Contract Source Code (Solidity Standard Json-Input format)

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

/**
 * @title BatchSender
 * @dev A contract that allows batch sending of ETH to multiple recipients
 * @notice This contract enables gas-efficient batch transfers of ETH
 */
contract BatchSender {
    /**
     * @dev Emitted when a batch transfer is executed
     * @param sender The address that initiated the batch transfer
     * @param recipients Array of recipient addresses
     * @param amounts Array of amounts sent to each recipient
     * @param totalAmount Total amount of ETH transferred
     */
    event BatchTransfer(
        address indexed sender,
        address[] recipients,
        uint256[] amounts,
        uint256 totalAmount
    );

    /**
     * @dev Sends ETH to multiple recipients in a single transaction
     * @param recipients Array of recipient addresses
     * @param amounts Array of amounts to send to each recipient (in wei)
     * @notice The msg.value must equal the sum of all amounts
     * @notice Arrays must have the same length
     */
    function batchSendETH(
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external payable {
        require(recipients.length > 0, "BatchSender: No recipients");
        require(recipients.length == amounts.length, "BatchSender: Array length mismatch");

        uint256 totalAmount = 0;

        // Calculate total amount and validate
        for (uint256 i = 0; i < amounts.length; i++) {
            require(amounts[i] > 0, "BatchSender: Amount must be greater than 0");
            totalAmount += amounts[i];
        }

        require(msg.value == totalAmount, "BatchSender: Incorrect ETH amount");

        // Execute transfers
        for (uint256 i = 0; i < recipients.length; i++) {
            require(recipients[i] != address(0), "BatchSender: Invalid recipient address");
            require(recipients[i] != address(this), "BatchSender: Cannot send to contract");

            (bool success, ) = recipients[i].call{value: amounts[i]}("");
            require(success, "BatchSender: Transfer failed");
        }

        emit BatchTransfer(msg.sender, recipients, amounts, totalAmount);
    }

    /**
     * @dev Allows the contract to receive ETH
     */
    receive() external payable {}

    /**
     * @dev Fallback function to receive ETH
     */
    fallback() external payable {}
}

{
  "remappings": [
    "@balancer-labs/v3-interfaces/=lib/balancer-v3-monorepo/pkg/interfaces/",
    "@balancer-labs/v3-vault/=lib/balancer-v3-monorepo/pkg/vault/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "permit2/=lib/permit2/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@ethereum-waffle/=node_modules/@ethereum-waffle/",
    "balancer-v3-monorepo/=lib/balancer-v3-monorepo/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "forge-gas-snapshot/=lib/permit2/lib/forge-gas-snapshot/src/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
    "hardhat/=node_modules/hardhat/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/permit2/lib/solmate/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"address[]","name":"recipients","type":"address[]"},{"indexed":false,"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"totalAmount","type":"uint256"}],"name":"BatchTransfer","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"batchSendETH","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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