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by hft_throwaway 4249 days ago
More than when I last looked, but to put that in perspective, you could trade $40mm in a few price ticks in major currency pairs and CME avg daily turnover alone is > $100bn: http://cmegroup.mediaroom.com/2013-06-07-CME-Group-Sees-Reco...

Public spot FX markets and OTC trading do huge volumes too.

Some BTC exchanges charge like 60 bps per trade. Finding a signal to overcome that cost and do enough trading to make it worthwhile would be quite difficult.