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ERC-20
Artificial Intelligence
Overview
Max Total Supply
2,719,493,896.671999999999656122 FET
Holders
126,438 ( 0.179%)
Market
Price
$1.88 @ 0.000508 ETH (+14.13%)
Onchain Market Cap
$5,112,648,525.74
Circulating Supply Market Cap
$4,903,292,027.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
712.43864797 FETValue
$1,339.38 ( ~0.361825384966608 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Binance | FET-USDT | $1.87 0.0005063 Eth | $223,360,731.00 123,026,790.900 FET | 24.2245% |
2 | Gate.io | FET-USDT | $1.87 0.0005065 Eth | $67,666,447.00 36,976,341.160 FET | 7.2808% |
3 | Bit2Me | FET-USDT | $1.87 0.0005064 Eth | $67,578,427.00 36,938,778.840 FET | 7.2734% |
4 | WhiteBIT | FET-USDT | $1.88 0.0005080 Eth | $60,932,318.00 32,477,271.733 FET | 6.3949% |
5 | Coinbase Exchange | FET-USD | $1.87 0.0005062 Eth | $60,703,631.00 32,399,461.700 FET | 6.3796% |
6 | MEXC | FET-USDT | $1.87 0.0005056 Eth | $49,153,906.00 26,270,486.200 FET | 5.1728% |
7 | Bitrue | FET-USDT | $1.87 0.0005064 Eth | $32,272,559.00 17,220,577.200 FET | 3.3908% |
8 | Bitget | FET-USDT | $1.87 0.0005058 Eth | $30,567,164.00 16,811,711.000 FET | 3.3103% |
9 | Bitunix | FET-USDT | $1.87 0.0005064 Eth | $30,335,538.00 16,193,909.800 FET | 3.1887% |
10 | Websea | FET-USDT | $1.87 0.0005068 Eth | $29,982,310.00 0.000 FET | 0.0000% |
11 | Bybit | FET-USDT | $1.87 0.0005055 Eth | $27,015,762.00 14,922,762.410 FET | 2.9384% |
12 | OKX | FET-USDT | $1.88 0.0005068 Eth | $26,447,885.00 14,529,922.364 FET | 2.8610% |
13 | KuCoin | FET-USDT | $1.87 0.0005064 Eth | $24,476,305.00 13,060,489.521 FET | 2.5717% |
14 | XT.COM | FET-USDT | $1.88 0.0005079 Eth | $20,562,279.00 11,344,057.400 FET | 2.2337% |
15 | Hotcoin | FET-USDT | $1.87 0.0005057 Eth | $17,792,450.00 9,515,703.200 FET | 1.8737% |
16 | Binance | FET-TRY | $1.87 0.0005055 Eth | $15,332,055.00 8,394,926.400 FET | 1.6530% |
17 | LBank | FET-USDT | $1.87 0.0005066 Eth | $13,634,313.00 7,275,986.500 FET | 1.4327% |
18 | Bitvavo | FET-EUR | $1.88 0.0005079 Eth | $13,211,462.00 7,043,912.483 FET | 1.3870% |
19 | Icrypex | FET-USDT | $1.87 0.0005060 Eth | $12,527,881.00 6,689,708.500 FET | 1.3172% |
20 | BTSE | FET-USDT | $1.88 0.0005072 Eth | $11,490,398.00 6,123,737.359 FET | 1.2058% |
21 | Ourbit | FET-USDT | $1.88 0.0005078 Eth | $11,033,064.00 6,092,133.380 FET | 1.1996% |
22 | Binance | FET-BTC | $1.88 0.0005067 Eth | $8,758,725.00 4,792,042.000 FET | 0.9436% |
23 | Kraken | FET-USD | $1.87 0.0005060 Eth | $7,260,332.00 3,876,932.807 FET | 0.7634% |
24 | Uniswap V3 (Ethereum) | 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $1.88 0.0005084 Eth | $7,078,824.00 3,860,493.498 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85 | 0.7601% |
25 | Niza Global | FET-USD | $1.88 0.0005068 Eth | $7,060,967.00 3,879,575.330 FET | 0.7639% |
26 | DigiFinex | FET-USDT | $1.87 0.0005066 Eth | $7,055,902.00 3,763,206.718 FET | 0.7410% |
27 | Bithumb | FET-KRW | $1.86 0.0005027 Eth | $6,889,966.00 3,703,805.685 FET | 0.7293% |
28 | CoinEx | FET-USDT | $1.86 0.0005041 Eth | $6,564,426.00 3,652,046.259 FET | 0.7191% |
29 | CoinTR | FET-USDT | $1.88 0.0005082 Eth | $6,148,447.00 3,438,807.400 FET | 0.6771% |
30 | FameEX | FET-USDT | $1.88 0.0005082 Eth | $4,488,883.00 2,474,640.700 FET | 0.4873% |
31 | Phemex | FET-USDT | $1.88 0.0005079 Eth | $4,483,539.00 2,389,880.540 FET | 0.4706% |
32 | BingX | FET-USDT | $1.87 0.0005061 Eth | $3,567,959.00 1,968,480.516 FET | 0.3876% |
33 | OrangeX | FET-USDT | $1.87 0.0005051 Eth | $3,223,930.00 1,786,213.000 FET | 0.3517% |
34 | Slex | FET-USDT | $1.87 0.0005063 Eth | $3,115,050.00 1,714,929.800 FET | 0.3377% |
35 | WhiteBIT | FET-TRY | $1.88 0.0005079 Eth | $2,624,178.00 1,397,829.800 FET | 0.2752% |
36 | BYDFi | FET-USDT | $1.88 0.0005082 Eth | $2,534,782.00 1,350,616.000 FET | 0.2659% |
37 | Binance | FET-BNB | $1.87 0.0005061 Eth | $1,957,576.00 1,088,856.200 FET | 0.2144% |
38 | Kraken | FET-EUR | $1.87 0.0005058 Eth | $1,901,774.00 1,015,968.183 FET | 0.2000% |
39 | Toobit | FET-USDT | $1.87 0.0005066 Eth | $1,833,110.00 1,009,468.000 FET | 0.1988% |
