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 alon

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-Record-Trading-in-its-Global-FX-Complex-Transacted-239-billion-in-Notional-Volume-Across-FX-Futures-and-Options?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+mediaroom%2FCMsF+%28CME+Group+Media+Room%29 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.