Haim Bodek has published a white paper on his website that you should all read, titled HFT Scalping Strategies. It outlines in a somewhat general way the concept of HFT Scalping Strategies, which serve as a cornerstone of the overwhelming majority of HFT strategies deployed in the market place, including but not limited to rebate arbitrage.
The scalping strategies are “alpha-less”, meaning that they are microstructure oriented – they use features such as the multitude of order types and the low-latency sold by the exchanges in order to gain queue position in the limit order books, as well as the “insurance” against being adversely selected. According to Bodek:
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