// SPDX-License-Identifier: MIT pragma solidity ^0.8.7; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } } /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }// 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. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * 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; } } } /** * @dev Interfaces */ interface IUniswapV2Factory { function createPair(address tokenA, address tokenB) external returns (address pair); } interface IUniswapV2Router01 { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint256 amountADesired, uint256 amountBDesired, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity); function addLiquidityETH( address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity); function removeLiquidity( address tokenA, address tokenB, uint256 liquidity, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline ) external returns (uint256 amountA, uint256 amountB); function removeLiquidityETH( address token, uint256 liquidity, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline ) external returns (uint256 amountToken, uint256 amountETH); function removeLiquidityWithPermit( address tokenA, address tokenB, uint256 liquidity, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint256 amountA, uint256 amountB); function removeLiquidityETHWithPermit( address token, uint256 liquidity, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint256 amountToken, uint256 amountETH); function swapExactTokensForTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external returns (uint[] memory amounts); function swapTokensForExactTokens( uint256 amountOut, uint256 amountInMax, address[] calldata path, address to, uint256 deadline ) external returns (uint[] memory amounts); function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to, uint256 deadline) external payable returns (uint[] memory amounts); function swapTokensForExactETH(uint256 amountOut, uint256 amountInMax, address[] calldata path, address to, uint256 deadline) external returns (uint[] memory amounts); function swapExactTokensForETH(uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline) external returns (uint[] memory amounts); function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to, uint256 deadline) external payable returns (uint[] memory amounts); function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) external pure returns (uint256 amountB); function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut) external pure returns (uint256 amountOut); function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut) external pure returns (uint256 amountIn); function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint[] memory amounts); function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint[] memory amounts); } interface IUniswapV2Router02 is IUniswapV2Router01{ function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint256 liquidity, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline ) external returns (uint256 amountETH); function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint256 liquidity, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint256 amountETH); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external; } /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { function totalSupply() external view returns (uint256); function balanceOf(address account) external view returns (uint256); function transfer(address to, uint256 amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 amount) external returns (bool); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); /** * @dev Moves `amount` tokens from `from` to `to` 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 from, address to, 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); } /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); } contract DEXOToken is Context, IERC20, IERC20Metadata, Ownable { receive() external payable {} event SendNative(bool _wallet); using SafeMath for uint256; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 _totalSupply; string private _name; string private _symbol; uint8 private _decimals; // fees & addresses mapping (string => uint) txFees; mapping (address => bool) public feeExempt; mapping (address => bool) public txLimitExempt; address public taxAddress = msg.sender; bool public launched; // taxes for differnet levels struct TokenFee { uint256 forMarketing; uint256 forDev; uint256 forEco; } struct TxLimit { uint256 buyLimit; uint256 sellLimit; uint256 cooldown; bool inactive; mapping(address => uint256) buys; mapping(address => uint256) sells; mapping(address => uint256) lastTx; } TxLimit txLimits; struct