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ClickSend REST API v3 vs Ducks Unlimited

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

APIClickSend REST API v3HEALTHY96Ducks UnlimitedHEALTHY88
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms324832
P95 · ms10352202
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 Ducks Unlimited: common questions

Which is more reliable, ClickSend REST API v3 or Ducks Unlimited?

On our scheduled checks, ClickSend REST API v3 leads on measured uptime — ClickSend REST API v3 at 100% versus Ducks Unlimited at 99.02% 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 Ducks Unlimited?

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus Ducks Unlimited at 832 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 Ducks Unlimited need an API key?

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

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

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

ClickSend REST API v3 has unclear commercial terms, and Ducks Unlimited 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.