Uniswap Router02 的 getAmountsOut 函数在计算报价时是否考虑池费用？

Question

我想知道Uniswap V2 Router02合约上的getAmountsOut函数在计算出金额时是否考虑到代币的池费，或者我必须自己计算?文档在这方面相当模糊https://docs.uniswap.org/contracts/v2/reference/smart-contracts/library#getamountsout

Uniswap V3 quoteExactInputSingle将池费用作为参数，因此我假设这是在计算中使用的?https://docs.uniswap.org/contracts/v3/reference/periphery/lens/Quoter quoteexactinputsingle

许多谢谢。

Answer 1

您可以在Uniswap v2源代码中查看费用是如何计算的。

下面是来自SushiSwap存储库的匹配示例。你可以看到3/1000(0.30%)是如何计算出来的。输入量和输出量必须满足Uniswap v2费用条件。

// this low-level function should be called from a contract which performs important safety checks
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');
uint balance0;
uint balance1;
{ // scope for _token{0,1}, avoids stack too deep errors
address _token0 = token0;
address _token1 = token1;
require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
balance0 = IERC20Uniswap(_token0).balanceOf(address(this));
balance1 = IERC20Uniswap(_token1).balanceOf(address(this));
}
uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
{ // scope for reserve{0,1}Adjusted, avoids stack too deep errors
uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
}
_update(balance0, balance1, _reserve0, _reserve1);
emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
}