Contract

0x8fD3D838ffCEeB4FF4Dd5B0221A99C3B1dDB9aC9

Source Code

Overview

ETH Balance

0 ETH

Eth Value

$0.00

More Info

Private Name Tags

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ContractCreator

0xfbbDEc9B...D41A35980 at txn 0x18d1bff8ef51ffbbd388603b7550dc3de7ee99029569b65978bceb32b1f09778

Multichain Info

$0 (Multichain Portfolio)

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Contract Source Code Verified (Exact Match)

Contract Name:

UniswapV2PriceOracle

Compiler Version

v0.7.0+commit.9e61f92b

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion, Apache-2.0 license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2020-08-26
*/

// SPDX-License-Identifier: UNLICENSED
// https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/interfaces/IUniswapV2Pair.sol
pragma solidity ^0.7.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}
// https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/interfaces/IUniswapV2Factory.sol


interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}
// Copyright 2017 Loopring Technology Limited.



/// @title Utility Functions for uint
/// @author Daniel Wang - <[email protected]>
library MathUint
{
    function mul(
        uint a,
        uint b
        )
        internal
        pure
        returns (uint c)
    {
        c = a * b;
        require(a == 0 || c / a == b, "MUL_OVERFLOW");
    }

    function sub(
        uint a,
        uint b
        )
        internal
        pure
        returns (uint)
    {
        require(b <= a, "SUB_UNDERFLOW");
        return a - b;
    }

    function add(
        uint a,
        uint b
        )
        internal
        pure
        returns (uint c)
    {
        c = a + b;
        require(c >= a, "ADD_OVERFLOW");
    }
}

// Copyright 2017 Loopring Technology Limited.



/// @title PriceOracle
interface PriceOracle
{
    // @dev Return's the token's value in ETH
    function tokenValue(address token, uint amount)
        external
        view
        returns (uint value);
}
// Copyright 2017 Loopring Technology Limited.








/// @title Uniswap2PriceOracle
/// @dev Returns the value in Ether for any given ERC20 token.
contract UniswapV2PriceOracle is PriceOracle
{
    using MathUint   for uint;

    IUniswapV2Factory factory;
    address wethAddress;

    constructor(
        IUniswapV2Factory _factory,
        address           _wethAddress
        )
    {
        factory = _factory;
        wethAddress = _wethAddress;
        require(_wethAddress != address(0), "INVALID_WETH_ADDRESS");
    }

    function tokenValue(address token, uint amount)
        external
        view
        override
        returns (uint)
    {
        if (amount == 0) return 0;
        if (token == address(0) || token == wethAddress) return amount;

        address pair = factory.getPair(token, wethAddress);
        if (pair == address(0)) {
            return 0;
        }

        (uint112 reserve0, uint112 reserve1,) = IUniswapV2Pair(pair).getReserves();

        if (reserve0 == 0 || reserve1 == 0) {
            return 0;
        }

        if (token < wethAddress) {
            return amount.mul(reserve1) / reserve0;
        } else {
            return amount.mul(reserve0) / reserve1;
        }
    }
}

Contract Security Audit

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Contract ABI

[{"inputs":[{"internalType":"contract IUniswapV2Factory","name":"_factory","type":"address"},{"internalType":"address","name":"_wethAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"tokenValue","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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

Deployed Bytecode

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

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000005c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : _factory (address): 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f
Arg [1] : _wethAddress (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000005c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

Deployed Bytecode Sourcemap

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Swarm Source

ipfs://0d4aabfbb8d256f4cbcf777c7bd3731be119dc2d39fda35b454aae27185503bd

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