在 DEX 交换操作中从硬币中收取费用

Question

一个星期以来，我一直在努力执行一份合同，该合同对DEX交换中使用的硬币收取费用. 看来我无法从输出中读取硬币的SUI金额，因为它是在交易中消耗的. 如果诸如swap_a2b不返回硬币之类的函数，我该如何以原子方式收取费用？

1 Luca · Answer

If you consume the coin for a transaction, it cant be used again. If youre using it for a gas payment, its a one-time use. When it comes to DEX swaps, once you pass a coin like outCoinA in a function swap, it gets consumed, and subsequent calls wont recognize it unless returned explicitly. The main issue could be that swap_a2b doesnt return anything, meaning you cant directly take a fee after a swap operation. A workaround could be to take ownership of the coin to be swapped and, after executing the swap, subtract the fee before transferring the result back to the user.

CarlkawIy · Answer

Wrapping the swap functionality in a smart contract can solve this problem. By executing the swap within the contract, you can manage ownership and distribution to handle fees atomically. The contract would execute the swap, handle the fee subtraction, and then distribute the remaining amount back to the user. Heres an approach in the PTB context: 1. split the coin into a separate coinIn, 2. pass this coin to the smart contract for the swap, fee handling, and return to user step. You dont necessarily need to transfer the coin object explicitly before step 2 if the smart contract takes coinIn by value.

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在 DEX 交换操作中从硬币中收取费用

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