CongressInvests vs Twelve Data
Same instrument, two spec sheets — measured, not claimed.
CongressInvests vs Twelve Data: common questions
Which is more reliable, CongressInvests or Twelve Data?
On our scheduled checks, CongressInvests leads on measured uptime — CongressInvests at 100% versus Twelve Data at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, CongressInvests or Twelve Data?
Twelve Data has the lower median latency in our checks — CongressInvests responds in 615 ms versus Twelve Data at 253 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 Twelve Data need an API key?
Both ask you to authenticate — CongressInvests uses an API key and Twelve Data uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call CongressInvests and Twelve Data from the browser?
Yes — both CongressInvests and Twelve Data 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 CongressInvests and Twelve Data free for commercial use?
CongressInvests has unclear commercial terms, and Twelve Data 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.