ETH Price: $3,098.06 (+0.50%)

Token

Fetch (FET)
 

Overview

Max Total Supply

2,719,493,896.671999999999656122 FET

Holders

122,561 (0.00%)

Market

Price

$1.29 @ 0.000416 ETH (+4.40%)

Onchain Market Cap

$3,508,147,126.71

Circulating Supply Market Cap

$3,366,191,809.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
37,690.455132530665860629 FET

Value
$48,620.69 ( ~15.6939 Eth) [0.0014%]
0x960357a143096dc4395193f7d2df836e8c734b30
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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):$417,281,892.00
Market Capitalization:$3,366,191,809.00
Circulating Supply:2,609,959,127.00 FET
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
FET-USDT$1.29
0.0004162 Eth
$60,451,093.00
48,502,409.400 FET
21.0054%
2
Bit2Me
FET-USDT$1.28
0.0004141 Eth
$21,395,276.00
17,191,191.160 FET
7.4452%
3
Gate.io
FET-USDT$1.29
0.0004161 Eth
$21,314,783.00
17,127,347.700 FET
7.4175%
4
WhiteBIT
FET-USDT$1.29
0.0004156 Eth
$17,351,333.00
13,454,720.588 FET
5.8270%
5
Coinbase Exchange
FET-USD$1.29
0.0004160 Eth
$15,985,569.00
12,393,835.300 FET
5.3675%
6
MEXC
FET-USDT$1.29
0.0004160 Eth
$10,839,207.00
8,404,475.760 FET
3.6398%
7
Bitget
FET-USDT$1.29
0.0004168 Eth
$10,590,599.00
8,478,576.000 FET
3.6719%
8
KuCoin
FET-USDT$1.29
0.0004160 Eth
$10,535,532.00
8,168,057.705 FET
3.5374%
9
Bybit
FET-USDT$1.29
0.0004162 Eth
$10,016,205.00
8,046,026.220 FET
3.4846%
10
Bitrue
FET-USDT$1.29
0.0004163 Eth
$9,485,005.00
7,349,140.300 FET
3.1828%
11
Hotcoin
FET-USDT$1.29
0.0004152 Eth
$9,245,079.00
7,176,496.104 FET
3.1080%
12
Bitunix
FET-USDT$1.29
0.0004161 Eth
$9,006,277.00
6,978,094.000 FET
3.0221%
13
BTSE
FET-USDT$1.29
0.0004162 Eth
$7,211,258.00
5,583,723.754 FET
2.4182%
14
OKX
FET-USDT$1.29
0.0004157 Eth
$6,854,856.00
5,506,204.597 FET
2.3846%
15
CoinTR
FET-USDT$1.29
0.0004148 Eth
$6,648,937.00
5,326,212.600 FET
2.3067%
16
Bitvavo
FET-EUR$1.29
0.0004149 Eth
$5,173,473.00
4,021,577.671 FET
1.7417%
17
XT.COM
FET-USDT$1.29
0.0004164 Eth
$4,821,025.00
3,868,394.400 FET
1.6753%
18
Binance
FET-TRY$1.29
0.0004159 Eth
$3,726,475.00
2,967,497.300 FET
1.2852%
19
Icrypex
FET-USDT$1.29
0.0004163 Eth
$3,511,230.00
2,720,226.400 FET
1.1781%
20
Ourbit
FET-USDT$1.29
0.0004158 Eth
$3,011,966.00
2,415,656.790 FET
1.0462%
21
Phemex
FET-USDT$1.29
0.0004161 Eth
$2,783,060.00
2,157,426.390 FET
0.9343%
22
Kraken
FET-USD$1.29
0.0004167 Eth
$2,769,631.00
2,143,842.790 FET
0.9285%
23
Binance
FET-USDC$1.29
0.0004164 Eth
$2,749,982.00
2,199,584.400 FET
0.9526%
24
Niza Global
FET-USD$1.29
0.0004164 Eth
$2,665,979.00
2,138,310.383 FET
0.9261%
25
Binance
FET-BTC$1.29
0.0004160 Eth
$2,184,635.00
1,720,170.300 FET
0.7450%
26
DigiFinex
FET-USDT$1.29
0.0004161 Eth
$1,899,838.00
1,472,690.722 FET
0.6378%
27
LBank
FET-USDT$1.29
0.0004160 Eth
$1,860,433.00
1,441,507.600 FET
0.6243%
28
bitcastle
FET-USDT$1.29
0.0004153 Eth
$1,804,202.00
1,448,486.000 FET
0.6273%
29
OrangeX
FET-USDT$1.29
0.0004164 Eth
$1,742,853.00
1,396,540.000 FET
0.6048%
30
Trubit
FET-USDT$1.29
0.0004163 Eth
$1,346,793.00
1,077,052.000 FET
0.4664%
31
FameEX
FET-USDT$1.29
0.0004157 Eth
$1,238,193.00
993,668.400 FET
0.4303%
32
BingX
FET-USDT$1.29
0.0004156 Eth
$1,222,862.00
