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OpenPLZ API vs Zipcodestack

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

APIOpenPLZ APINEW—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

OpenPLZ API vs Zipcodestack: common questions

Which is more reliable, OpenPLZ API or Zipcodestack?

On our scheduled checks, Zipcodestack leads on measured uptime — OpenPLZ API 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 OpenPLZ API and Zipcodestack need an API key?

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

Can I call OpenPLZ API and Zipcodestack from the browser?

Yes — both OpenPLZ API 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 OpenPLZ API and Zipcodestack free for commercial use?

OpenPLZ API 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.