ETH Price: $3,393.64 (-1.40%)
Gas: 3 Gwei

Contract

0xa52bfFAD02B1FE3f86A543a4e81962d3B3bB01A7
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

More Info

Private Name Tags

TokenTracker

Duckereum (DUCKER) (@$0.0029)

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Value
Transfer201885502024-06-28 6:59:5930 hrs ago1719557999IN
Duckereum: DUCKER Token
0 ETH0.000145722.40696055
Approve201798112024-06-27 1:42:592 days ago1719452579IN
Duckereum: DUCKER Token
0 ETH0.000152893.25634292
Approve201793602024-06-27 0:12:112 days ago1719447131IN
Duckereum: DUCKER Token
0 ETH0.000161043.41419729
Approve201557052024-06-23 16:52:595 days ago1719161579IN
Duckereum: DUCKER Token
0 ETH0.000222014.7332589
Approve201527412024-06-23 6:54:236 days ago1719125663IN
Duckereum: DUCKER Token
0 ETH0.000050812.03702245
Approve201435062024-06-21 23:55:117 days ago1719014111IN
Duckereum: DUCKER Token
0 ETH0.000085652.87626078
Approve201434722024-06-21 23:48:117 days ago1719013691IN
Duckereum: DUCKER Token
0 ETH0.000135162.88312483
Approve201179892024-06-18 10:15:4711 days ago1718705747IN
Duckereum: DUCKER Token
0 ETH0.000299836.34847947
Approve201109002024-06-17 10:26:3512 days ago1718619995IN
Duckereum: DUCKER Token
0 ETH0.00023685.02040322
Approve200914572024-06-14 17:11:4714 days ago1718385107IN
Duckereum: DUCKER Token
0 ETH0.0011240723.9342622
Approve200861872024-06-13 23:31:4715 days ago1718321507IN
Duckereum: DUCKER Token
0 ETH0.000244479.80070168
Approve200834072024-06-13 14:10:1115 days ago1718287811IN
Duckereum: DUCKER Token
0 ETH0.0007330515.54093823
Approve200705072024-06-11 18:54:1117 days ago1718132051IN
Duckereum: DUCKER Token
0 ETH0.0005372211.4533654
Approve200544032024-06-09 12:55:3520 days ago1717937735IN
Duckereum: DUCKER Token
0 ETH0.00074315.75205846
Approve200495962024-06-08 20:48:1120 days ago1717879691IN
Duckereum: DUCKER Token
0 ETH0.000354877.52352537
Approve200318242024-06-06 9:14:3523 days ago1717665275IN
Duckereum: DUCKER Token
0 ETH0.0010422522.06819813
Approve200276412024-06-05 19:12:5923 days ago1717614779IN
Duckereum: DUCKER Token
0 ETH0.0016640635.2787664
Approve200207802024-06-04 20:15:1124 days ago1717532111IN
Duckereum: DUCKER Token
0 ETH0.0006166313.05628266
Approve200183532024-06-04 12:07:2325 days ago1717502843IN
Duckereum: DUCKER Token
0 ETH0.0004806815.98616949
Approve200056862024-06-02 17:40:1126 days ago1717350011IN
Duckereum: DUCKER Token
0 ETH0.0006345313.51073411
Approve200047562024-06-02 14:33:1126 days ago1717338791IN
Duckereum: DUCKER Token
0 ETH0.00043459.25163162
Approve200046502024-06-02 14:11:4726 days ago1717337507IN
Duckereum: DUCKER Token
0 ETH0.000584812.38231325
Approve199971042024-06-01 12:55:4728 days ago1717246547IN
Duckereum: DUCKER Token
0 ETH0.000372697.93563801
Approve199697282024-05-28 17:02:2331 days ago1716915743IN
Duckereum: DUCKER Token
0 ETH0.0012505426.62720875
Approve199566562024-05-26 21:11:5933 days ago1716757919IN
Duckereum: DUCKER Token
0 ETH0.00033847.16512404
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Contract Source Code Verified (Exact Match)

Contract Name:
Duckereum

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 7 : Duckereum.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;


