Recently, I’ve been looking into MyStonks and learned that they currently use the PFOF (Payment for Order Flow) model. The core of this model lies in the execution process of users' buy and sell orders: MyStonks doesn’t handle transactions directly but instead passes users' orders to partnered market makers for execution. The market makers match orders based on the real market order book, ensuring that users can trade at prices close to the market rate. Unlike the AMM (Automated Market Maker) mechanism, which relies on liquidity pools and algorithmic pricing, PFOF doesn’t use preset liquidity pools or pricing formulas. Instead, it depends on real-time quotes and depth provided by market makers in the actual market. By integrating real market order flows and utilizing the PFOF model, MyStonks not only maintains price transparency and consistency with the market but also achieves high execution efficiency.