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Helium vs Yahoo Finance Chart

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

APIHeliumNEW—Yahoo Finance ChartNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFirst 50 queries per IP free, no key (paid API key beyond, ~$0.02/query)Free — limits not published
Rate limit50 free queries per IP subnetUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Helium vs Yahoo Finance Chart: common questions

Which is more reliable, Helium or Yahoo Finance Chart?

On our scheduled checks, Yahoo Finance Chart leads on measured uptime — Helium 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 Helium and Yahoo Finance Chart need an API key?

Neither needs a paid key — Helium 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 Helium and Yahoo Finance Chart from the browser?

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

Helium 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.