ETH Price: $3,473.39 (+0.64%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

76,926,220,145.483487 USDT

Holders

6,577,111 ( -0.010%)

Market

Price

$1.00 @ 0.000288 ETH (+0.05%)

Onchain Market Cap

$76,914,373,507.58

Circulating Supply Market Cap

$140,633,003,499.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0xf9e72740a793e13ded23bffa5db183422ec847f1
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OVERVIEW

Tether gives you the joint benefits of open blockchain technology and traditional currency by converting your cash into a stable digital currency equivalent.

Market

Volume (24H):$116,026,783,711.00
Market Capitalization:$140,633,003,499.00
Circulating Supply:140,623,286,117.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.00
0.0002883 Eth
$5,603,669,550.00
58,542.098 BTC
0.0000%
2
Binance
ETH-USDT$0.9996
0.0002883 Eth
$4,270,397,511.00
1,288,315.043 ETH
0.0000%
3
BVOX
BTC-USDT$1.00
0.0002883 Eth
$4,189,586,709.00
43,760.031 BTC
0.0000%
4
FameEX
BTC-USDT$0.9995
0.0002883 Eth
$4,178,519,994.00
43,681.500 BTC
0.0000%
5
Pionex
BTC-USDT$0.9996
0.0002883 Eth
$3,790,641,631.00
39,527.468 BTC
0.0000%
6
Ourbit
BTC-USDT$0.9996
0.0002886 Eth
$3,416,402,494.00
35,699.528 BTC
0.0000%
7
Bybit
BTC-USDT$0.9997
0.0002883 Eth
$3,300,561,452.00
34,337.799 BTC
0.0000%
8
Toobit
BTC-USDT$0.9997
0.0002884 Eth
$2,876,110,649.00
30,016.875 BTC
0.0000%
9
FameEX
ETH-USDT$0.9996
0.0002887 Eth
$2,857,974,596.00
862,297.163 ETH
0.0000%
10
Tapbit
ETH-USDT$0.9992
0.0002879 Eth
$2,696,032,159.00
812,147.576 ETH
0.0000%
11
Toobit
ETH-USDT$0.9992
0.0002883 Eth
$2,676,336,625.00
807,245.185 ETH
0.0000%
12
WhiteBIT
BTC-USDT$0.9996
0.0002888 Eth
$2,370,868,454.00
24,361.310 BTC
0.0000%
13
Binance
XRP-USDT$1.00
0.0002887 Eth
$2,337,801,922.00
1,077,175,950.000 XRP
0.0013%
14
Binance
USDC-USDT$0.9997
0.0002883 Eth
$2,205,245,300.00
2,203,836,955.000 USDC
0.0027%
15
CoinW
BTC-USDT$0.9993
0.0002885 Eth
$2,188,064,811.00
22,523.591 BTC
0.0000%
16
Pionex
ETH-USDT$0.9996
0.0002884 Eth
$2,047,766,943.00
613,392.401 ETH
0.0000%
17
Binance
DOGE-USDT$0.9997
0.0002883 Eth
$2,041,220,806.00
6,854,374,558.000 DOGE
0.0085%
18
OKX
BTC-USDT$1.00
0.0002883 Eth
$1,972,655,760.00
20,608.524 BTC
0.0000%
19
Bitget
BTC-USDT$0.9997
0.0002883 Eth
$1,968,598,880.00
20,573.223 BTC
0.0000%
20
BitMart
ETH-USDT$0.9997
0.0002883 Eth
$1,945,711,863.00
561,630.667 ETH
0.0000%
21
BitMart
BTC-USDT$0.9997
0.0002883 Eth
$1,938,849,905.00
19,917.271 BTC
0.0000%
22
MEXC
ETH-USDT$0.999
0.0002883 Eth
$1,894,058,748.00
546,640.040 ETH
0.0000%
23
Bitget
ETH-USDT$0.9997
0.0002883 Eth
$1,834,384,825.00
554,770.102 ETH
0.0000%
24
BVOX
ETH-USDT$0.9999
0.0002887 Eth
$1,832,642,951.00
552,098.137 ETH
0.0000%
25
Binance
SOL-USDT$1.001
0.0002887 Eth
$1,800,739,086.00
9,637,972.909 SOL
0.0000%
26
OKX
ETH-USDT$0.9996
0.0002883 Eth
$1,746,766,304.00
529,406.011 ETH
0.0000%
27
Bybit
ETH-USDT$0.9997
0.0002883 Eth
$1,623,224,322.00
490,606.736 ETH
0.0000%
28
DigiFinex
BTC-USDT$1.00
0.0002883 Eth
$1,452,650,943.00
14,899.414 BTC
0.0000%
29
Ourbit
ETH-USDT$0.9992
0.0002883 Eth
$1,424,683,605.00
427,232.687 ETH
0.0000%
30
CoinW
ETH-USDT$0.9993
0.0002883 Eth
