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Exchange Rates API vs Polish Bank Branches

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

APIExchange Rates APINEW—Polish Bank BranchesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
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?

On our scheduled checks, Polish Bank Branches leads on measured uptime — Exchange Rates API at —% versus Polish Bank Branches 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 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?

Only Polish Bank Branches is browser-friendly — it returns CORS headers over HTTPS. Exchange Rates API needs a server-side call or proxy, so factor that into which one fits a front-end project.

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.