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Exchangerate.dev vs National Bank of Poland

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

APIExchangerate.devDYING63National Bank of PolandHEALTHY88
Uptime · 30d
Uptime · 90d71.6%100%
Uptime · 30d51.7%100%
P50 · ms336899
P95 · ms8072087
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit12 req/window · 11 remaining · resets 1783515720Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchangerate.dev vs National Bank of Poland: common questions

Which is more reliable, Exchangerate.dev or National Bank of Poland?

On our scheduled checks, National Bank of Poland leads on measured uptime — Exchangerate.dev at 71.6% versus National Bank of Poland at 100% 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, Exchangerate.dev or National Bank of Poland?

Exchangerate.dev has the lower median latency in our checks — Exchangerate.dev responds in 336 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 Exchangerate.dev and National Bank of Poland need an API key?

Neither needs a paid key — Exchangerate.dev 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 Exchangerate.dev and National Bank of Poland from the browser?

Yes — both Exchangerate.dev 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 Exchangerate.dev and National Bank of Poland free for commercial use?

Exchangerate.dev 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.