shipapis
StarSubmit an APISubmit API

ClickSend REST API v3 vs ISO 3166 Updates API

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

APIClickSend REST API v3HEALTHY96ISO 3166 Updates APIHEALTHY78
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms3241402
P95 · ms10352526
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?

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

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus ISO 3166 Updates API at 1402 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 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.