978,989.818 FET
0.4240%
33
Crypto.com Exchange
FET-USDT$1.29
0.0004163 Eth
$1,203,102.00
932,248.800 FET
0.4037%
34
CoinEx
FET-USDT$1.29
0.0004167 Eth
$1,169,516.00
933,484.465 FET
0.4043%
35
AscendEX (BitMax)
FET-USDT$1.28
0.0004130 Eth
$1,107,527.00
864,832.000 FET
0.3745%
36
Uniswap V3 (Ethereum)
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.28
0.0004136 Eth
$1,105,354.00
879,594.319 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.3809%
37
LATOKEN
FET-USDT$1.29
0.0004164 Eth
$1,078,938.00
835,397.692 FET
0.3618%
38
Crypto.com Exchange
FET-USD$1.29
0.0004172 Eth
$959,653.00
741,961.500 FET
0.3213%
39
CoinCatch
FET-USDT$1.29
0.0004166 Eth
$945,311.00
755,640.000 FET
0.3273%
40
Biconomy.com
FET-USDT$1.29
0.0004167 Eth
$905,274.00
724,989.000 FET
0.3140%
41
WhiteBIT
FET-TRY$1.30
0.0004182 Eth
$841,340.00
648,950.000 FET
0.2810%
42
Slex
FET-USDT$1.29
0.0004166 Eth
$808,949.00
648,998.500 FET
0.2811%
43
AscendEX (BitMax)
FET-BTC$1.28
0.0004140 Eth
$767,754.00
598,031.000 FET
0.2590%
44
Deepcoin
FET-USDT$1.29
0.0004161 Eth
$681,860.00
561,417.615 FET
0.2431%
45
BYDFi
FET-USDT$1.29
0.0004150 Eth
$665,100.00
516,148.000 FET
0.2235%
46
CoinW
FET-USDT$1.29
0.0004163 Eth
$508,656.00
393,943.316 FET
0.1706%
47
Binance
FET-FDUSD$1.29
0.0004172 Eth
$493,189.00
394,829.200 FET
0.1710%
48
Toobit
FET-USDT$1.29
0.0004171 Eth
$484,640.00
388,840.000 FET
0.1684%
49
HTX
FET-USDT$1.29
0.0004159 Eth
$442,120.00
352,567.214 FET
0.1527%
50
Coinbase Exchange
FET-USDT$1.29
0.0004168 Eth
$418,561.00
323,919.700 FET
0.1403%
51
Kraken
FET-EUR$1.29
0.0004156 Eth
$411,809.00
319,541.633 FET
0.1384%
52
Niza Global
FET-EUR$1.29
0.0004143 Eth
$399,231.00
320,949.079 FET
0.1390%
53
PointPay
FET-USDT$1.29
0.0004162 Eth
$336,310.00
269,876.105 FET
0.1169%
54
BitDelta
FET-USDT$1.29
0.0004145 Eth
$325,448.00
261,629.500 FET
0.1133%
55
Binance
FET-BNB$1.29
0.0004161 Eth
$303,050.00
241,039.500 FET
0.1044%
56
Gemini
FET-USD$1.29
0.0004156 Eth
$302,605.00
234,850.841 FET
0.1017%
57
Bitstamp
FET-EUR$1.29
0.0004156 Eth
$275,732.00
213,963.649 FET
0.0927%
58
Bitget
FET-BTC$1.29
0.0004157 Eth
$246,480.00
186,355.300 FET
0.0807%
59
PointPay
FET-BTC$1.29
0.0004164 Eth
$243,688.00
191,796.410 FET
0.0831%
60
Dex-Trade
FET-USDT$1.29
0.0004164 Eth
$214,535.00
166,153.300 FET
0.0720%
61
TokoCrypto
FET-USDT$1.29
0.0004160 Eth
$207,753.00
161,086.743 FET
0.0698%
62
PancakeSwap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.28
0.0004124 Eth
$193,288.00
155,418.389 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0673%
63
KuCoin
FET-ETH$1.28
0.0004144 Eth
$179,923.00
140,031.070 FET
0.0606%
64
Bitstamp
FET-USD$1.29
0.0004153 Eth
$173,242.00
134,558.876 FET
0.0583%
65
Uniswap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.30
0.0004192 Eth
$168,771.00
133,525.734 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0578%
66
BVOX
FET-USDT$1.29
0.0004150 Eth
$156,468.00
125,601.010 FET
0.0544%
67
Coinstore
FET-USDT$1.29
0.0004174 Eth
$154,399.00
123,758.000 FET
0.0536%
68
PointPay
FET-USDC$1.29
0.0004156 Eth
$153,073.00
122,419.761 FET
0.0530%
69
Pionex
FET-USDT$1.29
0.0004164 Eth
$144,855.00
116,425.900 FET
0.0504%
70
LCX Exchange
FET-EUR$1.28
0.0004129 Eth
