Market makers usually offer you their own costs, based totally on the price that they expect to get on the ECN. When you open a deal they need to match it in the ECN to cover their risk. Clearly here there’s room for the price to modify in the instant between you clicking the button and the deal going on to the ECN. This is slippage. For this reason scalpers and market makers are not a good mix and could be unwelcome. On the positive side, market makers can be a good choice for a beginner. This is a really important factor for many new traders selecting forex brokers.