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Contract Name:
KyberConverter
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-12-06 */ pragma solidity ^0.4.24; // File: openzeppelin-eth/contracts/token/ERC20/IERC20.sol /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ interface IERC20 { function totalSupply() external view returns (uint256); function balanceOf(address who) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); function transfer(address to, uint256 value) external returns (bool); function approve(address spender, uint256 value) external returns (bool); function transferFrom(address from, address to, uint256 value) external returns (bool); event Transfer( address indexed from, address indexed to, uint256 value ); event Approval( address indexed owner, address indexed spender, uint256 value ); } // File: openzeppelin-eth/contracts/math/SafeMath.sol /** * @title SafeMath * @dev Math operations with safety checks that revert on error */ library SafeMath { /** * @dev Multiplies two numbers, reverts on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b); return c; } /** * @dev Integer division of two numbers truncating the quotient, reverts on division by zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0); // Solidity only automatically asserts when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Adds two numbers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Divides two numbers and returns the remainder (unsigned integer modulo), * reverts when dividing by zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0); return a % b; } } // File: contracts/dex/ITokenConverter.sol contract ITokenConverter { using SafeMath for uint256; /** * @dev Makes a simple ERC20 -> ERC20 token trade * @param _srcToken - IERC20 token * @param _destToken - IERC20 token * @param _srcAmount - uint256 amount to be converted * @param _destAmount - uint256 amount to get after conversion * @return uint256 for the change. 0 if there is no change */ function convert( IERC20 _srcToken, IERC20 _destToken, uint256 _srcAmount, uint256 _destAmount ) external returns (uint256); /** * @dev Get exchange rate and slippage rate. * Note that these returned values are in 18 decimals regardless of the destination token's decimals. * @param _srcToken - IERC20 token * @param _destToken - IERC20 token * @param _srcAmount - uint256 amount to be converted * @return uint256 of the expected rate * @return uint256 of the slippage rate */ function getExpectedRate(IERC20 _srcToken, IERC20 _destToken, uint256 _srcAmount) public view returns(uint256 expectedRate, uint256 slippageRate); } // File: contracts/dex/IKyberNetwork.sol contract IKyberNetwork { function trade( IERC20 _srcToken, uint _srcAmount, IERC20 _destToken, address _destAddress, uint _maxDestAmount, uint _minConversionRate, address _walletId ) public payable returns(uint); function getExpectedRate(IERC20 _srcToken, IERC20 _destToken, uint _srcAmount) public view returns(uint expectedRate, uint slippageRate); } // File: contracts/libs/SafeERC20.sol /** * @dev Library to perform safe calls to standard method for ERC20 tokens. * Transfers : transfer methods could have a return value (bool), revert for insufficient funds or * unathorized value. * * Approve: approve method could has a return value (bool) or does not accept 0 as a valid value (BNB token). * The common strategy used to clean approvals. */ library SafeERC20 { /** * @dev Transfer token for a specified address * @param _token erc20 The address of the ERC20 contract * @param _to address The address which you want to transfer to * @param _value uint256 the _value of tokens to be transferred */ function safeTransfer(IERC20 _token, address _to, uint256 _value) internal returns (bool) { uint256 prevBalance = _token.balanceOf(address(this)); require(prevBalance >= _value, "Insufficient funds"); _token.transfer(_to, _value); require(prevBalance - _value == _token.balanceOf(address(this)), "Transfer failed"); return true; } /** * @dev Transfer tokens from one address to another * @param _token erc20 The address of the ERC20 contract * @param _from address The address which you want to send tokens from * @param _to address The address which you want to transfer to * @param _value uint256 the _value of tokens to be transferred */ function safeTransferFrom( IERC20 _token, address _from, address _to, uint256 _value ) internal returns (bool) { uint256 prevBalance = _token.balanceOf(_from); require(prevBalance >= _value, "Insufficient funds"); require(_token.allowance(_from, address(this)) >= _value, "Insufficient allowance"); _token.transferFrom(_from, _to, _value); require(prevBalance - _value == _token.balanceOf(_from), "Transfer failed"); return true; } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * * Beware that changing an allowance with this method brings the risk that someone may use both the old * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * @param _token erc20 The address of the ERC20 contract * @param _spender The address which will spend the funds. * @param _value The amount of tokens to be spent. */ function safeApprove(IERC20 _token, address _spender, uint256 _value) internal returns (bool) { bool success = address(_token).call(abi.encodeWithSelector( _token.approve.selector, _spender, _value )); if (!success) { return false; } require(_token.allowance(address(this), _spender) == _value, "Approve failed"); return true; } /** * @dev Clear approval * Note that if 0 is not a valid value it will be set to 1. * @param _token erc20 The address of the ERC20 contract * @param _spender The address which will spend the funds. */ function clearApprove(IERC20 _token, address _spender) internal returns (bool) { bool success = safeApprove(_token, _spender, 0); if (!success) { return safeApprove(_token, _spender, 1); } return true; } } // File: contracts/dex/KyberConverter.sol /** * @dev Contract to encapsulate Kyber methods which implements ITokenConverter. * Note that need to create it with a valid kyber address */ contract KyberConverter is ITokenConverter { using SafeERC20 for IERC20; IKyberNetwork public kyber; address public walletId; uint256 public change; uint256 public prevSrcBalance; uint256 public amount; uint256 public srcAmount; uint256 public destAmount; constructor (IKyberNetwork _kyber, address _walletId) public { kyber = _kyber; walletId = _walletId; } function convert( IERC20 _srcToken, IERC20 _destToken, uint256 _srcAmount, uint256 _destAmount ) external returns (uint256) { srcAmount = _srcAmount; destAmount = _destAmount; // Save prev src token balance prevSrcBalance = _srcToken.balanceOf(address(this)); // Transfer tokens to be converted from msg.sender to this contract require( _srcToken.safeTransferFrom(msg.sender, address(this), _srcAmount), "Could not transfer _srcToken to this contract" ); // Approve Kyber to use _srcToken on belhalf of this contract require( _srcToken.safeApprove(kyber, _srcAmount), "Could not approve kyber to use _srcToken on behalf of this contract" ); // Trade _srcAmount from _srcToken to _destToken // Note that minConversionRate is set to 0 cause we want the lower rate possible amount = kyber.trade( _srcToken, _srcAmount, _destToken, address(this), _destAmount, 0, walletId ); // Clean kyber to use _srcTokens on belhalf of this contract require( _srcToken.clearApprove(kyber), "Could not clean approval of kyber to use _srcToken on behalf of this contract" ); // Check if the amount traded is equal to the expected one require(amount == _destAmount, "Amount bought is not equal to dest amount"); // // Return the change of src token change = _srcToken.balanceOf(address(this)).sub(prevSrcBalance); // require( // _srcToken.safeTransfer(msg.sender, change), // "Could not transfer change to sender" // ); // Transfer amount of _destTokens to msg.sender require( _destToken.safeTransfer(msg.sender, amount), "Could not transfer amount of _destToken to msg.sender" ); return 0; } function transferred(IERC20 _address) public { _address.transfer(msg.sender, change); } function getExpectedRate(IERC20 _srcToken, IERC20 _destToken, uint256 _srcAmount) public view returns(uint256 expectedRate, uint256 slippageRate) { (expectedRate, slippageRate) = kyber.getExpectedRate(_srcToken, _destToken, _srcAmount); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"constant":true,"inputs":[],"name":"srcAmount","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"change","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_srcToken","type":"address"},{"name":"_destToken","type":"address"},{"name":"_srcAmount","type":"uint256"},{"name":"_destAmount","type":"uint256"}],"name":"convert","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_srcToken","type":"address"},{"name":"_destToken","type":"address"},{"name":"_srcAmount","type":"uint256"}],"name":"getExpectedRate","outputs":[{"name":"expectedRate","type":"uint256"},{"name":"slippageRate","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"kyber","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"prevSrcBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"amount","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"destAmount","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"walletId","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_address","type":"address"}],"name":"transferred","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_kyber","type":"address"},{"name":"_walletId","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]
Contract Creation Code
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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)
000000000000000000000000818e6fecd516ecc3849daf6845e3ec868087b755000000000000000000000000db717e3148c09333e21ca93c2c1d4c42ec8b93db
-----Decoded View---------------
Arg [0] : _kyber (address): 0x818E6FECD516Ecc3849DAf6845e3EC868087B755
Arg [1] : _walletId (address): 0xdb717E3148c09333E21ca93c2c1D4C42EC8b93db
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000818e6fecd516ecc3849daf6845e3ec868087b755
Arg [1] : 000000000000000000000000db717e3148c09333e21ca93c2c1d4c42ec8b93db
Swarm Source
bzzr://a360149a42a0cba54f1de955e3cec5696017d9c742f09a5ff3a96733f812878e
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Multichain Portfolio | 24 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.