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Exchange Rates API vs Fed Treasury

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

APIExchange Rates APIHEALTHY88Fed TreasuryDEAD0
Uptime · 30d
Uptime · 90d100%0.0%
Uptime · 30d100%0.0%
P50 · ms810—
P95 · ms4162—
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedOpen U.S. Government data (public domain)
Free tierFree — limits not publishedFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs Fed Treasury: common questions

Which is more reliable, Exchange Rates API or Fed Treasury?

On our scheduled checks, Exchange Rates API leads on measured uptime — Exchange Rates API at 100% versus Fed Treasury at 0.0% 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 Fed Treasury need an API key?

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

Can I call Exchange Rates API and Fed Treasury from the browser?

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

Are Exchange Rates API and Fed Treasury free for commercial use?

Exchange Rates API has unclear commercial terms, and Fed Treasury allows commercial use on its free tier. 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.