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Loket.nl API vs PostalCodes

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

APILoket.nl APIHEALTHY95PostalCodesHEALTHY84
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms3611030
P95 · ms10392594
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Loket.nl API vs PostalCodes: common questions

Which is more reliable, Loket.nl API or PostalCodes?

On our scheduled checks, Loket.nl API leads on measured uptime — Loket.nl API at 100% versus PostalCodes 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, Loket.nl API or PostalCodes?

Loket.nl API has the lower median latency in our checks — Loket.nl API responds in 361 ms versus PostalCodes at 1030 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 Loket.nl API and PostalCodes need an API key?

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

Can I call Loket.nl API and PostalCodes from the browser?

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

Are Loket.nl API and PostalCodes free for commercial use?

Loket.nl API has unclear commercial terms, and PostalCodes 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.