Straight Through Processing (STP) forex brokers sent their customers' orders directly to the liquidity providers (banks or larger brokers) without running them through a dealing desk. This means that orders are filled without unnecessary delays, and that ideally, with STP execution there are no re-quotes.
One of the big advantages of STP execution is that with it, the clients' losses are not brokers' profits - in fact, STP brokers make money by adding a small commission, or markup to the spread. Whether a trader wins or loses, the broker gets the same markup, therefore there is no conflict of interest between the two parties. This is a definite advantage to market makers – when trading with a market making broker, your losses are the broker's gains; STP brokers, on the contrary, benefit more from winning traders who trade more and the broker thus gets more commission/markup fees.
Some brokers only offer one liquidity provider, others give traders access to a deeper liquidity pool (FXCM, for example, offers liquidity from more than 10 banks). Obviously, the more liquidity providers there are, the better order executions.
Similarly, No Dealing Desk (NDD) brokers offer traders access to the interbank forex market. Again, here there are no delays in filling orders, no re-quotes, and no conflict of interest. NDD forex brokers could offer either STP or ECN execution.
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