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Congressional Stock Brain vs Yahoo Finance Chart

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

APICongressional Stock BrainHEALTHY93Yahoo Finance ChartHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms385167
P95 · ms1767407
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

Congressional Stock Brain vs Yahoo Finance Chart: common questions

Which is more reliable, Congressional Stock Brain or Yahoo Finance Chart?

Both are neck-and-neck — Congressional Stock Brain 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, Congressional Stock Brain or Yahoo Finance Chart?

Yahoo Finance Chart has the lower median latency in our checks — Congressional Stock Brain responds in 385 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 Congressional Stock Brain and Yahoo Finance Chart need an API key?

Neither needs a paid key — Congressional Stock Brain 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 Congressional Stock Brain and Yahoo Finance Chart from the browser?

Only Congressional Stock Brain 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 Congressional Stock Brain and Yahoo Finance Chart free for commercial use?

Congressional Stock Brain 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.