Is the earliest time 8:00 Eastern? Is there anyway for a trader using an American broker to place orders before?
Yes, you can place orders before 8 AM EST if your broker offers it and has routing to ECNs showing quotes. Keep in mind that unless there's news, that early in the day most stocks trade by appointment (very low liquidity) with wide spreads.
Dya think that contacting IB might give you the answers? If you open an order ticket and click destination, it wiill list available ECNs. I can''t tell you how early they trade since I don't log in until 7 AM.