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Congressional Stock Brain vs Frankfurter

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

APICongressional Stock BrainUNMONITORED—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree — limits not publishedUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Congressional Stock Brain vs Frankfurter: common questions

Which is more reliable, Congressional Stock Brain or Frankfurter?

Only Frankfurter is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Congressional Stock Brain and Frankfurter need an API key?

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

Can I call Congressional Stock Brain and Frankfurter from the browser?

Yes — both Congressional Stock Brain and Frankfurter send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Congressional Stock Brain and Frankfurter free for commercial use?

Congressional Stock Brain has unclear commercial terms, and Frankfurter allows commercial use on its free tier. 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.