Anyone using Rithmic at the backend. This includes Zen-Fire which is API compatible. Makes that Mirus, Amp, Velocity.
Don't know what are you talking about ...with anyone.. I mean R|Trader execution platform available for retail customers Furthermore Velocity offers Ninja through TT not Zenfire Here's a broker http://www.optimusfutures.com/R-Trader.html
What I meant is that if you get RTrader or have it, there is a version that connects to zen-fire. Have it myself. I use the RApi for my programming against Zen-Fire (I just happen to like the RApi better, due to more features), and use RTrader to check my programming