can I call Callook.info and IBM X-Force Exchange API from the browser?

Only Callook.info is browser-friendly — it returns CORS headers over HTTPS. IBM X-Force Exchange API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Callook.info and IBM X-Force Exchange API free for commercial use?

Callook.info has unclear commercial terms, and IBM X-Force Exchange 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.