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ClickSend REST API v3 vs PostcodeData.nl

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

APIClickSend REST API v3HEALTHY96PostcodeData.nlHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms324692
P95 · ms10351989
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limit6000 req/window · 5999 remaining · resets 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClickSend REST API v3 vs PostcodeData.nl: common questions

Which is more reliable, ClickSend REST API v3 or PostcodeData.nl?

Both are neck-and-neck — ClickSend REST API v3 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, ClickSend REST API v3 or PostcodeData.nl?

ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 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 ClickSend REST API v3 and PostcodeData.nl need an API key?

PostcodeData.nl needs no key, while ClickSend REST API v3 requires a free API key. If you want to start calling without signup, reach for PostcodeData.nl first.

Can I call ClickSend REST API v3 and PostcodeData.nl from the browser?

Only ClickSend REST API v3 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 ClickSend REST API v3 and PostcodeData.nl free for commercial use?

ClickSend REST API v3 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.