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// File: WPOL.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;

/**
 * @title WPOL
 * @dev Minimal Wrapped POL (modeled on WETH9).
 *      Users can deposit native Amoy testnet POL to mint WPOL,
 *      or burn WPOL to withdraw POL.
 */
contract WPOL {
    string public name     = "Wrapped POL";
    string public symbol   = "WPOL";
    uint8  public decimals = 18;

    /// @dev Tracks each address’s WPOL balance
    mapping (address => uint256) public balanceOf;
    /// @dev Tracks allowance for each (owner => spender) pair
    mapping (address => mapping (address => uint256)) public allowance;

    /// @dev The total WPOL supply is dynamic and changes with deposit/withdraw
    uint256 public totalSupply;

    /// @dev Event for EIP-20 compliance (transfer)
    event Transfer(address indexed from, address indexed to, uint256 value);
    /// @dev Event for EIP-20 compliance (approval)
    event Approval(address indexed owner, address indexed spender, uint256 value);
    /// @dev Custom event to track deposits of native POL
    event Deposit(address indexed dst, uint256 wad);
    /// @dev Custom event to track withdrawals of POL
    event Withdrawal(address indexed src, uint256 wad);

    /**
     * @notice Deposit native POL to get WPOL
     * @dev Each deposit mints WPOL 1:1 with the amount of POL
     */
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        totalSupply          += msg.value;
        emit Deposit(msg.sender, msg.value);
        emit Transfer(address(0), msg.sender, msg.value);
    }

    /**
     * @notice Withdraw WPOL to get native POL
     * @dev Burns WPOL and sends POL back to caller
     * @param wad Amount of WPOL to burn
     */
    function withdraw(uint256 wad) public {
        require(balanceOf[msg.sender] >= wad, "WPOL: insufficient balance");
        balanceOf[msg.sender] -= wad;
        totalSupply          -= wad;
        emit Withdrawal(msg.sender, wad);
        emit Transfer(msg.sender, address(0), wad);

        // Now send actual native POL
        (bool success, ) = msg.sender.call{value: wad}("");
        require(success, "WPOL: POL transfer failed");
    }

    /**
     * @notice EIP-20 transfer function
     * @dev Normal transfer of WPOL tokens between addresses
     * @param to Recipient address
     * @param value Amount of WPOL
     */
    function transfer(address to, uint256 value) public returns (bool) {
        require(balanceOf[msg.sender] >= value, "WPOL: transfer exceeds balance");
        balanceOf[msg.sender] -= value;
        balanceOf[to]         += value;
        emit Transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @notice EIP-20 approve function
     * @param spender The address allowed to spend your WPOL
     * @param value The max amount they can spend
     */
    function approve(address spender, uint256 value) public returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @notice EIP-20 transferFrom function
     * @dev Allows spender to move WPOL from owner => another address
     * @param from Source address
     * @param to Recipient address
     * @param value Amount of WPOL
     */
    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        require(balanceOf[from] >= value, "WPOL: insufficient from balance");
        require(allowance[from][msg.sender] >= value, "WPOL: allowance too low");

        balanceOf[from]            -= value;
        balanceOf[to]              += value;
        allowance[from][msg.sender] -= value;
        emit Transfer(from, to, value);
        return true;
    }

    /**
     * @notice Fallback to accept plain POL transfers
     * @dev If someone sends native POL directly, treat it as deposit()
     */
    receive() external payable {
        deposit();
    }
}

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

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"dst","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Withdrawal","type":"event"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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