Market makers usually offer you their own prices, based totally on the price that they are expecting 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 switch in the moment between you clicking the button and the deal going on to the ECN. This is slippage. For that reason scalpers and market makers are not a good mix and could be unwelcome.

On the positive side, market makers could be a good choice for an amateur. This is a really significant factor for many new traders choosing forex brokers.