40 | Niza Global | FET-EUR | $1.87 0.0005058 Eth | $1,823,845.00 1,015,968.183 FET | 0.2000% |
41 | Crypto.com Exchange | FET-USD | $1.87 0.0005062 Eth | $1,816,780.00 969,828.400 FET | 0.1910% |
42 | Biconomy.com | FET-USDT | $1.87 0.0005064 Eth | $1,815,954.00 1,004,477.000 FET | 0.1978% |
43 | Gemini | FET-USD | $1.87 0.0005046 Eth | $1,789,705.00 958,270.680 FET | 0.1887% |
44 | Crypto.com Exchange | FET-USDT | $1.87 0.0005065 Eth | $1,751,907.00 934,563.500 FET | 0.1840% |
45 | Deepcoin | FET-USDT | $1.87 0.0005064 Eth | $1,661,546.00 920,438.319 FET | 0.1812% |
46 | Coinbase Exchange | FET-USDT | $1.87 0.0005066 Eth | $1,305,119.00 696,222.500 FET | 0.1371% |
47 | AscendEX (BitMax) | FET-USDT | $1.87 0.0005062 Eth | $1,244,195.00 664,133.000 FET | 0.1308% |
48 | PointPay | FET-USDT | $1.88 0.0005085 Eth | $1,229,381.00 677,009.737 FET | 0.1333% |
49 | Binance | FET-FDUSD | $1.88 0.0005076 Eth | $1,159,165.00 638,202.700 FET | 0.1257% |
50 | Hibt | FET-USDT | $1.88 0.0005067 Eth | $1,062,068.00 584,983.789 FET | 0.1152% |
51 | PointPay | FET-BTC | $1.88 0.0005079 Eth | $967,454.00 528,476.645 FET | 0.1041% |
52 | Trubit | FET-USDT | $1.88 0.0005080 Eth | $924,421.00 518,456.000 FET | 0.1021% |
53 | KuCoin | FET-BTC | $1.87 0.0005065 Eth | $919,269.00 490,470.771 FET | 0.0966% |
54 | WhiteBIT | FET-BTC | $1.88 0.0005067 Eth | $913,273.00 487,019.000 FET | 0.0959% |
55 | PancakeSwap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $1.88 0.0005067 Eth | $871,441.00 481,546.375 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0948% |
56 | HTX | FET-USDT | $1.87 0.0005052 Eth | $831,701.00 462,150.154 FET | 0.0910% |
57 | Bitfinex | FET-USD | $1.87 0.0005058 Eth | $692,056.00 369,668.239 FET | 0.0728% |
58 | Pionex | FET-USDT | $1.87 0.0005062 Eth | $620,303.00 341,565.500 FET | 0.0673% |
59 | PointPay | FET-USDC | $1.88 0.0005071 Eth | $591,284.00 327,740.814 FET | 0.0645% |
60 | Uniswap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $1.88 0.0005086 Eth | $550,425.00 305,717.677 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0602% |
61 | BitDelta | FET-USDT | $1.87 0.0005058 Eth | $544,153.00 302,669.900 FET | 0.0596% |
62 | Dex-Trade | FET-USDT | $1.88 0.0005076 Eth | $532,568.00 284,019.000 FET | 0.0559% |
63 | Binance US | FET-USDT | $1.87 0.0005055 Eth | $485,837.00 259,782.794 FET | 0.0512% |
64 | TokoCrypto | FET-USDT | $1.87 0.0005065 Eth | $477,483.00 254,771.314 FET | 0.0502% |
65 | LATOKEN | FET-USDT | $1.87 0.0005062 Eth | $455,755.00 243,319.685 FET | 0.0479% |
66 | CoinW | FET-USDT | $1.88 0.0005077 Eth | $438,626.00 233,932.988 FET | 0.0461% |
67 | Bitstamp | FET-EUR | $1.88 0.0005071 Eth | $390,837.00 208,272.271 FET | 0.0410% |
68 | BVOX | FET-USDT | $1.87 0.0005060 Eth | $320,014.00 177,554.020 FET | 0.0350% |
69 | PancakeSwap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $1.88 0.0005067 Eth | $308,519.00 172,376.158 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0339% |
70 | Bitvavo | FET-USDC | $1.87 0.0005056 Eth | $299,612.00 160,243.024 FET | 0.0316% |
71 | Coinstore | FET-USDT | $1.88 0.0005075 Eth | $287,321.00 158,452.000 FET | 0.0312% |
72 | Uniswap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $1.87 0.0005057 Eth | $259,890.00 146,347.171 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0288% |
73 | Uniswap V3 (Ethereum) | 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $1.88 0.0005085 Eth | $233,019.00 126,753.085 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85 | 0.0250% |
74 | Bitfinex | FET-USDT | $1.88 0.0005070 Eth | $219,727.00 117,102.063 FET | 0.0231% |
75 | Bitlo | FET-TRY | $1.88 0.0005077 Eth | $196,927.00 109,262.292 FET | 0.0215% |
76 | Osmosis | IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-UOSMO | $1.88 0.0005079 Eth | $194,822.00 103,647.353 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447 | 0.0204% |
77 | Bitstamp | FET-USD | $1.87 0.0005053 Eth | $192,927.00 103,169.678 FET | 0.0203% |
78 | CEX.IO | FET-USD | $1.88 0.0005081 Eth | $189,174.00 101,714.155 FET | 0.0200% |
