ETH Price: $3,515.13 (+4.79%)

Token

Fetch (FET)
 

Overview

Max Total Supply

2,719,493,896.671999999999656122 FET

Holders

132,288 ( 0.002%)

Market

Price

$1.41 @ 0.000401 ETH (+8.29%)

Onchain Market Cap

$3,834,486,394.31

Circulating Supply Market Cap

$3,672,192,104.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
61.052824873603329272 FET

Value
$86.08 ( ~0.0244884031316856 Eth) [0.0000%]
0xe2e54270813c5c44a6f97d123120952a12b00000
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OVERVIEW

Fetch.ai is building tools and infrastructure to enable a decentralized digital economy by combining AI, multi-agent systems and advanced cryptography.

Market

Volume (24H):$700,781,677.00
Market Capitalization:$3,672,192,104.00
Circulating Supply:2,609,959,127.00 FET
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
FET-USDT$1.41
0.0004012 Eth
$142,177,403.00
114,027,421.600 FET
31.1344%
2
XT.COM
FET-USDT$1.42
0.0004021 Eth
$29,275,525.00
23,485,581.300 FET
6.4126%
3
Coinbase Exchange
FET-USD$1.41
0.0004023 Eth
$27,134,632.00
19,185,909.300 FET
5.2386%
4
Bitrue
FET-USDT$1.41
0.0004009 Eth
$26,307,484.00
18,706,291.300 FET
5.1076%
5
Bit2Me
FET-USDT$1.41
0.0004020 Eth
$22,286,760.00
17,513,519.820 FET
4.7819%
6
Gate.io
FET-USDT$1.41
0.0004014 Eth
$22,255,311.00
17,486,945.560 FET
4.7747%
7
Websea
FET-USDT$1.41
0.0004015 Eth
$18,977,419.00
0.000 FET
0.0000%
8
Bybit
FET-USDT$1.41
0.0004014 Eth
$17,772,654.00
14,139,991.620 FET
3.8608%
9
Bitget
FET-USDT$1.42
0.0004021 Eth
$16,849,807.00
13,337,402.000 FET
3.6417%
10
KuCoin
FET-USDT$1.41
0.0004014 Eth
$15,141,762.00
10,719,013.837 FET
2.9267%
11
LBank
FET-USDT$1.41
0.0004015 Eth
$14,866,335.00
10,518,422.000 FET
2.8720%
12
MEXC
FET-USDT$1.41
0.0004021 Eth
$13,301,716.00
9,413,376.800 FET
2.5703%
13
Bitunix
FET-USDT$1.41
0.0004020 Eth
$11,734,611.00
8,304,365.500 FET
2.2674%
14
OKX
FET-USDT$1.41
0.0004017 Eth
$9,752,951.00
7,679,782.816 FET
2.0969%
15
OrangeX
FET-USDT$1.41
0.0004018 Eth
$9,045,016.00
7,182,740.000 FET
1.9612%
16
Bitvavo
FET-EUR$1.41
0.0003996 Eth
$8,739,408.00
6,214,599.846 FET
1.6969%
17
Icrypex
FET-USDT$1.42
0.0004027 Eth
$8,420,660.00
5,948,661.800 FET
1.6242%
18
Ourbit
FET-USDT$1.41
0.0004024 Eth
$8,134,755.00
6,521,002.250 FET
1.7805%
19
BTSE
FET-USDT$1.41
0.0004015 Eth
$6,847,027.00
4,845,178.730 FET
1.3229%
20
DigiFinex
FET-USDT$1.41
0.0004014 Eth
$4,727,113.00
3,345,531.990 FET
0.9135%
21
Binance
FET-USDC$1.41
0.0004016 Eth
$4,723,231.00
3,772,823.000 FET
1.0301%
22
Binance
FET-BTC$1.41
0.0004012 Eth
$4,598,902.00
3,580,898.700 FET
0.9777%
23
Phemex
FET-USDT$1.41
0.0004020 Eth
$3,664,694.00
2,597,928.550 FET
0.7093%
24
Binance
FET-TRY$1.42
0.0004047 Eth
$3,522,224.00
2,782,806.400 FET
0.7598%
25
FameEX
FET-USDT$1.40
0.0003996 Eth
$2,902,206.00
2,325,619.500 FET
0.6350%
26
Hotcoin
FET-USDT$1.41
0.0004012 Eth
$2,630,566.00
1,869,171.200 FET
0.5104%
27
Kraken
FET-USD$1.41
0.0004016 Eth
$2,574,048.00
1,821,045.654 FET
0.4972%
28
Niza Global
FET-USD$1.41
0.0004001 Eth
$2,283,147.00
1,813,105.112 FET
0.4951%
29
WhiteBIT
FET-TRY$1.42
0.0004051 Eth
$2,237,834.00
1,574,176.900 FET
0.4298%
30
Crypto.com Exchange
FET-USD$1.42
0.0004038 Eth
$1,926,818.00
1,356,150.000 FET
0.3703%
31
BingX
FET-USDT$1.41
0.0004016 Eth
$1,853,401.00
1,473,024.451 FET
0.4022%
32
BYDFi
FET-USDT$1.40
0.0003997 Eth
$1,781,273.00
1,269,192.000 FET
0.3465%
33
Uniswap V3 (Ethereum)
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.41
0.0004005 Eth
$1,674,986.00
1,274,285.878 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.3479%
