Bitcoin.com Exchange employs a 'maker-taker' model for fees, with the purpose of maximising liquidity and narrowing the spread on our markets, as well as encouraging market-makers.
"Takers" are charged with 0.2% fee from the trade.
"Makers" are charged with 0.15% fee from the trade.
In a maker-taker model the "taker" is a trader who removes the liquidity from the book by placing an order that matches immediately with an existing order on the book. The Taker pays the fee from the committed trade.
The "maker" is a trader who provides liquidity to the order book by placing a limit order below the best ask price for buy and above the best bid price for sell.
If the current sell price for BCH is 400 USDT and you place a market order, your order will be executed immediately. In this case you are acting as a taker and hence will be charged the taker fee of 0.2%.
If the current sell price for BCH is 400 USDT and you place a limit buy order at 395 USDT, you are acting as a maker and will be charged 0.15%