Poderá não ter escolhido a melhor opção. Não se trata de intercâmbio de apostas. É um sítio onde é possível fazer apostas. Traduzir "exchange" por "intercâmbio" neste contexto poderá não ser boa ideia...
https://en.wikipedia.org/wiki/Betting_exchangeA betting exchange is a marketplace for customers to bet on the outcome of discrete events.[1] Betting exchanges offer the same opportunities to bet as a bookmaker with a few differences. You can buy (also known as "back") and sell (also known as "lay") the outcome, you can trade in real-time throughout the event and you trade out to cut your losses or lock in profit. Bookmaker operators generate revenue by offering less efficient odds. Betting exchanges normally generate revenue by charging a small commission on winning bets.
A betting exchange is not actually a bookie, it is a match making service that matches bets from backers and layers. this is great for punters because there is no conflict of interest between you and the company. Traditional bookmakers want you to lose. Betting exchanges take a commission on bets so it actually works in their favour if you win as you bet more.