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ClickSend REST API v3 vs Open Topo Data

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

APIClickSend REST API v3HEALTHY96Open Topo DataHEALTHY95
Uptime · 30d
Uptime · 90d100%93.1%
Uptime · 30d100%88.3%
P50 · ms324285
P95 · ms1035573
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 Open Topo Data: common questions

Which is more reliable, ClickSend REST API v3 or Open Topo Data?

On our scheduled checks, ClickSend REST API v3 leads on measured uptime — ClickSend REST API v3 at 100% versus Open Topo Data at 93.1% 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 Open Topo Data?

Open Topo Data has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus Open Topo Data at 285 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 Open Topo Data need an API key?

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

Can I call ClickSend REST API v3 and Open Topo Data from the browser?

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

Are ClickSend REST API v3 and Open Topo Data free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and Open Topo Data 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.