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Exchange Rates API vs Yahoo Finance Chart

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

APIExchange Rates APINEW—Yahoo Finance ChartNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
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 Yahoo Finance Chart: common questions

Which is more reliable, Exchange Rates API or Yahoo Finance Chart?

On our scheduled checks, Yahoo Finance Chart leads on measured uptime — Exchange Rates API at —% versus Yahoo Finance Chart 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 Yahoo Finance Chart need an API key?

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

Can I call Exchange Rates API and Yahoo Finance Chart from the browser?

Neither sends browser-friendly CORS headers reliably, so call Exchange Rates API and Yahoo Finance Chart 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 Yahoo Finance Chart free for commercial use?

Exchange Rates API has unclear commercial terms, and Yahoo Finance Chart 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.