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/**
 *Submitted for verification at Etherscan.io on 2020-04-06
*/

pragma solidity 0.5.15;

// https://github.com/makerdao/sai/blob/master/src/tap.sol
contract SaiTapInterface {
    function sai() public view returns (address);
    function cash(uint256) public;
}

contract TokenInterface {
    function approve(address, uint256) public;
    function transferFrom(address, address, uint256) public returns (bool);
    function withdraw(uint256) public;
    function balanceOf(address) public view returns (uint256);
}

// User must approve() this contract on Sai prior to calling.
contract CageFree {

    address public tap;
    address public sai;
    address public weth;

    event FreeCash(address sender, uint256 amount);

    constructor(address _tap, address _weth) public {
        tap  = _tap;
        sai  = SaiTapInterface(tap).sai();
        weth = _weth;
        TokenInterface(sai).approve(tap, uint256(-1));
    }

    function freeCash(uint256 wad) public returns (uint256 cashoutBalance) {
        TokenInterface(sai).transferFrom(msg.sender, address(this), wad);
        SaiTapInterface(tap).cash(wad);
        cashoutBalance = TokenInterface(weth).balanceOf(address(this));
        require(cashoutBalance > 0, "Zero ETH value");
        TokenInterface(weth).withdraw(cashoutBalance);
        msg.sender.transfer(cashoutBalance);
        emit FreeCash(msg.sender, cashoutBalance);
    }

    function() external payable {
        require(msg.sender == weth, "Only WETH can send ETH");
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_tap","type":"address"},{"internalType":"address","name":"_weth","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FreeCash","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":false,"inputs":[{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"freeCash","outputs":[{"internalType":"uint256","name":"cashoutBalance","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"sai","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"tap","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"weth","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]

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000000000000000000000000bda109309f9fafa6dd6a9cb9f1df4085b27ee8ef000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : _tap (address): 0xBda109309f9FafA6Dd6A9CB9f1Df4085B27Ee8eF
Arg [1] : _weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000bda109309f9fafa6dd6a9cb9f1df4085b27ee8ef
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

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bzzr://f59a08911359926a76cfa3c2423912b0854703974e3eb73aefbba2640ac98ee0