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Exchange Rates API vs Yahoo Finance Chart

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

APIExchange Rates APIHEALTHY88Yahoo Finance ChartHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms810167
P95 · ms4162407
Authnonenone
CORSyesno
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?

Both are neck-and-neck — Exchange Rates API and Yahoo Finance Chart each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Exchange Rates API or Yahoo Finance Chart?

Yahoo Finance Chart has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus Yahoo Finance Chart at 167 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 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?

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

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.