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CongressInvests vs Yahoo Finance Chart

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

APICongressInvestsHEALTHY92Yahoo Finance ChartHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms615167
P95 · ms1338407
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CongressInvests vs Yahoo Finance Chart: common questions

Which is more reliable, CongressInvests or Yahoo Finance Chart?

Both are neck-and-neck — CongressInvests 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, CongressInvests or Yahoo Finance Chart?

Yahoo Finance Chart has the lower median latency in our checks — CongressInvests responds in 615 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 CongressInvests and Yahoo Finance Chart need an API key?

Yahoo Finance Chart needs no key, while CongressInvests requires a free API key. If you want to start calling without signup, reach for Yahoo Finance Chart first.

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

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

CongressInvests 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.