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ClickSend REST API v3 vs Proweblook IP Checker

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

APIClickSend REST API v3HEALTHY96Proweblook IP CheckerREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms32456
P95 · ms1035232
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limit6000 req/window · 5999 remaining · resets 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs Proweblook IP Checker: common questions

Which is more reliable, ClickSend REST API v3 or Proweblook IP Checker?

Both are neck-and-neck — ClickSend REST API v3 and Proweblook IP Checker 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 Proweblook IP Checker?

Proweblook IP Checker has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus Proweblook IP Checker at 56 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 Proweblook IP Checker need an API key?

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

Yes — both ClickSend REST API v3 and Proweblook IP Checker send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are ClickSend REST API v3 and Proweblook IP Checker free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and Proweblook IP Checker 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.