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National Bank of Poland vs Tax Data

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

APINational Bank of PolandNEW—Tax DataNEW—
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

National Bank of Poland vs Tax Data: common questions

Which is more reliable, National Bank of Poland or Tax Data?

On our scheduled checks, Tax Data leads on measured uptime — National Bank of Poland at —% versus Tax Data 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 National Bank of Poland and Tax Data need an API key?

National Bank of Poland needs no key, while Tax Data requires a free API key. If you want to start calling without signup, reach for National Bank of Poland first.

Can I call National Bank of Poland and Tax Data from the browser?

Yes — both National Bank of Poland and Tax Data 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 National Bank of Poland and Tax Data free for commercial use?

National Bank of Poland has unclear commercial terms, and Tax Data 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.