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ClickSend REST API v3 vs Visitor Statistics API

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

APIClickSend REST API v3HEALTHY96Visitor Statistics APIHEALTHY86
Uptime · 30d
Uptime · 90d100%98.0%
Uptime · 30d100%98.3%
P50 · ms324847
P95 · ms10352159
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limit6000 req/window · 5999 remaining · resets 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs Visitor Statistics API: common questions

Which is more reliable, ClickSend REST API v3 or Visitor Statistics API?

On our scheduled checks, ClickSend REST API v3 leads on measured uptime — ClickSend REST API v3 at 100% versus Visitor Statistics 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, ClickSend REST API v3 or Visitor Statistics API?

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus Visitor Statistics API at 847 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 Visitor Statistics API need an API key?

Visitor Statistics API needs no key, while ClickSend REST API v3 requires a free API key. If you want to start calling without signup, reach for Visitor Statistics API first.

Can I call ClickSend REST API v3 and Visitor Statistics API from the browser?

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

Are ClickSend REST API v3 and Visitor Statistics API free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and Visitor Statistics 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.