Is Integral the former ChoiceFx/CAX offering that vCap used for it's aggregated price feeds? I noticed on their page that this is the name of the software now used - is it just CAX in new clothes?
I was actually just wondering about CAX...I do not see CAX mentioned on vcapfx's site anymore? Does ChoiceFX has anything to do with CAX? As far as I know ChoiceFX is delivered by CTNSystems: http://www.ctnsystems.com/ We did by the way try to connect to ChoiceFX...but certain considerations led us to abandon that project...
Both Integral and ChoiceFX are software solutions only. You can either use your existing lines with supported destinations OR use your (prime) broker's lines to trade. They only provide the frontend, backend and connectivity.
Try Rithmic - they've got FIX gateway. I used to connect to IB via FIX and it was pretty reliable but dead slow - ACKs over 300ms or something...