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Latest 6 from a total of 6 transactions
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Swap Exact ETH F... | 20857002 | 13 days ago | IN | 0.1 ETH | 0.00075102 | ||||
Swap Exact ETH F... | 19873771 | 150 days ago | IN | 0.0308176 ETH | 0.00033609 | ||||
Swap Exact Token... | 19648506 | 182 days ago | IN | 0 ETH | 0.00113387 | ||||
Swap Exact ETH F... | 19611928 | 187 days ago | IN | 0.03792027 ETH | 0.00189773 | ||||
Swap Exact ETH F... | 19594391 | 189 days ago | IN | 0.3 ETH | 0.00058363 | ||||
Swap Exact ETH F... | 19588484 | 190 days ago | IN | 0.01 ETH | 0.0026533 |
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Minimal Proxy Contract for 0x64141fdc3d1399b162abdae25fe26523459fa119
Contract Name:
MintSwapPool
Compiler Version
v0.8.2+commit.661d1103
Optimization Enabled:
Yes with 200 runs
Other Settings:
istanbul EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.2; import "./lib/utils/math/Math.sol"; import "./lib/utils/math/SafeMath.sol"; import "./lib/utils/IMintSwapFactory.sol"; import "./lib/token/ERC20/utils/SafeERC20.sol"; import "./lib/security/ReentrancyGuard.sol"; import "./lib/utils/IFlashLoanReceiver.sol"; import "./MintSwapERC20.sol"; contract MintSwapPool is ERC20, ReentrancyGuard { using SafeMath for uint; using SafeERC20 for IERC20; address public token; address public factory; bool initialized; event Sync(uint reserve0, uint reserve1); 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 FlashLoan( address indexed _target, address indexed _reserve, uint256 _amount, uint256 _totalFee, uint256 _protocolFee, uint256 _timestamp ); modifier ensure(uint deadline) { require(deadline >= block.timestamp, 'MintSwapPool: EXPIRED'); _; } constructor() { } function initialize(address _token) external { require(!initialized, 'MintSwapPool: ALREADY_INITIALIZED'); initialized = true; factory = msg.sender; token = _token; } function safeTransferETH(address to, uint256 value) internal { (bool success, ) = to.call{value: value}(new bytes(0)); require(success, 'MintSwapPool: ETH_TXN_FAILED'); } function token0() external pure returns (address _token) { _token = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; } function token1() external view returns (address _token) { _token = token; } function reserve0() external view returns (uint _reserve0) { _reserve0 = address(this).balance; } function reserve1() external view returns (uint _reserve1) { _reserve1 = IERC20(token).balanceOf(address(this)); } function getReserves() external view returns(uint _reserve0, uint _reserve1, uint _blockTimestampLast) { return ( address(this).balance, IERC20(token).balanceOf(address(this)), block.timestamp ); } function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) public pure returns (uint amountOut) { require(amountIn > 0, 'MintSwapPool: INSUFFICIENT_INPUT_AMOUNT'); require(reserveIn > 0 && reserveOut > 0, 'MintSwapPool: INSUFFICIENT_LIQUIDITY'); uint amountInWithFee = amountIn.mul(997); uint numerator = amountInWithFee.mul(reserveOut); uint denominator = reserveIn.mul(1000).add(amountInWithFee); amountOut = numerator / denominator; } function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) public pure returns (uint amountIn) { require(amountOut > 0, 'MintSwapPool: INSUFFICIENT_OUTPUT_AMOUNT'); require(reserveIn > 0 && reserveOut > 0, 'MintSwapPool: INSUFFICIENT_LIQUIDITY'); uint numerator = reserveIn.mul(amountOut).mul(1000); uint denominator = reserveOut.sub(amountOut).mul(997); amountIn = (numerator / denominator).add(1); } function swapExactETHForTokens(uint amount1min, address to, uint deadline) payable external ensure(deadline) nonReentrant returns (uint amount1) { address _token = token; // gas savings uint reserve0_ = (address(this).balance).sub(msg.value); uint reserve1_ = IERC20(_token).balanceOf(address(this)); amount1 = getAmountOut(msg.value, reserve0_, reserve1_); require(amount1min <= amount1, 'MintSwapPool: SLIPPAGE_REACHED'); IERC20(_token).safeTransfer(to, amount1); emit Swap(msg.sender, msg.value, 0, 0, amount1, to); emit Sync(reserve0_.add(msg.value), reserve1_.sub(amount1)); } function swapETHForExactTokens(uint amount1, address to, uint