79 | Bitget | FET-BTC | $1.87 0.0005059 Eth | $184,226.00 98,464.500 FET | 0.0194% |
80 | Bybit | FET-USDC | $1.87 0.0005061 Eth | $178,536.00 97,426.770 FET | 0.0192% |
81 | WEEX | FET-USDT | $1.87 0.0005069 Eth | $146,592.00 81,677.000 FET | 0.0161% |
82 | KuCoin | FET-ETH | $1.87 0.0005053 Eth | $133,425.00 71,352.241 FET | 0.0140% |
83 | Tapbit | FET-USDT | $1.88 0.0005072 Eth | $131,426.00 72,316.000 FET | 0.0142% |
84 | CoinEx | FET-BTC | $1.88 0.0005075 Eth | $83,911.00 46,246.445 FET | 0.0091% |
85 | WEEX | FET-USDC | $1.87 0.0005067 Eth | $71,428.00 39,401.000 FET | 0.0078% |
86 | OKX | FET-EUR | $1.87 0.0005056 Eth | $68,278.00 37,806.945 FET | 0.0074% |
87 | Osmosis | IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-IBC/69110FF673D70B39904FF056CFDFD58A90BEC3194303F45C32CB91B8B0A738EA | $1.87 0.0005062 Eth | $60,593.00 32,343.350 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447 | 0.0064% |
88 | DeGate | 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $1.88 0.0005078 Eth | $51,428.00 28,403.791 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85 | 0.0056% |
89 | Osmosis | IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4-IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447 | $1.88 0.0005071 Eth | $48,691.00 48,685.941 IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4 | 0.0096% |
90 | Korbit | FET-KRW | $1.86 0.0005034 Eth | $41,069.00 23,129.277 FET | 0.0046% |
91 | CoinEx | FET-USDC | $1.89 0.0005100 Eth | $37,674.00 20,433.596 FET | 0.0040% |
92 | Uniswap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0X55D398326F99059FF775485246999027B3197955 | $1.87 0.0005061 Eth | $27,405.00 15,135.820 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0030% |
93 | Uniswap V3 (Ethereum) | 0X5B7533812759B45C2B44C19E320BA2CD2681B542-0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85 | $1.89 0.0005112 Eth | $15,686.33 19,283.836 0X5B7533812759B45C2B44C19E320BA2CD2681B542 | 0.0038% |
94 | Gate.io | FET-USDC | $1.88 0.0005075 Eth | $9,643.56 5,258.690 FET | 0.0010% |
95 | PancakeSwap (v2) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $1.89 0.0005098 Eth | $7,129.47 3,887.419 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0008% |
96 | PancakeSwap V3 (BSC) | 0X031B41E504677879370E9DBCF937283A8691FA7F-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $1.88 0.0005072 Eth | $4,495.50 2,459.774 0X031B41E504677879370E9DBCF937283A8691FA7F | 0.0005% |
97 | CEX.IO | FET-USDT | $1.87 0.0005067 Eth | $4,214.70 2,248.576 FET | 0.0004% |
98 | TokoCrypto | FET-BTC | $1.87 0.0005062 Eth | $2,316.98 1,236.850 FET | 0.0002% |
99 | Osmosis | IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-IBC/D79E7D83AB399BFFF93433E54FAA480C191248FC556924A2A8351AE2638B3877 | $1.89 0.0005095 Eth | $1,830.61 970.722 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447 | 0.0002% |
100 | Nominex | FET-USDT | $1.87 0.0005057 Eth | $35.16 18.809 FET | 0.0000% |
Contract Name:
FetchToken
Compiler Version
v0.6.2+commit.bacdbe57
Optimization Enabled:
Yes with 200 runs
Other Settings:
petersburg EvmVersion, Apache-2.0 license, Audited
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2020-10-05 */ // SPDX-License-Identifier: Apache-2.0 pragma solidity 0.6.2; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` * (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(value))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(value))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(value))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint256(_at(set._inner, index))); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } } /** * @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) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @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 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. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } 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; } } /** * @dev Contract module that allows children to implement role-based access * control mechanisms. