A form of cross in which two counterparties (a buyer and a seller) get a mid-quote fill price from a reference exchange. The two counterparties place large, offsetting orders in a crossing network, with no limit price- no minimum or maximum price for execution. The resulting cross will occur at the mid-quote price. Initially, neither side incurs transaction fees (hence the cross is frictionless). However, after a cross occurs, both sides usually incur the crossing network fee.