There is a processing platform model (DD), also known as MM, that is, market maker.
Usually DD foreign exchange trading platform has trading platform or trading desk to process orders, and the spread type is set to fixed. Market makers themselves make profits through spreads, and when necessary, they will trade in reverse with customers, which, as the name implies, is to "make a market" for customers. Such platforms belong to the "manufacturing market". Under certain conditions, market makers will always be in the opposite position to traders and "make market" in the opposite way to traders. Therefore, the spread of the market maker platform is generally fixed, so the risk is relatively small.
2.？ Non-processing platform mode (NDD)
As the name implies, without a trading desk, there is no processing platform. Brokers don't do door-to-door transactions of traders, but only connect traders with the interbank market, so traders can trade directly at the level of the interbank foreign exchange market.
NDD mode can be subdivided into STP, DMA/STP and ESC+STP.
To tell the truth, there are formal ones outside now, but there are only a handful of absolutely formal ones. There are too many big platforms and small platforms to fish in troubled waters. You can check the authenticity of the platform through foreign exchange Tian Yan software.