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ClickSend REST API v3 vs IsItWater

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

APIClickSend REST API v3NEW—IsItWaterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
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 IsItWater: common questions

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

On our scheduled checks, IsItWater leads on measured uptime — ClickSend REST API v3 at —% versus IsItWater 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 ClickSend REST API v3 and IsItWater need an API key?

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

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

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

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