Cleared Trade

[SystemTrading]

I know how to access the DOM, but is there a way to access the number of contracts that took place on the last trade?

[NinjaTrader_Ray]

You would have to monitor OnMarketData() and check for e.MarketDateType == MarketDataType.Last, then check e.Volume.

http://www.ninjatrader-support.com/HelpGuideV6/OnMarketData.html