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ClickSend REST API v3 vs IPWhois

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

APIClickSend REST API v3HEALTHY96IPWhoisHEALTHY100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms32423
P95 · ms1035598
AuthapiKeyapiKey
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key may be required for production
Rate limit6000 req/window · 5999 remaining · resets 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs IPWhois: common questions

Which is more reliable, ClickSend REST API v3 or IPWhois?

Both are neck-and-neck — ClickSend REST API v3 and IPWhois each measure 100% 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.

Which is faster, ClickSend REST API v3 or IPWhois?

IPWhois has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus IPWhois at 23 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 ClickSend REST API v3 and IPWhois need an API key?

Both ask you to authenticate — ClickSend REST API v3 uses an API key and IPWhois 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 ClickSend REST API v3 and IPWhois from the browser?

Only ClickSend REST API v3 is browser-friendly — it returns CORS headers over HTTPS. IPWhois needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ClickSend REST API v3 and IPWhois free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and IPWhois 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.