Ok, guys, I got info.
Refco-Pro : They say currently working on, more than months away.
RefcoXpress : API currently Available
eSignal@Refco : This eSignal version looks containing RefcoXpress engine, and eSignal has its own API which I already uses. This API Ordering function takes over RefcoAPI somehow.
As Saxon mentioned, using eSignal@Refco has an advantage of eliminating another broker trading software and streaming quote data fee.
This looks the way to go for me.
cf) eSignal API for ordering is very primitive, but sufficient for me.
TWS API is far more superior in terms of ordering and its various feedback.
I am not a scalper, so lightspeed executions is not so critical for me. Simply, I really liked the integration of eSignal@Refco, more importantly, the eSignal API is already familiar to me.