UniQuoteChecker

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IV4Quoter {
    struct PoolKey {
        address currency0;
        address currency1;
        uint24 fee;
        int24 tickSpacing;
        address hooks;
    }

    struct QuoteExactSingleParams {
        PoolKey poolKey;
        bool zeroForOne;
        uint128 exactAmount;
        bytes hookData;
    }

    function quoteExactInputSingle(QuoteExactSingleParams memory params)
        external
        returns (uint256 amountOut, uint256 gasEstimate);
}

interface IV3Quoter {
    function quoteExactInputSingle(
        address tokenIn,
        address tokenOut,
        uint24 fee,
        uint256 amountIn,
        uint160 sqrtPriceLimitX96
    ) external returns (uint256 amountOut);
}

contract UniQuoteChecker {
    address public constant TOKEN_SELL = 0x94314a14Df63779c99C0764a30e0CD22fA78fC0E; // 要卖出的代币
    address public constant WETH       = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address public constant USDT       = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
    address public constant ETH        = 0x0000000000000000000000000000000000000000;

    address public constant V4_QUOTER  = 0x52F0E24D1c21C8A0cB1e5a5dD6198556BD9E1203;
    address public constant V3_QUOTER  = 0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6;

    /// @notice 传入卖出数量 (sellAmount) 和 USDT 基准值 (usdtBaseline)，并附带 ETH
    function checkAndPay(uint128 sellAmount, uint256 usdtBaseline) external payable {
        // 1. V4 查询 TOKEN_SELL -> ETH
        IV4Quoter.QuoteExactSingleParams memory params = IV4Quoter.QuoteExactSingleParams({
            poolKey: IV4Quoter.PoolKey({
                currency0: ETH,
                currency1: TOKEN_SELL,
                fee: 3000, // 0.3%
                tickSpacing: 60,
                hooks: address(0)
            }),
            zeroForOne: false, // TOKEN_SELL -> ETH
            exactAmount: sellAmount,
            hookData: ""
        });

        (uint256 ethAmount, ) = IV4Quoter(V4_QUOTER).quoteExactInputSingle(params);

        // 2. V3 查询 ETH -> USDT
        uint256 usdtOut = IV3Quoter(V3_QUOTER).quoteExactInputSingle(
            WETH,
            USDT,
            100, // 0.01%
            ethAmount,
            0
        );

        // 3. 判断差值，如果条件不满足则回滚
        require(usdtOut > usdtBaseline + 30 * 1e6, "Condition not met: diff <= 30 USDT");

        // 条件满足时，转账给 builder (block.coinbase)
        payable(block.coinbase).transfer(msg.value);
    }
}