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Exchange Rates API vs Polish Bank Branches

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

APIExchange Rates APIHEALTHY88Polish Bank BranchesHEALTHY80
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms8102310
P95 · ms41624135
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 Polish Bank Branches: common questions

Which is more reliable, Exchange Rates API or Polish Bank Branches?

Both are neck-and-neck — Exchange Rates API and Polish Bank Branches 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 Polish Bank Branches?

Exchange Rates API has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus Polish Bank Branches at 2310 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 Polish Bank Branches need an API key?

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

Can I call Exchange Rates API and Polish Bank Branches from the browser?

Yes — both Exchange Rates API and Polish Bank Branches 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 Polish Bank Branches free for commercial use?

Exchange Rates API has unclear commercial terms, and Polish Bank Branches 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.