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ClickSend REST API v3 vs Ziptastic

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

APIClickSend REST API v3HEALTHY96ZiptasticHEALTHY95
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms324366
P95 · ms10352018
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 Ziptastic: common questions

Which is more reliable, ClickSend REST API v3 or Ziptastic?

Both are neck-and-neck — ClickSend REST API v3 and Ziptastic 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 Ziptastic?

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus Ziptastic at 366 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 Ziptastic need an API key?

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

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

Yes — both ClickSend REST API v3 and Ziptastic 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 Ziptastic free for commercial use?

ClickSend REST API v3 has unclear commercial terms, and Ziptastic 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.