/*
*         _          _          _          _          _          _          _           
*       >(')____,  >(')____,  >(')____,  >(')____,  >(')____,  >(')____,  >(')____,  
*         (` =~~/    (` =~~/    (` =~~/    (` =~~/    (` =~~/    (` =~~/    (` =~~/   
*     ^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^
*
*     GM DUCKERS,
*
*     Ah, we see you. You're thinking it's yet another meme currency... 
*     You're wrong. Well, yes, of course, Duckereum is a meme currency, 
*     but it is (according to us) the only one that exists besides Dogecoin.
*
*     Duckereum has no other purpose than to make crypto fun again.
*     We have no marketcap goals, we don't encourage people to buy,
*     we don't use weird techniques to inflate the US dollar value of our token.
*     
*     We're here to have a good time with you. Every week, 
*     a meme contest is organised by the team, the community votes the winner
*     who then receives a number of Duckereums known in advance,
*     regardless of its value in US dollars. Every week, 
*     Mark Duckerberg, the project's creator, keeps a diary
*     in which he tells the story of the Duckereum adventure. 
*      
*     No burn, no tax, no inflation, no deflation, no buy back,
*     locked liquidity and renounced contract.
*     Community spirit and lightness are at the heart of Duckereum.
*     For us, it's all about the adventure, not the ranking on CoinMarketCap.
*     Do you like it? Then, join us!
*     You don't have to buy Duckereum, just bring your good humour and sympathy,
*     and take part in our meme contests to win some Duckereum.
*     
*     See you soon, duckers!
*     
*     Website:      https://duckereum.com
*     Reddit:       https://reddit.com/r/duckereum
*     Twitter:      https://twitter.com/duckereum
*     Telegram:     https://t.me/duckereum
*     Medium:       https://duckereum.medium.com
*     
*
*     888888ba                    dP                                                      
*     88    `8b                   88                                                      
*     88     88 dP    dP .d8888b. 88  .dP  .d8888b. 88d888b. .d8888b. dP    dP 88d8b.d8b. 
*     88     88 88    88 88'  `"" 88888"   88ooood8 88'  `88 88ooood8 88    88 88'`88'`88 
*     88    .8P 88.  .88 88.  ... 88  `8b. 88.  ... 88       88.  ... 88.  .88 88  88  88 
*     8888888P  `88888P' `88888P' dP   `YP `88888P' dP       `88888P' `88888P' dP  dP  dP   
*                                                                                                           
*                                         
*
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&BY?!~7YPGPYYY5G#&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@P7~^:..........:::~Y@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&J!!!~...............^J@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@5?5?!~~..............~^Y@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#P@@Y~~~^............^!?~&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&B#Y~~~J?~:::::::~~..:P@5&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@G7!~~~YPPP55YYYYYJJ::^^&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@G?~~~!5GGGPGPYYYYYJY!.~!Y&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@J~~~~~YBGGGGGPP5PP5Y5Y:.~?B@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@J.::.!YGGGGGGPPP55PPPPP7..:^P@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@5....~Y5555YYYJJ?JJJJY55Y:...:P@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@P:...:!~~~!!!!^^^^~~!777777~. .^&@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@!......:^^^^^^^^^^^^^^~~^^^^... J@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@Y.....  ^^^^^^^^^^^^^^^^^:......J@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@P.....        .:......::.   ....B@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@&^....                     ... 7@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@B^^::................  ..... 7@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@Y~~~~^^^^^^^^^^^:..........5@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@7~~~~!^::^^:::^^........:#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@5~~~~:.................~@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@P~~~~^................^B@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@7~~~~.................!&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@J!~~~~:...............:&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@@@@@#Y?~~~~~~^:.......:.....^P@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@@@BY!!~~~~~~~~!:.............:!&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@@@@57~~~~~~~~~~~~:..............:5@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@@@@#5J~^^^~~~~~^::...............^:^G@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@@@&P5!^^~~^:~~~~~....................:5@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@&Y~~~~^^~~~~~~^:......................~?&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@@@@B~~~~~^~~~~^~~........................^~7@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@@@&GP?~~~~~^^~~~^^..........................~B@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@@#5?^~^^~^:~:~~::.. .........................:Y@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*@@@@@@G^^^::.::^^^:^^^.............................:~7#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
*
*
*     
*     Duckereum, by Mark Duckerberg
*            	    Warren Duckett 
*            	    M0THER Ducker 
*
*
*/


import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

contract Duckereum is ERC20, Ownable {

    using SafeMath for uint256;

    mapping(address => bool) private pair;
    bool public tradingOpen;
    uint256 public _maxWalletSize = 1000000 * 10 ** decimals();
    uint256 private _totalSupply = 100000000 * 10 ** decimals();

    constructor() ERC20("Duckereum", "DUCKER") {

        _mint(msg.sender, 100000000 * 10 ** decimals());
        
    }

    function addPair(address toPair) public onlyOwner {
        require(!pair[toPair], "This pair is already excluded");
        pair[toPair] = true;
    }

    function setTrading(bool _tradingOpen) public onlyOwner {
        tradingOpen = _tradingOpen;
    }

    function setMaxWalletSize(uint256 maxWalletSize) public onlyOwner {
        _maxWalletSize = maxWalletSize;
    }

    function removeLimits() public onlyOwner{
        _maxWalletSize = _totalSupply;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

       if(from != owner() && to != owner()) {

            //Trade start check
            if (!tradingOpen) {
                require(from == owner(), "TOKEN: This account cannot send tokens until trading is enabled");
            }

            //buy 
            
            if(from != owner() && to != owner() && pair[from]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "TOKEN: Amount exceeds maximum wallet size");
                
            }
            
            // transfer
           
            if(from != owner() && to != owner() && !(pair[to]) && !(pair[from])) {
                require(balanceOf(to) + amount <= _maxWalletSize, "TOKEN: Balance exceeds max wallet size!");
            }

       }

       super._transfer(from, to, amount);

    }

}

File 2 of 7 : SafeMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.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.
 */
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 subtraction 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;
        }
    }
}

File 3 of 7 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @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 ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @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.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @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;
    }

    /**
     * @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}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    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 `from` to `to`.
     *
     * 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");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, 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");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), 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 Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 4 of 7 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.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.
 */
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);
    }
}

File 5 of 7 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

File 6 of 7 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @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);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 7 of 7 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `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);
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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OVERVIEW

Duckereum is a real, light and fun meme currency that aims to revive the foundations of Dogecoin.

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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.