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Exchange Rates API vs Fed Treasury

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

APIExchange Rates APINEW—Fed TreasuryNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
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, Fed Treasury leads on measured uptime — Exchange Rates API at —% versus Fed Treasury 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 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?

Neither sends browser-friendly CORS headers reliably, so call Exchange Rates API and Fed Treasury from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

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.