In some embodiments, the instant invention provides for specifically programming a computer machine to perform at lease: receiving, from a trader, a passive indication of interest (IOI) for a financial instrument, where the passive IOI is a bid or an offer and a resting liquidity; classifying the trader as at least: a trading type that is subject to a decline ratio calculation for crossing the passive IOIs, where the decline ratio calculation identifies how many eligible aggressive IOIs have been previously declined by the trader out of a total number of all eligible aggressive IOIs that were offered to such trader; receiving, from another trader, another IOI that is an aggressive IOI, where the aggressive IOI is available to be immediately crossed at the price; and determining, in real-time, an allocation of the aggressive IOI to the trader submitted the passive IOI based on the decline ratio of the trader.