As of my last update, Betdaq, a betting exchange, typically charges a commission rate on the net winnings from a bet placed on its platform. For the "tennis exchange," the commission rate is generally around 2% for standard accounts, but it can vary based on promotions or the user's betting volume, potentially allowing for lower rates for high-volume traders. The commission is calculated on the net profit made from winning bets after any losses are accounted for. This means if a user wins a bet, the commission is deducted from that profit, while no commission is charged on losing bets. For the most accurate and current details, it's advisable to check Betdaq's official website or customer support.