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Ducks Unlimited vs Zipcodestack

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

APIDucks UnlimitedNEW—ZipcodestackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Ducks Unlimited vs Zipcodestack: common questions

Which is more reliable, Ducks Unlimited or Zipcodestack?

On our scheduled checks, Zipcodestack leads on measured uptime — Ducks Unlimited at —% versus Zipcodestack 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 Ducks Unlimited and Zipcodestack need an API key?

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

Can I call Ducks Unlimited and Zipcodestack from the browser?

Yes — both Ducks Unlimited and Zipcodestack 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 Ducks Unlimited and Zipcodestack free for commercial use?

Ducks Unlimited has unclear commercial terms, and Zipcodestack 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.