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Frankfurter vs Yahoo Finance Chart

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

APIFrankfurterHEALTHY86Yahoo Finance ChartHEALTHY99
Uptime · 30d
Uptime · 90d88.2%100%
Uptime · 30d86.7%100%
P50 · ms370167
P95 · ms4986407
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic data (ECB reference rates)Unverified
Free tierUnlimited — abuse-rate-limited onlyFree — limits not published
Rate limitUnpublished, generousUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Frankfurter vs Yahoo Finance Chart: common questions

Which is more reliable, Frankfurter or Yahoo Finance Chart?

On our scheduled checks, Yahoo Finance Chart leads on measured uptime — Frankfurter at 88.2% versus Yahoo Finance Chart at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Frankfurter or Yahoo Finance Chart?

Yahoo Finance Chart has the lower median latency in our checks — Frankfurter responds in 370 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 Frankfurter and Yahoo Finance Chart need an API key?

Neither needs a paid key — Frankfurter 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 Frankfurter and Yahoo Finance Chart 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 Frankfurter and Yahoo Finance Chart free for commercial use?

Frankfurter allows commercial use on its free tier, 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.