$1,229,183,044.00
354,490.683 ETH
0.0000%
31
Gate.io
BTC-USDT$1.00
0.0002883 Eth
$1,186,966,236.00
12,437.446 BTC
0.0000%
32
Bitunix
BTC-USDT$0.9997
0.0002884 Eth
$1,126,688,500.00
11,568.775 BTC
0.0000%
33
Hotcoin
BTC-USDT$0.9992
0.0002883 Eth
$1,121,724,842.00
11,532.892 BTC
0.0000%
34
OKX
DOGE-USDT$0.9996
0.0002883 Eth
$1,067,464,835.00
3,580,420,626.201 DOGE
0.0044%
35
XT.COM
BTC-USDT$0.9997
0.0002883 Eth
$1,066,766,924.00
11,145.666 BTC
0.0000%
36
LBank
BTC-USDT$0.9997
0.0002883 Eth
$1,066,005,285.00
10,943.593 BTC
0.0000%
37
Binance
USUAL-USDT$0.9997
0.0002883 Eth
$1,053,760,651.00
760,637,848.800 USUAL
0.0009%
38
AscendEX (BitMax)
BTC-USDT$1.00
0.0002883 Eth
$952,025,839.00
9,770.640 BTC
0.0000%
39
Binance
PEPE-USDT$1.001
0.0002887 Eth
$921,907,755.00
56,377,078,117,640.000 PEPE
69.9211%
40
P2B
BTC-USDT$0.9996
0.0002884 Eth
$906,694,109.00
9,329.151 BTC
0.0000%
41
HTX
BTC-USDT$1.00
0.0002883 Eth
$791,757,911.00
8,240.039 BTC
0.0000%
42
Binance
SUI-USDT$0.9997
0.0002885 Eth
$780,240,805.00
191,960,639.000 SUI
0.0002%
43
Bitunix
ETH-USDT$0.9997
0.0002884 Eth
$754,692,226.00
217,563.539 ETH
0.0000%
44
MEXC
DOGE-USDT$0.999
0.0002883 Eth
$731,044,996.00
2,262,566,359.570 DOGE
0.0028%
45
LATOKEN
BTC-USDT$0.9995
0.0002883 Eth
$695,587,148.00
7,146.569 BTC
0.0000%
46
DigiFinex
ETH-USDT$1.00
0.0002883 Eth
$661,349,298.00
190,231.097 ETH
0.0000%
47
BigONE
BTC-USDT$0.9997
0.0002883 Eth
$653,928,637.00
6,712.971 BTC
0.0000%
48
WEEX
BTC-USDT$0.9996
0.0002887 Eth
$635,357,459.00
6,642.404 BTC
0.0000%
49
Binance
BNB-USDT$0.9996
0.0002883 Eth
$623,503,465.00
954,155.094 BNB
0.0000%
50
LATOKEN
ETH-USDT$0.9997
0.0002884 Eth
$606,067,033.00
174,690.513 ETH
0.0000%
51
Tapbit
BTC-USDT$0.999
0.0002883 Eth
$601,367,111.00
6,287.616 BTC
0.0000%
52
Bybit
XRP-USDT$0.9997
0.0002883 Eth
$583,702,796.00
269,529,412.220 XRP
0.0003%
53
Bybit
SOL-USDT$0.9997
0.0002883 Eth
$582,254,909.00
3,133,438.991 SOL
0.0000%
54
Bitget
XRP-USDT$0.9997
0.0002883 Eth
$570,331,418.00
264,056,983.008 XRP
0.0003%
55
Bitget
DOGE-USDT$0.9997
0.0002883 Eth
$565,540,417.00
1,911,159,126.212 DOGE
0.0024%
56
FameEX
SOL-USDT$0.9995
0.0002883 Eth
$549,619,439.00
2,944,452.567 SOL
0.0000%
57
Binance
ADA-USDT$0.9995
0.0002885 Eth
$496,439,784.00
583,057,820.500 ADA
0.0007%
58
WhiteBIT
SOL-USDT$0.9997
0.0002883 Eth
$489,208,447.00
2,511,755.357 SOL
0.0000%
59
Gate.io
DOGE-USDT$1.00
0.0002883 Eth
$460,579,674.00
1,544,019,537.518 DOGE
0.0019%
60
Bybit
USDC-USDT$0.9997
0.0002883 Eth
$442,965,449.00
442,675,351.510 USDC
0.0005%
61
Bitget
BGB-USDT$0.9997
0.0002883 Eth
$429,592,618.00
106,974,123.729 BGB
0.0001%
62
Biconomy.com
BTC-USDT$0.9993
0.0002883 Eth
$422,146,494.00
4,402.214 BTC
0.0000%
63
Binance
ENA-USDT$0.9992
0.0002883 Eth
$411,285,581.00
405,990,213.870 ENA
0.0005%
64
FameEX
DOGE-USDT$0.9997
0.0002885 Eth
$411,164,222.00
1,380,166,102.016 DOGE
0.0017%
65
KuCoin
BTC-USDT$0.9997
0.0002884 Eth
$399,378,671.00
4,100.120 BTC
0.0000%
66
BTSE
BTC-USDT$1.00
0.0002883 Eth
$385,576,542.00
3,954.960 BTC
0.0000%
67
KuCoin
ETH-USDT$0.9997
0.0002884 Eth
$383,584,745.00
110,550.302 ETH
0.0000%
68
Binance
MOVE-USDT$0.9997
0.0002883 Eth
$376,333,488.00