34
Slex
FET-USDT$1.42
0.0004028 Eth
$1,603,076.00
1,268,038.500 FET
0.3462%
35
Binance
FET-FDUSD$1.40
0.0003995 Eth
$1,572,535.00
1,248,263.200 FET
0.3408%
36
Bitrue
FET-XRP$1.41
0.0004023 Eth
$1,367,565.00
966,824.600 FET
0.2640%
37
Crypto.com Exchange
FET-USDT$1.42
0.0004038 Eth
$1,236,904.00
870,383.100 FET
0.2377%
38
Trubit
FET-USDT$1.41
0.0004009 Eth
$1,203,932.00
955,514.000 FET
0.2609%
39
AscendEX (BitMax)
FET-USDT$1.40
0.0003991 Eth
$1,175,672.00
837,034.000 FET
0.2285%
40
Toobit
FET-USDT$1.40
0.0003989 Eth
$1,154,153.00
926,051.000 FET
0.2529%
41
CoinEx
FET-USDT$1.42
0.0004028 Eth
$1,116,200.00
891,074.927 FET
0.2433%
42
LATOKEN
FET-USDT$1.41
0.0004015 Eth
$1,048,864.00
744,727.025 FET
0.2033%
43
Deepcoin
FET-USDT$1.41
0.0004023 Eth
$1,034,954.00
821,344.211 FET
0.2243%
44
Binance
FET-BNB$1.41
0.0004024 Eth
$1,018,171.00
758,944.800 FET
0.2072%
45
WhiteBIT
FET-BTC$1.41
0.0004017 Eth
$931,694.00
659,786.000 FET
0.1801%
46
Biconomy.com
FET-USDT$1.42
0.0004026 Eth
$813,092.00
625,806.000 FET
0.1709%
47
Coinbase Exchange
FET-USDT$1.41
0.0004019 Eth
$812,096.00
574,839.400 FET
0.1570%
48
Hibt
FET-USDT$1.40
0.0003992 Eth
$799,426.00
641,379.952 FET
0.1751%
49
PointPay
FET-USDT$1.41
0.0004022 Eth
$785,151.00
628,903.549 FET
0.1717%
50
Uniswap V3 (Ethereum)
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.41
0.0004017 Eth
$602,330.00
443,641.592 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.1211%
51
Kraken
FET-EUR$1.42
0.0004039 Eth
$584,344.00
411,075.276 FET
0.1122%
52
PointPay
FET-BTC$1.40
0.0003991 Eth
$501,783.00
391,531.674 FET
0.1069%
53
Gemini
FET-USD$1.41
0.0004015 Eth
$501,696.00
355,017.401 FET
0.0969%
54
Niza Global
FET-EUR$1.41
0.0004016 Eth
$488,715.00
392,755.811 FET
0.1072%
55
BitDelta
FET-USDT$1.41
0.0004022 Eth
$486,954.00
381,415.400 FET
0.1041%
56
Bitstamp
FET-EUR$1.41
0.0004016 Eth
$480,441.00
339,902.079 FET
0.0928%
57
CoinW
FET-USDT$1.42
0.0004026 Eth
$312,274.00
220,561.011 FET
0.0602%
58
Pionex
FET-USDT$1.42
0.0004027 Eth
$294,444.00
234,452.700 FET
0.0640%
59
Dex-Trade
FET-USDT$1.41
0.0004007 Eth
$292,482.00
208,050.300 FET
0.0568%
60
PancakeSwap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.41
0.0004013 Eth
$291,981.00
219,768.828 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0600%
61
Bitazza
FET-USDT$1.41
0.0004008 Eth
$281,111.00
215,387.600 FET
0.0588%
62
PointPay
FET-USDC$1.41
0.0003999 Eth
$259,898.00
207,746.165 FET
0.0567%
63
BVOX
FET-USDT$1.41
0.0004025 Eth
$236,647.00
182,888.140 FET
0.0499%
64
TokoCrypto
FET-USDT$1.41
0.0004025 Eth
$235,957.00
167,055.594 FET
0.0456%
65
Bybit
FET-USDC$1.41
0.0004014 Eth
$217,407.00
173,885.270 FET
0.0475%
66
HTX
FET-USDT$1.41
0.0004013 Eth
$212,008.00
164,446.263 FET
0.0449%
67
Mercado Bitcoin
FET-BRL$1.42
0.0004047 Eth
$187,863.00
131,872.395 FET
0.0360%
68
Bitfinex
FET-USD$1.41
0.0004016 Eth
$184,185.00
130,304.515 FET
0.0356%
69
Arkham
FET-USDT$1.41
0.0004007 Eth
$183,522.00
153,892.800 FET
0.0420%
70
Coinstore
FET-USDT$1.41
0.0004014 Eth
$182,517.00
144,755.000 FET
0.0395%
71
Binance US
FET-USDT$1.41
0.0004015 Eth
$168,572.00
119,286.750 FET
0.0326%
72
Uniswap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.41
0.0004009 Eth
$167,908.00
125,455.899 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0343%
73
Bitget
FET-BTC$1.41
0.0004017 Eth
$167,499.00
124,497.100 FET
0.0340%
74
bitcastle
FET-USDT$1.41
0.0004015 Eth
$166,221.00
133,788.000 FET
0.0365%
75
CEX.IO
FET-USD$1.41
0.0004018 Eth
$144,500.00
108,049.250 FET
0.0295%
76
