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ClickSend REST API v3 vs ISO 3166-2 API

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

APIClickSend REST API v3HEALTHY96ISO 3166-2 APIHEALTHY84
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms3241056
P95 · ms10352865
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 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs ISO 3166-2 API: common questions

Which is more reliable, ClickSend REST API v3 or ISO 3166-2 API?

Both are neck-and-neck — ClickSend REST API v3 and ISO 3166-2 API 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 ISO 3166-2 API?

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus ISO 3166-2 API at 1056 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 ISO 3166-2 API need an API key?

ISO 3166-2 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 3166-2 API first.

Can I call ClickSend REST API v3 and ISO 3166-2 API from the browser?

Yes — both ClickSend REST API v3 and ISO 3166-2 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 3166-2 API free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and ISO 3166-2 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.