deadline) payable external ensure(deadline) nonReentrant returns (uint amount0) { address _token = token; // gas savings uint reserve0_ = (address(this).balance).sub(msg.value); uint reserve1_ = IERC20(_token).balanceOf(address(this)); amount0 = getAmountIn(amount1, reserve0_, reserve1_); require(amount0 <= msg.value, 'MintSwapPool: SLIPPAGE_REACHED'); IERC20(_token).safeTransfer(to, amount1); if(msg.value > amount0){ safeTransferETH(msg.sender, msg.value.sub(amount0)); } emit Swap(msg.sender, amount0, 0, 0, amount1, to); emit Sync(reserve0_.add(amount0), reserve1_.sub(amount1)); } function swapExactTokensForETH(uint amount1, uint amount0min, address to, uint deadline) external ensure(deadline) nonReentrant returns (uint amount0) { address _token = token; // gas savings uint reserve0_ = address(this).balance; uint reserve1_ = IERC20(_token).balanceOf(address(this)); IERC20(_token).safeTransferFrom(msg.sender, address(this), amount1); amount1 = (IERC20(_token).balanceOf(address(this))).sub(reserve1_); amount0 = getAmountOut(amount1, reserve1_, reserve0_); require(amount0min <= amount0, 'MintSwapPool: SLIPPAGE_REACHED'); safeTransferETH(to, amount0); emit Swap(msg.sender, 0, amount1, amount0, 0, to); emit Sync(reserve0_.sub(amount0), reserve1_.add(amount1)); } function swapTokensForExactETH(uint amount0, uint amount1max, address to, uint deadline) external ensure(deadline) nonReentrant returns (uint amount1) { address _token = token; // gas savings uint reserve0_ = address(this).balance; uint reserve1_ = IERC20(_token).balanceOf(address(this)); amount1 = getAmountIn(amount0, reserve1_, reserve0_); require(amount1 <= amount1max, 'MintSwapPool: SLIPPAGE_REACHED'); IERC20(_token).safeTransferFrom(msg.sender, address(this), amount1); require(amount1 == (IERC20(_token).balanceOf(address(this))).sub(reserve1_), 'MintSwapPool: DEFLATIONARY_TOKEN_USE_EXACT_TOKENS'); safeTransferETH(to, amount0); emit Swap(msg.sender, 0, amount1, amount0, 0, to); emit Sync(reserve0_.sub(amount0), reserve1_.add(amount1)); } function _addLPinternal(uint amount0min, uint amount1, address from, address to) internal returns (uint lpAmount) { require(msg.value > 0 && amount1 > 0, 'MintSwapPool: INVALID_AMOUNT'); address _token = token; // gas savings uint reserve0_ = (address(this).balance).sub(msg.value); uint reserve1_ = IERC20(_token).balanceOf(address(this)); uint _totalSupply = totalSupply; IERC20(_token).safeTransferFrom(from, address(this), amount1); amount1 = (IERC20(_token).balanceOf(address(this))).sub(reserve1_); uint amount0; if(_totalSupply > 0){ amount0 = ( amount1.mul( reserve0_ ) ).div(reserve1_); require(amount0 <= msg.value, 'MintSwapPool: SLIPPAGE_REACHED_DESIRED'); require(amount0 >= amount0min, 'MintSwapPool: SLIPPAGE_REACHED_MIN'); } else { amount0 = msg.value; } if (_totalSupply == 0) { lpAmount = Math.sqrt(amount0.mul(amount1)).sub(10**3); _mint(address(0), 10**3); } else { lpAmount = Math.min(amount0.mul(_totalSupply) / reserve0_, amount1.mul(_totalSupply) / reserve1_); } require(lpAmount > 0, 'MintSwapPool: INSUFFICIENT_LIQUIDITY_MINTED'); // refund only if value is > 1000 wei if(msg.value > amount0.add(1000)){ safeTransferETH(from, msg.value.sub(amount0)); } uint _fee = IMintSwapFactory(factory).lpFee(); if(_fee > 0){ uint _feeAmount = ( lpAmount.mul(_fee) ).div(10**4); _mint(IMintSwapFactory(factory).feeTo(), _feeAmount); lpAmount = lpAmount.sub(_feeAmount); } _mint(to, lpAmount); emit Mint(from, amount0, amount1); emit Sync(reserve0_.add(amount0), reserve1_.add(amount1)); } function addLPfromFactory(uint amount0min, uint amount1, address from, address to, uint deadline) payable external ensure(deadline) nonReentrant returns (uint lpAmount) { require(msg.sender == factory, 'MintSwapPool: FORBIDDEN'); lpAmount = _addLPinternal(amount0min, amount1, from, to); } function addLP(uint amount0min, uint amount1, address to, uint deadline) payable external ensure(deadline) nonReentrant returns (uint lpAmount) { lpAmount = _addLPinternal(amount0min, amount1, msg.sender, to); } function removeLiquidity(uint lpAmount, address to, uint deadline) external ensure(deadline) nonReentrant returns (uint amount0, uint amount1) { require(lpAmount > 0, 