"There is no distinction between API orders and orders submitted via TWS with respect to ECN rebates"...
If that is true, that would be great for traders under the fixed tier commission rate. I've been on both fixed and tiered at IB and I never received any rebates while on the fixed commission structure.
Since API routed orders are under fixed treatment ( even if I am tiered for TWS orders ), I will be able to tell you if it is the case soon. But I wouldn't have much hope, this particular IB CS rep gave me numerous false answers.
So if I use Ninjatrader with TWS and place all my orders via NT....is that considered an API routed trade?
TraDaToR, what were your findings? I am also on the tiered system and i want to send orders direct to ARCA through the TWS API.