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ClickSend REST API v3 vs ISO 3166 Updates API

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

APIClickSend REST API v3NEW—ISO 3166 Updates APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limit6000 req/window · 5999 remaining · resets 1500 req/window
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs ISO 3166 Updates API: common questions

Which is more reliable, ClickSend REST API v3 or ISO 3166 Updates API?

On our scheduled checks, ISO 3166 Updates API leads on measured uptime — ClickSend REST API v3 at —% versus ISO 3166 Updates API 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 ISO 3166 Updates API need an API key?

ISO 3166 Updates API needs no key, while ClickSend REST API v3 requires a free API key. If you want to start calling without signup, reach for ISO 3166 Updates API first.

Can I call ClickSend REST API v3 and ISO 3166 Updates API from the browser?

Yes — both ClickSend REST API v3 and ISO 3166 Updates API 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 ISO 3166 Updates API free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and ISO 3166 Updates 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.