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AZ511 vs PostalPinCode

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

APIAZ511NEW—PostalPinCodeNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — no key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AZ511 vs PostalPinCode: common questions

Which is more reliable, AZ511 or PostalPinCode?

On our scheduled checks, PostalPinCode leads on measured uptime — AZ511 at —% versus PostalPinCode 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 AZ511 and PostalPinCode need an API key?

PostalPinCode needs no key, while AZ511 requires a free API key. If you want to start calling without signup, reach for PostalPinCode first.

Can I call AZ511 and PostalPinCode from the browser?

Only PostalPinCode is browser-friendly — it returns CORS headers over HTTPS. AZ511 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AZ511 and PostalPinCode free for commercial use?

AZ511 has unclear commercial terms, and PostalPinCode 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.