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ISO 3166 Updates API vs PostcodeData.nl

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

APIISO 3166 Updates APIHEALTHY78PostcodeData.nlHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1402692
P95 · ms25261989
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit500 req/windowUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ISO 3166 Updates API vs PostcodeData.nl: common questions

Which is more reliable, ISO 3166 Updates API or PostcodeData.nl?

Both are neck-and-neck — ISO 3166 Updates API and PostcodeData.nl 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, ISO 3166 Updates API or PostcodeData.nl?

PostcodeData.nl has the lower median latency in our checks — ISO 3166 Updates API responds in 1402 ms versus PostcodeData.nl at 692 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 ISO 3166 Updates API and PostcodeData.nl need an API key?

Neither needs a paid key — ISO 3166 Updates API is callable with no signup, and PostcodeData.nl is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ISO 3166 Updates API and PostcodeData.nl from the browser?

Only ISO 3166 Updates API is browser-friendly — it returns CORS headers over HTTPS. PostcodeData.nl needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ISO 3166 Updates API and PostcodeData.nl free for commercial use?

ISO 3166 Updates API has unclear commercial terms, and PostcodeData.nl 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.