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ExchangeRate-API (open) vs Municipal Finance API

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

APIExchangeRate-API (open)HEALTHY98Municipal Finance APIHEALTHY78
Uptime · 30d
Uptime · 90d100%96.1%
Uptime · 30d100%98.3%
P50 · ms2212094
P95 · ms10912952
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

ExchangeRate-API (open) vs Municipal Finance API: common questions

Which is more reliable, ExchangeRate-API (open) or Municipal Finance API?

On our scheduled checks, ExchangeRate-API (open) leads on measured uptime — ExchangeRate-API (open) at 100% 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, ExchangeRate-API (open) or Municipal Finance API?

ExchangeRate-API (open) has the lower median latency in our checks — ExchangeRate-API (open) responds in 221 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 ExchangeRate-API (open) and Municipal Finance API need an API key?

Neither needs a paid key — ExchangeRate-API (open) 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 ExchangeRate-API (open) and Municipal Finance API from the browser?

Yes — both ExchangeRate-API (open) 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 ExchangeRate-API (open) and Municipal Finance API free for commercial use?

ExchangeRate-API (open) has unclear commercial terms, 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.