Twelve Data vs Yahoo Finance Chart
Same instrument, two spec sheets — measured, not claimed.
Twelve Data vs Yahoo Finance Chart: common questions
Which is more reliable, Twelve Data or Yahoo Finance Chart?
On our scheduled checks, Yahoo Finance Chart leads on measured uptime — Twelve Data at 99.02% 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, Twelve Data or Yahoo Finance Chart?
Yahoo Finance Chart has the lower median latency in our checks — Twelve Data responds in 253 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 Twelve Data and Yahoo Finance Chart need an API key?
Yahoo Finance Chart needs no key, while Twelve Data requires a free API key. If you want to start calling without signup, reach for Yahoo Finance Chart first.
Can I call Twelve Data and Yahoo Finance Chart from the browser?
Only Twelve Data 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 Twelve Data and Yahoo Finance Chart free for commercial use?
Twelve Data 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.