Feature Tip: Add private address tag to any address under My Name Tag !
Overview
Max Total Supply
1,000,000,000 YGG
Holders
23,285 ( -0.026%)
Market
Price
$0.54 @ 0.000168 ETH (+2.52%)
Onchain Market Cap
$538,096,000.00
Circulating Supply Market Cap
$207,187,989.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Gate.io | YGG-USDT | $0.5373 0.0001681 Eth | $41,338,778.00 76,942,175.160 YGG | 23.8735% |
2 | BTCC | YGG-USDT | $0.541 0.0001687 Eth | $32,618,470.00 60,639,877.300 YGG | 18.8152% |
3 | Binance | YGG-USDT | $0.535 0.0001675 Eth | $22,514,589.00 41,750,775.100 YGG | 12.9544% |
4 | OKX | YGG-USDT | $0.5373 0.0001681 Eth | $9,769,603.00 18,102,046.494 YGG | 5.6167% |
5 | Nami.Exchange | YGG-VNST | $0.5391 0.0001684 Eth | $8,255,225.00 15,312,560.600 YGG | 4.7512% |
6 | Nami.Exchange | YGG-USDT | $0.5364 0.0001678 Eth | $8,141,817.00 15,178,948.600 YGG | 4.7097% |
7 | Bitunix | YGG-USDT | $0.5354 0.0001673 Eth | $7,172,575.00 13,393,351.800 YGG | 4.1557% |
8 | HTX | YGG-USDT | $0.5382 0.0001684 Eth | $5,950,791.00 11,131,701.037 YGG | 3.4539% |
9 | DigiFinex | YGG-USDT | $0.5377 0.0001682 Eth | $5,405,963.00 10,054,116.400 YGG | 3.1196% |
10 | Websea | YGG-USDT | $0.537 0.0001680 Eth | $3,458,488.00 0.000 YGG | 0.0000% |
11 | Hotcoin | YGG-USDT | $0.5381 0.0001683 Eth | $3,182,287.00 5,913,957.000 YGG | 1.8350% |
12 | Bitget | YGG-USDT | $0.5383 0.0001684 Eth | $2,554,569.00 4,751,223.099 YGG | 1.4742% |
13 | BTSE | YGG-USDT | $0.5375 0.0001682 Eth | $2,535,958.00 4,718,167.415 YGG | 1.4639% |
14 | Bibox | YGG-USDT | $0.532 0.0001665 Eth | $2,328,349.00 4,376,527.000 YGG | 1.3579% |
15 | Phemex | YGG-USDT | $0.5348 0.0001672 Eth | $2,112,551.00 3,950,359.560 YGG | 1.2257% |
16 | Ourbit | YGG-USDT | $0.5359 0.0001674 Eth | $2,084,531.00 3,866,809.520 YGG | 1.1998% |
17 | Bitrue | YGG-USDT | $0.5376 0.0001682 Eth | $1,909,994.00 3,552,777.140 YGG | 1.1023% |
18 | WhiteBIT | YGG-USDT | $0.5368 0.0001679 Eth | $1,732,672.00 3,227,853.919 YGG | 1.0015% |
19 | Biconomy.com | YGG-USDT | $0.5374 0.0001681 Eth | $1,242,564.00 2,316,221.700 YGG | 0.7187% |
20 | Koinpark | YGG-USDT | $0.5377 0.0001682 Eth | $1,209,895.00 2,250,331.873 YGG | 0.6982% |
21 | LBank | YGG-USDT | $0.5371 0.0001680 Eth | $1,080,814.00 2,012,328.120 YGG | 0.6244% |
22 | BYDFi | YGG-USDT | $0.5376 0.0001682 Eth | $891,504.00 1,658,453.800 YGG | 0.5146% |
23 | OrangeX | YGG-USDT | $0.5349 0.0001673 Eth | $783,600.00 1,450,564.100 YGG | 0.4501% |
24 | Bithumb | YGG-KRW | $0.5385 0.0001685 Eth | $775,844.00 1,440,845.968 YGG | 0.4471% |
25 | CoinCatch | YGG-USDT | $0.5338 0.0001671 Eth | $614,017.00 1,146,398.390 YGG | 0.3557% |
26 | KuCoin | YGG-USDT | $0.5381 0.0001684 Eth | $577,091.00 1,072,485.883 YGG | 0.3328% |
27 | Binance | YGG-USDC | $0.5363 0.0001676 Eth | $496,547.00 913,680.300 YGG | 0.2835% |
28 | Binance | YGG-BTC | $0.5346 0.0001674 Eth | $482,551.00 869,725.800 YGG | 0.2699% |
29 | Upbit | YGG-BTC | $0.5363 0.0001678 Eth | $481,526.00 897,942.690 YGG | 0.2786% |
30 | XT.COM | YGG-USDT | $0.5377 0.0001682 Eth | $457,234.00 848,036.000 YGG | 0.2631% |
31 | FameEX | YGG-USDT | $0.5377 0.0001682 Eth | $452,929.00 840,135.500 YGG | 0.2607% |
32 | Upbit Indonesia | YGG-BTC | $0.5363 0.0001678 Eth | $444,950.00 829,743.196 YGG | 0.2575% |
33 | Bitvavo | YGG-EUR | $0.5387 0.0001682 Eth | $408,829.00 758,958.847 YGG | 0.2355% |
34 | PointPay | YGG-USDT | $0.5379 0.0001683 Eth | $373,441.00 692,447.508 YGG | 0.2149% |
35 | CoinTR | YGG-USDT | $0.5373 0.0001681 Eth | $351,664.00 655,051.200 YGG | 0.2032% |
36 | BingX | YGG-USDT | $0.539 0.0001686 Eth | $341,051.00 633,086.125 YGG | 0.1964% |
37 | Koinpark | YGG-INR | $0.5446 0.0001704 Eth | $239,084.00 438,974.947 YGG | 0.1362% |
38 | Binance | YGG-TRY | $0.5356 0.0001677 Eth | $224,954.00 416,422.500 YGG | 0.1292% |
39 | CoinW | YGG-USDT | $0.5378 0.0001680 Eth | $182,765.00 339,839.641 YGG | 0.1054% |
