OneSwap supports on-chain order book. Users can place buy and sell orders at a fixed price. All pending orders are stored in the order book of the blockchain, and the system will conduct transaction matching and settlement in terms of the buying and selling orders. In this way, high security and transparency can be guaranteed. However, all operations like order placing, cancellation, etc. need to be confirmed on the chain, and the transaction speed is affected by the public chain network and the transaction fee paid.