About: The Straight Through Processing (STP) business model refers to the Forex Brokers that basically act as the middle man between the traders and the Liquidity Providers. However, Liquidity Providers can either be an ECN Broker/ECN Environment or a Market Maker Broker. - The STP model is generally known due to the no conflict of interest between the traders and the STP Broker. The STP Broker profits only from the trades that pass through its system. The Broker receives the price feed from an ECN Broker or a Market Maker and widens the spread that offers to its clients. Therefore, the more the trades the bigger the profits are for the Broker. - Some may argue that they will receive better trading terms if they register directly with a Liquidity Provider or the Market Maker. By doing so they will receive raw spreads but you need to take into account that such Brokers usually connect their systems directly with an ECN environment that is consisted mainly from Banks that the latter do not accept retail clients. Even if you find out the Maker Maker Broker that offers the liquidity to the STP Broker then you should take into account that probably the STP Broker received better trading terms due to the volume produced and the amount deposited with the Market Maker comparing to your volume and your amount deposited to the Market Maker.