'MintSwapPool: INSUFFICIENT_LIQUIDITY'); address _token = token; // gas savings uint reserve0_ = address(this).balance; uint reserve1_ = IERC20(_token).balanceOf(address(this)); uint _totalSupply = totalSupply; amount0 = lpAmount.mul(reserve0_) / _totalSupply; amount1 = lpAmount.mul(reserve1_) / _totalSupply; require(amount0 > 0 && amount1 > 0, 'MintSwapPool: INSUFFICIENT_LIQUIDITY_BURNED'); _burn(msg.sender, lpAmount); IERC20(_token).safeTransfer(to, amount1); safeTransferETH(to, amount0); emit Burn(msg.sender, amount0, amount1, to); emit Sync(reserve0_.sub(amount0), reserve1_.sub(amount1)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // 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-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a / b + (a % b == 0 ? 0 : 1); } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrt(uint y) internal pure returns (uint z) { if (y > 3) { z = y; uint x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } else if (y != 0) { z = 1; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IMintSwapFactory { function lpFee() external returns (uint); function feeTo() external returns (address); function getFlashLoanFeesInBips() external returns (uint, uint); function totalPairs() external view returns (uint); function getPair(address tokenAddress) external view returns (address pair); function createPair(address tokenAddress) external returns (address pair); function createPairWithAddExactEthLP(address tokenAddress, uint tokenAmountMin, address to, uint deadline) payable external returns (address pair, uint lpAmount); event lpFeeUpdated(uint previousFee, uint newFee); event PairCreated(address indexed tokenAddress, address pair, uint); event flashLoanFeeUpdated(uint flashloan_fee_total, uint flashloan_fee_protocol); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.2; /** * @title IFlashLoanReceiver interface * @notice Interface for IFlashLoanReceiver. * @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract **/ interface IFlashLoanReceiver { function executeOperation(address _reserve, uint256 _amount, uint256 _fee, bytes calldata _params) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: 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 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.2; import "./lib/utils/math/SafeMath.sol"; contract ERC20 { using SafeMath for uint; string public constant name = 'MintSwap LP V1'; string public constant symbol = 'MSWAP-LP1'; uint8 public constant decimals = 18; uint public totalSupply; mapping(address => uint) public balanceOf; mapping(address => mapping(address => uint)) public allowance; event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); constructor() {} function _mint(address to, uint value) internal { totalSupply = totalSupply.add(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(address(0), to, value); } function _burn(address from, uint value) internal { balanceOf[from] = balanceOf[from].sub(value, 'MintSwap: INSUFFICIENT_BALANCE'); totalSupply = totalSupply.sub(value); emit Transfer(from, address(0), value); } function _approve(address owner, address spender, uint value) private { allowance[owner][spender] = value; emit Approval(owner, spender, value); } function _transfer(address from, address to, uint value) private { balanceOf[from] = balanceOf[from].sub(value, 'MintSwap: INSUFFICIENT_BALANCE'); balanceOf[to] = balanceOf[to].add(value); emit Transfer(from, to, value); } function approve(address spender, uint value) external returns (bool) { _approve(msg.sender, spender, value); return true; } function transfer(address to, uint value) external returns (bool) { _transfer(msg.sender, to, value); return true; } function transferFrom(address from, address to, uint value) external returns (bool) { if (allowance[from][msg.sender] != type(uint).max) { allowance[from][msg.sender] = allowance[from][msg.sender].sub(value, 'MintSwap: INSUFFICIENT_ALLOWANCE'); } _transfer(from, to, value); return true; } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "istanbul", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
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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.