Osmosis
IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-UOSMO$1.41
0.0004008 Eth
$113,238.00
80,273.705 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447
0.0219%
77
KuCoin
FET-BTC$1.41
0.0004019 Eth
$104,943.00
74,187.070 FET
0.0203%
78
BloFin
FET-USDT$1.41
0.0004012 Eth
$95,737.00
76,820.900 FET
0.0210%
79
Bitstamp
FET-USD$1.41
0.0004004 Eth
$93,985.00
66,676.537 FET
0.0182%
80
DeGate
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.41
0.0004019 Eth
$90,236.00
71,618.851 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.0196%
81
Tapbit
FET-USDT$1.41
0.0004003 Eth
$87,688.00
69,891.000 FET
0.0191%
82
Osmosis
IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-IBC/69110FF673D70B39904FF056CFDFD58A90BEC3194303F45C32CB91B8B0A738EA$1.41
0.0004005 Eth
$68,257.00
48,414.816 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447
0.0132%
83
Uniswap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.41
0.0004009 Eth
$67,149.00
50,297.231 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0137%
84
Bitfinex
FET-USDT$1.41
0.0004002 Eth
$64,236.00
45,593.826 FET
0.0124%
85
PancakeSwap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.41
0.0004009 Eth
$58,412.00
43,706.225 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0119%
86
Koinpark
FET-USDT$1.41
0.0004021 Eth
$51,424.00
39,395.902 FET
0.0108%
87
Bitlo
FET-TRY$1.42
0.0004033 Eth
$47,168.00
37,480.411 FET
0.0102%
88
CoinEx
FET-BTC$1.41
0.0004014 Eth
$35,662.00
27,153.962 FET
0.0074%
89
Osmosis
IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4-IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447$1.41
0.0004000 Eth
$31,124.00
31,119.851 IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4
0.0085%
90
WEEX
FET-USDT$1.41
0.0004006 Eth
$30,373.00
23,763.000 FET
0.0065%
91
KuCoin
FET-ETH$1.41
0.0004020 Eth
$27,721.00
19,591.722 FET
0.0053%
92
Uniswap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0X55D398326F99059FF775485246999027B3197955$1.41
0.0004009 Eth
$17,818.89
14,062.216 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0038%
93
PancakeSwap (v2)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.41
0.0004013 Eth
$15,758.74
9,127.973 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0025%
94
CoinEx
FET-USDC$1.41
0.0004009 Eth
$12,246.40
9,727.292 FET
0.0027%
95
OKX
FET-EUR$1.41
0.0004003 Eth
$8,785.47
6,726.770 FET
0.0018%
96
Uniswap V2 (Ethereum)
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.40
0.0003968 Eth
$6,181.79
4,833.124 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.0013%
97
TokoCrypto
FET-BTC$1.42
0.0004025 Eth
$4,525.31
3,197.940 FET
0.0009%
98
PancakeSwap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0X2170ED0880AC9A755FD29B2688956BD959F933F8$1.41
0.0004015 Eth
$2,410.12
1,796.434 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0005%
99
Osmosis
IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-IBC/D79E7D83AB399BFFF93433E54FAA480C191248FC556924A2A8351AE2638B3877$1.42
0.0004020 Eth
$1,620.26
1,144.996 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447
0.0003%
100
Nominex
FET-USDT$1.41
0.0004004 Eth
$5.26
3.742 FET
0.0000%

Contract Source Code Verified (Exact Match)

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

Contract ABI

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":"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"}]

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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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