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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title ProxyMassBuyer (stealth multi-router)
 *
 * Performs a series of single-hop swaps (WETH -> TOKEN) directly through the
 * TOKEN/WETH pair but bundles them into ONE external call using the zero
 * selector (0x00000000).  Each recipient in the provided list receives an
 * equal share of the supplied ETH which is swapped for tokens on their behalf.
 *
 * Calldata layout after the first 4 zero bytes (dynamic length):
 *   0x04  – 0x23   address  token        – token paired with WETH
 *   0x24  – 0x43   uint256  offset       – ABI dynamic offset to recipients[]
 *   0x44  – …      address[] recipients  – list of recipient wallets
 *
 * The ETH sent with the transaction is wrapped into WETH **once** and then
 * evenly split across all recipients when executing the swaps.
 */

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint256 value) external returns (bool);
}

interface IUniswapV2Pair {
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112, uint112, uint32);
}

interface IDexRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
}

interface IUniswapV2Factory {
    function getPair(address tokenA, address tokenB) external view returns (address);
}

interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
}

contract ProxyMassBuyer {
    address public owner;
    IWETH  public immutable WETH;
    address public immutable uniswapV2Router;
    address public immutable uniswapV2Factory;

    modifier onlyOwner() {
        require(msg.sender == owner, "PMB:not owner");
        _;
    }

    constructor() {
        owner = msg.sender;

        address _router = _getDEXRouterAddress();
        uniswapV2Router  = _router;
        uniswapV2Factory = IDexRouter(_router).factory();
        WETH = IWETH(IDexRouter(_router).WETH());
    }

    /* ---------------------- admin helpers ---------------------- */

    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "PMB:zero owner");
        owner = newOwner;
    }

    function rescue(address token, uint256 amount) external onlyOwner {
        if (token == address(0)) {
            (bool ok, ) = owner.call{value: amount}("");
            require(ok, "PMB:ETH xfer fail");
        } else {
            (bool ok, ) = token.call(abi.encodeWithSignature("transfer(address,uint256)", owner, amount));
            require(ok, "PMB:ERC20 xfer fail");
        }
    }

    receive() external payable {}

    /* ------------------- internal helpers ------------------- */

    function _getDEXRouterAddress() internal view returns (address) {
        if (block.chainid == 1) {
            return 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // Uniswap V2 (Ethereum)
        } else if (block.chainid == 56) {
            return 0x10ED43C718714eb63d5aA57B78B54704E256024E; // PancakeSwap V2 (BSC)
        } else {
            revert("Chain ID not supported");
        }
    }

    function _estimateAmountOut(address pair, bool wethIs0, uint amountIn) internal view returns (uint amountOut) {
        (uint112 r0, uint112 r1, ) = IUniswapV2Pair(pair).getReserves();
        uint reserveIn  = wethIs0 ? uint(r0) : uint(r1);
        uint reserveOut = wethIs0 ? uint(r1) : uint(r0);
        require(reserveIn > 0 && reserveOut > 0, "PMB:bad reserves");

        uint amountInWithFee = amountIn * 997;
        uint numerator   = amountInWithFee * reserveOut;
        uint denominator = reserveIn * 1000 + amountInWithFee;
        amountOut = numerator / denominator;
    }

    function _swap(address pair, bool wethIs0, uint amountOut, address recipient) internal {
        IUniswapV2Pair(pair).swap(
            wethIs0 ? uint256(0) : amountOut,
            wethIs0 ? amountOut : uint256(0),
            recipient,
            ""
        );
    }

    /* ---------------- stealth multi-swap entry ---------------- */

    fallback() external payable {
        /* ------------------------------------------------------------
           1) verify selector & minimal calldata length (>= 0x84)
           ----------------------------------------------------------*/
        bytes4 selector;
        assembly {
            selector := shr(224, calldataload(0))
        }
        require(selector == 0x00000000, "PMB:bad selector");
        require(msg.data.length >= 0x84, "PMB:calldata short");

        /* ------------------------------------------------------------
           2) decode params – tokenOut & recipients[]
           ----------------------------------------------------------*/
        (address tokenOut, address[] memory recipients) = abi.decode(msg.data[4:], (address, address[]));
        uint n = recipients.length;
        require(n > 0, "PMB:no recipients");
        uint256 amountETH = msg.value;
        require(amountETH > 0, "PMB:no ETH");
        require(tokenOut != address(0), "PMB:token zero");

        /* ------------------------------------------------------------
           3) obtain TOKEN/WETH pair & position of WETH
           ----------------------------------------------------------*/
        address pair = IUniswapV2Factory(uniswapV2Factory).getPair(tokenOut, address(WETH));
        require(pair != address(0), "PMB:no pair");

        address t0 = IUniswapV2Pair(pair).token0();
        address t1 = IUniswapV2Pair(pair).token1();
        bool wethIs0 = (t0 == address(WETH));
        require(wethIs0 ? t1 == tokenOut : t0 == tokenOut, "PMB:pair mismatch");

        /* ------------------------------------------------------------
           4) wrap ETH once into WETH
           ----------------------------------------------------------*/
        WETH.deposit{value: amountETH}();

        /* ------------------------------------------------------------
           5) compute per-recipient share (handle remainder)
           ----------------------------------------------------------*/
        uint256 share = amountETH / n;
        require(share > 0, "PMB:tiny share");
        uint256 remainder = amountETH - share * n;

        /* ------------------------------------------------------------
           6) loop over recipients & perform swaps
           ----------------------------------------------------------*/
        for (uint i = 0; i < n; ++i) {
            address rcpt = recipients[i];
            require(rcpt != address(0), "PMB:bad rcpt");

            uint256 thisShare = share;
            if (i == n - 1) thisShare += remainder; // add leftover to last swap

            // transfer WETH to pair
            require(WETH.transfer(pair, thisShare), "PMB:WETH xfer fail");

            uint amountOutExpected = _estimateAmountOut(pair, wethIs0, thisShare);

            uint balanceBefore = IERC20(tokenOut).balanceOf(rcpt);
            _swap(pair, wethIs0, amountOutExpected, rcpt);
            require(IERC20(tokenOut).balanceOf(rcpt) > balanceBefore, "PMB:no recv");
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniswapV2Factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"uniswapV2Router","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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