{
    "Function": "offerForETH",
    "File": "contracts/RubiconRouter.sol",
    "Parent Contracts": [],
    "High-Level Calls": [
        "ERC20",
        "ERC20",
        "WETH9",
        "RubiconMarket",
        "ERC20"
    ],
    "Internal Calls": [],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function offerForETH(\n        uint256 pay_amt, //maker (ask) sell how much\n        ERC20 pay_gem, //maker (ask) sell which token\n        uint256 buy_amt, //maker (ask) buy how much\n        // ERC20 nativeETH, //maker (ask) buy which token\n        uint256 pos //position to insert offer, 0 should be used if unknown\n    ) external returns (uint256) {\n        ERC20(pay_gem).transferFrom(msg.sender, address(this), pay_amt);\n\n        uint256 _before = ERC20(wethAddress).balanceOf(address(this));\n        uint256 id = RubiconMarket(RubiconMarketAddress).offer(\n            pay_amt,\n            pay_gem,\n            buy_amt,\n            ERC20(wethAddress),\n            pos\n        );\n        uint256 _after = ERC20(wethAddress).balanceOf(address(this));\n        if (_after > _before) {\n            //return any potential fill amount on the offer as native ETH\n            uint256 delta = _after - _before;\n            WETH9(wethAddress).withdraw(delta);\n            msg.sender.transfer(delta);\n        }\n        return id;\n    }"
}