$130,736.00
102,087.345 FET
0.0442%
71
KuCoin
FET-BTC$1.28
0.0004132 Eth
$123,357.00
96,292.527 FET
0.0417%
72
Bitfinex
FET-USD$1.28
0.0004136 Eth
$107,992.00
84,204.411 FET
0.0365%
73
WEEX
FET-USDT$1.29
0.0004163 Eth
$105,993.00
84,800.000 FET
0.0367%
74
BloFin
FET-USDT$1.29
0.0004163 Eth
$88,940.00
70,365.300 FET
0.0305%
75
Binance US
FET-USDT$1.29
0.0004159 Eth
$75,085.00
58,182.964 FET
0.0252%
76
Bitcointry
FET-USDT$1.29
0.0004153 Eth
$64,596.00
51,531.830 FET
0.0223%
77
WhiteBIT
FET-BTC$1.29
0.0004157 Eth
$61,625.00
47,762.000 FET
0.0207%
78
CoinEx
FET-BTC$1.29
0.0004167 Eth
$41,231.00
32,285.731 FET
0.0140%
79
Osmosis
IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4-IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447$1.29
0.0004148 Eth
$39,662.00
39,673.445 IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4
0.0172%
80
Osmosis
IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-UOSMO$1.29
0.0004157 Eth
$38,881.00
30,168.510 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447
0.0131%
81
Mercado Bitcoin
FET-BRL$1.30
0.0004184 Eth
$38,433.00
29,626.922 FET
0.0128%
82
Bitfinex
FET-USDT$1.29
0.0004168 Eth
$37,812.00
29,260.759 FET
0.0127%
83
Tapbit
FET-USDT$1.29
0.0004164 Eth
$33,094.00
26,557.000 FET
0.0115%
84
Bitlo
FET-TRY$1.30
0.0004178 Eth
$29,998.00
23,856.393 FET
0.0103%
85
DeGate
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$1.29
0.0004170 Eth
$29,573.00
23,775.132 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.0103%
86
CEX.IO
FET-USD$1.29
0.0004165 Eth
$29,554.00
23,065.620 FET
0.0100%
87
CoinEx
FET-USDC$1.29
0.0004168 Eth
$27,743.00
22,291.364 FET
0.0097%
88
Binance
FET-BRL$1.30
0.0004186 Eth
$27,372.00
21,790.300 FET
0.0094%
89
Kanga
FET-USDT$1.29
0.0004156 Eth
$17,855.41
0.000 FET
0.0000%
90
Osmosis
IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447-IBC/69110FF673D70B39904FF056CFDFD58A90BEC3194303F45C32CB91B8B0A738EA$1.29
0.0004151 Eth
$14,803.86
11,501.949 IBC/5D1F516200EE8C6B2354102143B78A2DEDA25EDE771AC0F8DC3C1837C8FD4447
0.0050%
91
Nominex
FET-USDT$1.29
0.0004155 Eth
$12,560.53
9,741.255 FET
0.0042%
92
Uniswap V3 (BSC)
0X031B41E504677879370E9DBCF937283A8691FA7F-0X55D398326F99059FF775485246999027B3197955$1.30
0.0004184 Eth
$11,179.31
8,996.535 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0039%
93
PancakeSwap (v2)
0X031B41E504677879370E9DBCF937283A8691FA7F-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$1.29
0.0004143 Eth
$7,706.72
5,638.707 0X031B41E504677879370E9DBCF937283A8691FA7F
0.0024%
94
Uniswap V2 (Ethereum)
0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.29
0.0004168 Eth
$4,275.80
3,429.906 0XAEA46A60368A7BD060EEC7DF8CBA43B7EF41AD85
0.0015%
95
TokoCrypto
FET-BTC$1.29
0.0004155 Eth
$2,949.36
2,285.940 FET
0.0010%
96
CEX.IO
FET-USDT$1.29
0.0004155 Eth
$1,523.76
1,190.177 FET
0.0005%
97
Nominex
FET-USDC$1.29
0.0004143 Eth
$1,216.59
944.759 FET
0.0004%
98
Nominex
FET-TRY$1.29
0.0004163 Eth
$98.39
76.152 FET
0.0000%
99
Nominex
FET-BTC$1.29
0.0004150 Eth
$67.21
52.189 FET
0.0000%
100
CEX.IO
FET-USDC$1.29
0.0004174 Eth
$34.86
27.898 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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