SwapToken { uint256 swapTokensAt; uint256 lastSwap; uint256 swapDelay; uint256 minToSend; } SwapToken public swapTokens; IUniswapV2Router02 public uniswapV2Router; address public uniswapV2Pair; constructor() { _name = "DEXO"; _symbol = "DEXO"; _decimals = 18; _totalSupply = 1_000_000_000 * (10 ** decimals()); feeExempt[msg.sender] = true; txLimitExempt[msg.sender] = true; feeExempt[address(this)] = true; txLimitExempt[address(this)] = true; feeExempt[taxAddress] = true; txLimitExempt[taxAddress] = true; /** Set default buy/sell tx fees (no tax on transfers) - marketing, dev, liqudity, farming */ txFees["ecoBuy"] = 100; // 1% txFees["devBuy"] = 100; txFees["marketingBuy"] = 100; txFees["ecoSell"] = 100; txFees["devSell"] = 100; txFees["marketingSell"] = 100; /** Set default tx limits - Cooldown, buy limit, sell limit */ txLimits.cooldown = 30 seconds; txLimits.buyLimit = _totalSupply.div(100); txLimits.sellLimit = _totalSupply.div(100); // auto swap settings swapTokens.swapTokensAt = _totalSupply.div(1394); // 0.1% swapTokens.minToSend = 30_000 ether; swapTokens.swapDelay = 1 minutes; IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E); uniswapV2Router = _uniswapV2Router; _approve(address(this), address(uniswapV2Router), _totalSupply); uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH()); IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max); approve(address(uniswapV2Router), _totalSupply); feeExempt[address(uniswapV2Router)] = true; _balances[msg.sender] = _totalSupply; emit Transfer(address(0), msg.sender, _totalSupply); } /** Sets buy/sell transaction fees */ event Fees( uint256 _ecoBuy, uint256 _devBuy, uint256 _marketingBuy, uint256 _ecoSell, uint256 _devSell, uint256 _marketingSell ); function setFees( uint256 _ecoBuy, uint256 _devBuy, uint256 _marketingBuy, uint256 _ecoSell, uint256 _devSell, uint256 _marketingSell ) external onlyOwner { require(_ecoBuy <= 800, "Marketing fee is too high!"); require(_devBuy <= 800, "Dev fee is too high!"); require(_marketingBuy <= 800, "Farming fee is too high!"); require(_ecoSell <= 800, "Marketing fee is too high!"); require(_devSell <= 800, "Dev fee is too high!"); require(_marketingSell <= 800, "Farming fee is too high!"); txFees["ecoBuy"] = _ecoBuy; txFees["devBuy"] = _devBuy; txFees["marketingBuy"] = _marketingBuy; txFees["ecoSell"] = _ecoSell; txFees["devSell"] = _devSell; txFees["marketingSell"] = _marketingSell; emit Fees( _ecoBuy, _devBuy, _marketingBuy, _ecoSell, _devSell, _marketingSell ); } /** Returns buy/sell transaction fees */ function getFees() public view returns( uint256 ecoBuy, uint256 devBuy, uint256 marketingBuy, uint256 ecoSell, uint256 devSell, uint256 marketingSell ) { return ( txFees["ecoBuy"], txFees["devBuy"], txFees["marketingBuy"], txFees["ecoSell"], txFees["devSell"], txFees["marketingSell"] ); } /** Launch */ function start() external onlyOwner { launched = true; } /** Sets the tax collector contracts */ function setTaxAddress(address _taxAddress) external onlyOwner { taxAddress = _taxAddress; } /** Sets the tax free trading for the specific address */ function setFeeExempt(address _address, bool _value) external onlyOwner { feeExempt[_address] = _value; } /** Sets the limit free trading for the specific address */ function setTxLimitExempt(address _address, bool _value) external onlyOwner { txLimitExempt[_address] = _value; } /** Sets the sell/buy limits & cooldown period */ function setTxLimits(uint256 _buyLimit, uint256 _sellLimit, uint256 _cooldown, bool _inactive) external onlyOwner { require(_buyLimit >= _totalSupply.div(200), "Buy transaction limit is too low!"); // 0.5% require(_sellLimit >= _totalSupply.div(400), "Sell transaction limit is too low!"); // 0.25% require(_cooldown <= 30 minutes, "Cooldown should be 30 minutes or less!"); txLimits.buyLimit = _buyLimit; txLimits.sellLimit = _sellLimit; txLimits.cooldown = _cooldown; txLimits.inactive = _inactive; } /** Sell tokens at */ function setSwapTokens(uint256 _swapTokensAt, uint256 _lastSwap, uint256 _delay) external onlyOwner { swapTokens.swapTokensAt = _swapTokensAt; swapTokens.lastSwap = _lastSwap; swapTokens.swapDelay = _delay; } /** Returns the sell/buy limits & cooldown period */ function getTxLimits() public view returns(uint256 buyLimit, uint256 sellLimit, uint256 cooldown, bool inactive) { return (txLimits.buyLimit, txLimits.sellLimit, txLimits.cooldown, txLimits.inactive); } /** Checks the BUY transaction limits for the specific user with the sent amount */ function checkBuyTxLimit(address _sender, uint256 _amount) internal view { require( txLimits.inactive == true || txLimitExempt[_sender] == true || txLimits.buys[_sender].add(_amount) < txLimits.buyLimit || (txLimits.buys[_sender].add(_amount) > txLimits.buyLimit && txLimits.lastTx[_sender].add(txLimits.cooldown) < block.timestamp), "Buy transaction limit reached!" ); } /** Checks the SELL transaction limits for the specific user with the sent amount */ function checkSellTxLimit(address _sender, uint256 _amount) internal view { require( txLimits.inactive == true || txLimitExempt[_sender] == true || txLimits.sells[_sender].add(_amount) < txLimits.sellLimit || (txLimits.sells[_sender].add(_amount) > txLimits.sellLimit && txLimits.lastTx[_sender].add(txLimits.cooldown) < block.timestamp), "Sell transaction limit reached!" ); } /** Saves the recent buy/sell transactions The function used by _transfer() when the cooldown/tx limit is active */ function setRecentTx(bool _isSell, address _sender, uint256 _amount) internal { if(txLimits.lastTx[_sender].add(txLimits.cooldown) < block.timestamp) { _isSell ? txLimits.sells[_sender] = _amount : txLimits.buys[_sender] = _amount; } else { _isSell ? txLimits.sells[_sender] += _amount : txLimits.buys[_sender] += _amount; } txLimits.lastTx[_sender] = block.timestamp; } /** Returns the recent buys, sells and the last transaction for the specific wallet */ function getRecentTx(address _address) public view returns(uint256 buys, uint256 sells, uint256 lastTx) { return (txLimits.buys[_address], txLimits.sells[_address], txLimits.lastTx[_address]); } /** Automatic swap */ function swapTokensForNative(uint256 _amount) internal { address[] memory path = new address[](2); path[0] = address(this); path[1] = uniswapV2Router.WETH(); _approve(address(this), address(uniswapV2Router), _amount); uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( _amount, 0, path, address(this), block.timestamp ); } function manualSwapTokensForNative(uint256 _amount) external onlyOwner { address[] memory path = new address[](2); path[0] = address(this); path[1] = uniswapV2Router.WETH(); _approve(address(this), address(uniswapV2Router), _amount); uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( _amount, 0, path, address(this), block.timestamp ); } function manualSendNative() external onlyOwner { uint256 contractNativeBalance = address(this).balance; sendNativeTokens(contractNativeBalance); } function withdrawAnyToken(address payable _to, IERC20 _token) public onlyOwner { _token.transfer(_to, _token.balanceOf(address(this))); } function sendNativeTokens(uint256 _amount) private { (bool success, ) = payable(taxAddress).call{value: _amount}(""); emit SendNative(success); } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } function decimals() public view virtual override returns (uint8) { return _decimals; } function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); uint256 ecoFee; uint256 devFee; uint256 marketingFee; bool hasFees = true; // BUY if(from == uniswapV2Pair) { require(launched, "Not launched!"); checkBuyTxLimit(to, amount); setRecentTx(false, to, amount); ecoFee = txFees["ecoBuy"]; devFee = txFees["devBuy"]; marketingFee = txFees["marketingBuy"]; } // SELL else if(to == uniswapV2Pair) { checkSellTxLimit(from, amount); setRecentTx(true, from, amount); ecoFee = txFees["ecoSell"]; devFee = txFees["devSell"]; marketingFee = txFees["marketingSell"]; } unchecked { _balances[from] = fromBalance - amount; } if(feeExempt[to] || feeExempt[from]) { hasFees = false; } if(hasFees && (to == uniswapV2Pair || from == uniswapV2Pair)) { TokenFee memory TokenFees; TokenFees.forMarketing = amount.mul(ecoFee).div(10000); TokenFees.forDev = amount.mul(devFee).div(10000); TokenFees.forEco = amount.mul(marketingFee).div(10000); uint256 totalFees = TokenFees.forMarketing .add(TokenFees.forDev) .add(TokenFees.forEco); amount = amount.sub(totalFees); _balances[address(this)] += totalFees; // dev, lp, marketing fees emit Transfer(from, address(this), totalFees); // If active we do swap uint256 contractTokenBalance = _balances[address(this)]; if ( contractTokenBalance > swapTokens.swapTokensAt && block.timestamp > swapTokens.lastSwap + swapTokens.swapDelay && to == uniswapV2Pair ) { // Balance can be 15% more if(contractTokenBalance > swapTokens.swapTokensAt.mul(1500).div(1000)) { swapTokensForNative(swapTokens.swapTokensAt); } swapTokens.lastSwap = block.timestamp; uint256 contractNativeBalance = address(this).balance; if(contractNativeBalance > swapTokens.minToSend) { sendNativeTokens(contractNativeBalance); } } } _balances[to] += amount; emit Transfer(from, to, amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); } /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) public virtual { _burn(_msgSender(), amount); } }

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