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, _msgSender())); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. */ abstract contract AccessControl is Context { using EnumerableSet for EnumerableSet.AddressSet; using Address for address; struct RoleData { EnumerableSet.AddressSet members; bytes32 adminRole; } mapping (bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view returns (bool) { return _roles[role].members.contains(account); } /** * @dev Returns the number of accounts that have `role`. Can be used * together with {getRoleMember} to enumerate all bearers of a role. */ function getRoleMemberCount(bytes32 role) public view returns (uint256) { return _roles[role].members.length(); } /** * @dev Returns one of the accounts that have `role`. `index` must be a * value between 0 and {getRoleMemberCount}, non-inclusive. * * Role bearers are not sorted in any particular way, and their ordering may * change at any point. * * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure * you perform all queries on the same block. See the following * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] * for more information. */ function getRoleMember(bytes32 role, uint256 index) public view returns (address) { return _roles[role].members.at(index); } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) public virtual { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) public virtual { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) public virtual { require(account == _msgSender(), "AccessControl: can only renounce roles for self"); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { _roles[role].adminRole = adminRole; } function _grantRole(bytes32 role, address account) private { if (_roles[role].members.add(account)) { emit RoleGranted(role, account, _msgSender()); } } function _revokeRole(bytes32 role, address account) private { if (_roles[role].members.remove(account)) { emit RoleRevoked(role, account, _msgSender()); } } } /** * @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); } /** * @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; // 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; } } /** * @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 {ERC20MinterPauser}. * * 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 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 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 { } } /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor () internal { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!_paused, "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(_paused, "Pausable: not paused"); _; } /** * @dev Triggers stopped state. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } } /** * @dev ERC20 token with pausable token transfers, minting and burning. * * Useful for scenarios such as preventing trades until the end of an evaluation * period, or having an emergency switch for freezing all token transfers in the * event of a large bug. */ abstract contract ERC20Pausable is ERC20, Pausable { /** * @dev See {ERC20-_beforeTokenTransfer}. * * Requirements: * * - the contract must not be paused. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override { super._beforeTokenTransfer(from, to, amount); require(!paused(), "ERC20Pausable: token transfer while paused"); } } /** * @dev Extension of {ERC20} that allows token holders to destroy both their own * tokens and those that they have an allowance for, in a way that can be * recognized off-chain (via event analysis). */ abstract contract ERC20Burnable is Context, ERC20 { /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) external { _burn(_msgSender(), amount); } /** * @dev Destroys `amount` tokens from `account`, deducting from the caller's * allowance. * * See {ERC20-_burn} and {ERC20-allowance}. * * Requirements: * * - the caller must have allowance for ``accounts``'s tokens of at least * `amount`. */ function burnFrom(address account, uint256 amount) external { uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance"); _approve(account, _msgSender(), decreasedAllowance); _burn(account, amount); } } /** * @dev {ERC20} token, including: * * - ability for holders to burn (destroy) their tokens * - a minter role that allows for token minting (creation) * - a pauser role that allows to stop all token transfers * * This contract uses {AccessControl} to lock permissioned functions using the * different roles - head to its documentation for details. * * The account that deploys the contract will be granted the minter and pauser * roles, as well as the default admin role, which will let it grant both minter * and pauser roles to other accounts. */ contract FetchToken is Context, AccessControl, ERC20Burnable, ERC20Pausable { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE"); /** * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the * account that deploys the contract. * * See {ERC20-constructor}. */ modifier onlyMinter { require(hasRole(MINTER_ROLE, _msgSender()), "signer must have minter role to mint"); _; } modifier onlyPauser { require(hasRole(PAUSER_ROLE, _msgSender()), "signer must have pauser role to pause/unpause"); _; } constructor(string memory name, string memory symbol, uint256 _initialSupply) public ERC20(name, symbol) { _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); _setupRole(MINTER_ROLE, _msgSender()); _setupRole(PAUSER_ROLE, _msgSender()); _mint(_msgSender(), _initialSupply); } /** * @dev Creates `amount` new tokens for `to`. * * See {ERC20-_mint}. * * Requirements: * * - the caller must have the `MINTER_ROLE`. */ function mint(address to, uint256 amount) onlyMinter external { _mint(to, amount); } /** * @dev Pauses all token transfers. * * See {ERC20Pausable} and {Pausable-_pause}. * * Requirements: * * - the caller must have the `PAUSER_ROLE`. */ function pause() onlyPauser external { _pause(); } /** * @dev Unpauses all token transfers. * * See {ERC20Pausable} and {Pausable-_unpause}. * * Requirements: * * - the caller must have the `PAUSER_ROLE`. */ function unpause() onlyPauser external { _unpause(); } function _beforeTokenTransfer(address from, address to, uint256 amount) internal override(ERC20, ERC20Pausable) { super._beforeTokenTransfer(from, to, amount); } }
Contract Security Audit
- Certik - October 5th, 2020 - Security Audit Report
[{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint256","name":"_initialSupply","type":"uint256"}],"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":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","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"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINTER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PAUSER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"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":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","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":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getRoleMember","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleMemberCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","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":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","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":"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"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000003b9bcbbc8c64e757ebc00000000000000000000000000000000000000000000000000000000000000000005466574636800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034645540000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : name (string): Fetch
Arg [1] : symbol (string): FET
Arg [2] : _initialSupply (uint256): 1152997575000000000000000000
-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 000000000000000000000000000000000000000003b9bcbbc8c64e757ebc0000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [4] : 4665746368000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [6] : 4645540000000000000000000000000000000000000000000000000000000000
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://1233663b57e4236efc6106bf651fd85b90c4f971dff97478542d6043557014cb
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