40 | Toobit | YGG-USDT | $0.5375 0.0001682 Eth | $177,990.00 330,151.900 YGG | 0.1024% |
41 | Nominex | YGG-USDT | $0.5377 0.0001682 Eth | $168,878.00 314,072.905 YGG | 0.0974% |
42 | Pionex | YGG-USDT | $0.5366 0.0001679 Eth | $163,479.00 303,277.103 YGG | 0.0941% |
43 | DeGate | 0X25F8087EAD173B73D6E8B84329989A8EEA16CF73-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $0.5372 0.0001681 Eth | $127,577.00 237,752.560 0X25F8087EAD173B73D6E8B84329989A8EEA16CF73 | 0.0738% |
44 | LATOKEN | YGG-USDT | $0.5348 0.0001673 Eth | $126,582.00 236,709.621 YGG | 0.0734% |
45 | BitMart | YGG-USDT | $0.5362 0.0001678 Eth | $124,653.00 232,472.724 YGG | 0.0721% |
46 | Tapbit | YGG-USDT | $0.5345 0.0001673 Eth | $121,811.00 226,268.400 YGG | 0.0702% |
47 | MEXC | YGG-USDT | $0.5351 0.0001673 Eth | $112,386.00 210,032.960 YGG | 0.0652% |
48 | Sushiswap | 0X25F8087EAD173B73D6E8B84329989A8EEA16CF73-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $0.5374 0.0001681 Eth | $101,993.00 188,502.253 0X25F8087EAD173B73D6E8B84329989A8EEA16CF73 | 0.0585% |
49 | Katana | 0X1C306872BC82525D72BF3562E8F0AA3F8F26E857-0XE514D9DEB7966C8BE0CA922DE8A064264EA6BCD4 | $0.5364 0.0001678 Eth | $82,818.00 155,883.651 0X1C306872BC82525D72BF3562E8F0AA3F8F26E857 | 0.0484% |
50 | PointPay | YGG-USDC | $0.426 0.0001725 Eth | $78,725.00 193,388.966 YGG | 0.0600% |
51 | OKX | YGG-USDC | $0.5335 0.0001669 Eth | $76,729.00 141,775.444 YGG | 0.0440% |
52 | BloFin | YGG-USDT | $0.5379 0.0001683 Eth | $72,808.00 135,209.300 YGG | 0.0420% |
53 | WOO X | YGG-USDT | $0.5383 0.0001684 Eth | $42,132.00 78,269.900 YGG | 0.0243% |
54 | Kraken | YGG-USD | $0.542 0.0001696 Eth | $41,021.00 75,684.084 YGG | 0.0235% |
55 | Cryptology | YGG-USDT | $0.5338 0.0001671 Eth | $40,545.00 75,956.200 YGG | 0.0236% |
56 | Coins.ph | YGG-PHP | $0.5355 0.0001676 Eth | $38,289.00 71,232.920 YGG | 0.0221% |
57 | WEEX | YGG-USDT | $0.5412 0.0001688 Eth | $33,467.00 62,394.000 YGG | 0.0194% |
58 | CoinEx | YGG-USDT | $0.5354 0.0001675 Eth | $27,555.00 49,642.140 YGG | 0.0154% |
59 | Crypto.com Exchange | YGG-USD | $0.5365 0.0001678 Eth | $21,523.00 40,117.600 YGG | 0.0124% |
60 | Crypto.com Exchange | YGG-USDT | $0.5351 0.0001674 Eth | $18,159.95 33,937.800 YGG | 0.0105% |
61 | Kraken | YGG-EUR | $0.5372 0.0001681 Eth | $17,551.70 32,674.152 YGG | 0.0101% |
62 | OKX | YGG-EUR | $0.5292 0.0001655 Eth | $9,011.32 16,621.771 YGG | 0.0052% |
63 | TokoCrypto | YGG-USDT | $0.5377 0.0001682 Eth | $8,481.83 15,774.098 YGG | 0.0049% |
64 | Kanga | YGG-USDT | $0.5361 0.0001677 Eth | $7,272.72 0.000 YGG | 0.0000% |
65 | Mudrex | YGG-USDT | $0.5376 0.0001682 Eth | $6,960.44 12,947.301 YGG | 0.0040% |
66 | Nominex | YGG-TRY | $0.5365 0.0001676 Eth | $4,462.24 8,317.252 YGG | 0.0026% |
67 | Nominex | YGG-USDC | $0.536 0.0001675 Eth | $4,174.40 7,787.570 YGG | 0.0024% |
68 | Nominex | YGG-BTC | $0.538 0.0001683 Eth | $3,805.48 7,073.671 YGG | 0.0022% |
69 | Mercado Bitcoin | YGG-BRL | $0.5882 0.0001840 Eth | $3,234.24 5,498.898 YGG | 0.0017% |
70 | NovaDAX | YGG-BRL | $0.5219 0.0001633 Eth | $1,937.98 3,713.000 YGG | 0.0012% |
71 | Uniswap V3 (Polygon) | 0X82617AA52DDDF5ED9BB7B370ED777B3182A30FD1-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619 | $0.457 0.0001560 Eth | $1,694.48 6,823.136 0X82617AA52DDDF5ED9BB7B370ED777B3182A30FD1 | 0.0021% |
72 | Gate.io | YGG-USDC | $0.5367 0.0001679 Eth | $1,423.08 2,657.860 YGG | 0.0008% |
73 | Gate.io | YGG-TRY | $0.5293 0.0001656 Eth | $1,024.85 1,902.951 YGG | 0.0006% |
74 | Foxbit | YGG-BRL | $0.5656 0.0001769 Eth | $492.60 933.579 YGG | 0.0003% |
75 | Sushiswap | 0X557B933A7C2C45672B610F8954A3DEB39A51A8CA-0X25F8087EAD173B73D6E8B84329989A8EEA16CF73 | $0.5377 0.0001681 Eth | $401.61 98,167.552 0X557B933A7C2C45672B610F8954A3DEB39A51A8CA | 0.0305% |
76 | Gate.io | YGG-ETH | $0.5432 0.0001700 Eth | $319.88 592.317 YGG | 0.0002% |
77 | TokoCrypto | YGG-BTC | $0.462 0.0001587 Eth | $256.33 554.877 YGG | 0.0002% |
