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Yahoo Finance Chart vs Frankfurter

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

APIYahoo Finance ChartNEW—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree — limits not publishedUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Yahoo Finance Chart vs Frankfurter: common questions

Which is more reliable, Yahoo Finance Chart or Frankfurter?

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

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

Can I call Yahoo Finance Chart and Frankfurter from the browser?

Only Frankfurter 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 Yahoo Finance Chart and Frankfurter free for commercial use?

Yahoo Finance Chart has unclear commercial terms, and Frankfurter 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.