On Primex, when swapping, opening a position, or creating a limit order, you can select a specific DEX you want the order to be executed. This can be done in the trading widget under More options.
As a DEX aggregator, Primex also offers its own liquidity aggregation mechanism to trade on multiple DEXs at the same time finding optimal prices and avoiding slippage and high price impact. To learn more, please see Primex DEX liquidity aggregation.