GitHub - Crypto-toolbox_HFT-Orderbook_ Limit Order Book for high-frequency trading (HFT), as described by WK Selph, implemented in Python3 and C - download at 4shared. GitHub - Crypto-toolbox_HFT-Orderbook_ Limit Order Book for high-frequency trading (HFT), as described by WK Selph, implemented in Python3 and C is hosted at free file sharing service 4shared.