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Congressional Stock Brain vs Exchange Rates API

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

APICongressional Stock BrainNEW—Exchange Rates APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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 Exchange Rates API: common questions

Which is more reliable, Congressional Stock Brain or Exchange Rates API?

On our scheduled checks, Exchange Rates API leads on measured uptime — Congressional Stock Brain at —% versus Exchange Rates API 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 Congressional Stock Brain and Exchange Rates API need an API key?

Neither needs a paid key — Congressional Stock Brain is callable with no signup, and Exchange Rates API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Congressional Stock Brain and Exchange Rates API from the browser?

Only Congressional Stock Brain is browser-friendly — it returns CORS headers over HTTPS. Exchange Rates API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Congressional Stock Brain and Exchange Rates API free for commercial use?

Congressional Stock Brain has unclear commercial terms, and Exchange Rates API 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.