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Frankfurter vs Municipal Finance API

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

APIFrankfurterHEALTHY86Municipal Finance APIHEALTHY78
Uptime · 30d
Uptime · 90d88.2%96.1%
Uptime · 30d86.7%98.3%
P50 · ms3702094
P95 · ms49862952
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic data (ECB reference rates)Unverified
Free tierUnlimited — abuse-rate-limited onlyFree — limits not published
Rate limitUnpublished, generousUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Frankfurter vs Municipal Finance API: common questions

Which is more reliable, Frankfurter or Municipal Finance API?

On our scheduled checks, Municipal Finance API leads on measured uptime — Frankfurter at 88.2% versus Municipal Finance API at 96.1% 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, Frankfurter or Municipal Finance API?

Frankfurter has the lower median latency in our checks — Frankfurter responds in 370 ms versus Municipal Finance API at 2094 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 Frankfurter and Municipal Finance API need an API key?

Neither needs a paid key — Frankfurter is callable with no signup, and Municipal Finance API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Frankfurter and Municipal Finance API from the browser?

Yes — both Frankfurter and Municipal Finance API 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 Frankfurter and Municipal Finance API free for commercial use?

Frankfurter allows commercial use on its free tier, and Municipal Finance API 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.