78 | Bittime | YGG-IDR | $0.5389 0.0001686 Eth | $126.85 234.800 YGG | 0.0001% |
79 | Korbit | YGG-KRW | $0.5283 0.0001653 Eth | $90.29 167.698 YGG | 0.0001% |
80 | Poloniex | YGG-USDT | $0.4952 0.0001549 Eth | $38.21 75.010 YGG | 0.0000% |
81 | Matcha (Polygon) | 0X82617AA52DDDF5ED9BB7B370ED777B3182A30FD1-0XC2132D05D31C914A87C6611C10748AEB04B58E8F | $0.3844 0.0001202 Eth | $20.01 52.053 0X82617AA52DDDF5ED9BB7B370ED777B3182A30FD1 | 0.0000% |
82 | ProBit Global | YGG-USDT | $0.4013 0.0001256 Eth | $17.47 43.539 YGG | 0.0000% |
83 | Giottus | YGG-INR | $0.5133 0.0001741 Eth | $1.067 2.079 YGG | 0.0000% |
84 | Sushiswap (Harmony) | 0X63CF309500D8BE0B9FDB8F1FB66C821236C0438C-0X6983D1E6DEF3690C4D616B13597A09E6193EA013 | $0.353 0.0001105 Eth | $0.9406 2.664 0X63CF309500D8BE0B9FDB8F1FB66C821236C0438C | 0.0000% |
85 | HitBTC | YGG-USDT | $0.5042 0.0002070 Eth | $0.0202 0.040 YGG | 0.0000% |
Contract Name:
YGGToken
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-07-26 */ // SPDX-License-Identifier: NONE pragma solidity 0.6.12; // Part: OpenZeppelin/[email protected]/Address /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } } // Part: OpenZeppelin/[email protected]/Context /* * @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 GSN 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 payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // Part: OpenZeppelin/[email protected]/IERC20 /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // Part: OpenZeppelin/[email protected]/SafeMath /** * @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) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold 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; } } // Part: OpenZeppelin/[email protected]/ERC20 /** * @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 guidelines: functions revert instead * of 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 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view 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 {_setupDecimals} is * called. * * 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 returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, 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}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), 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}; * * 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) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); 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) { _approve(_msgSender(), spender, _allowances[_msgSender()][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 {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) { _approve(_msgSender(), spender, _allowances[_msgSender()][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 virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, 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 * * - `to` 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 = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(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); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(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 Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @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 to 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 { } } // File: YGGToken.sol contract YGGToken is ERC20("Yield Guild Games Token", "YGG") { constructor() public { _mint(msg.sender, 1_000_000_000 ether); } }
Contract Security Audit
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[{"inputs":[],"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":"view","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":"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":"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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