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Exchange Rates API vs National Bank of Poland

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

APIExchange Rates APIHEALTHY88National Bank of PolandHEALTHY88
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms810899
P95 · ms41622087
Authnonenone
CORSyesyes
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

Exchange Rates API vs National Bank of Poland: common questions

Which is more reliable, Exchange Rates API or National Bank of Poland?

Both are neck-and-neck — Exchange Rates API and National Bank of Poland 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, Exchange Rates API or National Bank of Poland?

Exchange Rates API has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus National Bank of Poland at 899 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 Exchange Rates API and National Bank of Poland need an API key?

Neither needs a paid key — Exchange Rates API is callable with no signup, and National Bank of Poland is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Exchange Rates API and National Bank of Poland from the browser?

Yes — both Exchange Rates API and National Bank of Poland 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 Exchange Rates API and National Bank of Poland free for commercial use?

Exchange Rates API has unclear commercial terms, and National Bank of Poland 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.