428,900,730.100 MOVE
0.0005%
69
DigiFinex
DOGE-USDT$1.00
0.0002883 Eth
$375,402,288.00
1,156,180,317.680 DOGE
0.0014%
70
Binance
HBAR-USDT$0.9995
0.0002885 Eth
$370,401,733.00
1,415,507,877.000 HBAR
0.0018%
71
Coinstore
ETH-USDT$1.001
0.0002887 Eth
$363,974,575.00
108,567.738 ETH
0.0000%
72
OKX
SOL-USDT$0.9996
0.0002883 Eth
$357,182,709.00
1,919,542.324 SOL
0.0000%
73
WEEX
ETH-USDT$0.9996
0.0002886 Eth
$349,738,702.00
105,690.014 ETH
0.0000%
74
WhiteBIT
XRP-USDT$0.9996
0.0002883 Eth
$343,905,073.00
151,392,191.620 XRP
0.0002%
75
MEXC
SOL-USDT$0.9997
0.0002884 Eth
$336,726,825.00
1,730,060.260 SOL
0.0000%
76
OKX
XRP-USDT$0.9996
0.0002883 Eth
$323,193,416.00
149,443,614.442 XRP
0.0002%
77
Biconomy.com
ETH-USDT$0.9993
0.0002883 Eth
$301,433,618.00
90,525.992 ETH
0.0000%
78
WEEX
XRP-USDT$0.9992
0.0002883 Eth
$299,886,124.00
131,947,448.184 XRP
0.0002%
79
HTX
ETH-USDT$1.00
0.0002883 Eth
$285,869,601.00
85,537.611 ETH
0.0000%
80
WhiteBIT
SUI-USDT$1.001
0.0002887 Eth
$273,198,407.00
59,959,718.097 SUI
0.0001%
81
LBank
ETH-USDT$0.9995
0.0002882 Eth
$271,377,138.00
78,322.309 ETH
0.0000%
82
WhiteBIT
ZEN-USDT$1.00
0.0002883 Eth
$251,538,839.00
9,222,865.829 ZEN
0.0000%
83
MEXC
SUI-USDT$0.9996
0.0002885 Eth
$247,478,636.00
54,407,731.890 SUI
0.0001%
84
KuCoin
XRP-USDT$0.9997
0.0002884 Eth
$231,073,150.00
101,336,534.931 XRP
0.0001%
85
Bitunix
DOGE-USDT$0.9997
0.0002884 Eth
$229,468,305.00
708,457,431.000 DOGE
0.0009%
86
Hibt
BTC-USDT$0.9996
0.0002884 Eth
$227,257,202.00
2,374.956 BTC
0.0000%
87
Hibt
ETH-USDT$0.9995
0.0002883 Eth
$226,983,831.00
68,808.644 ETH
0.0000%
88
Gate.io
PEPE-USDT$0.9992
0.0002883 Eth
$226,363,188.00
13,963,985,228,222.200 PEPE
17.3187%
89
Bitget
SUI-USDT$0.9997
0.0002883 Eth
$225,073,452.00
55,216,955.400 SUI
0.0001%
90
Binance
PNUT-USDT$0.9997
0.0002883 Eth
$220,638,746.00
344,349,906.700 PNUT
0.0004%
91
Toobit
XRP-USDT$0.9992
0.0002883 Eth
$220,103,861.00
101,346,214.000 XRP
0.0001%
92
Coinstore
BTC-USDT$0.9993
0.0002883 Eth
$211,576,948.00
2,198.140 BTC
0.0000%
93
Azbit
XRP-USDT$0.9997
0.0002883 Eth
$205,634,704.00
95,441,840.240 XRP
0.0001%
94
Bitget
SOL-USDT$0.9997
0.0002883 Eth
$204,288,999.00
1,095,718.386 SOL
0.0000%
95
HTX
DOGE-USDT$1.00
0.0002883 Eth
$191,502,136.00
624,935,081.143 DOGE
0.0008%
96
WhiteBIT
PEPE-USDT$0.9995
0.0002882 Eth
$189,293,232.00
10,251,785,104,180.000 PEPE
12.7147%
97
Binance
PENGU-USDT$0.9997
0.0002883 Eth
$188,759,296.00
7,045,336,743.000 PENGU
0.0087%
98
Binance
FTM-USDT$0.9996
0.0002885 Eth
$176,656,854.00
190,043,420.000 FTM
0.0002%
99
BTSE
ETH-USDT$1.00
0.0002883 Eth
$171,132,027.00
49,246.789 ETH
0.0000%
100
KuCoin
SOL-USDT$0.9997
0.0002884 Eth
$157,516,962.00
808,891.126 SOL
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
TetherToken

Compiler Version
v0.4.18+commit.9cf6e910

Optimization Enabled:
No with 0 runs

Other Settings:
default evmVersion, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2017-11-28
*/

pragma solidity ^0.4.17;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;

    /**
      * @dev The Ownable constructor sets the original `owner` of the contract to the sender
      * account.
      */
    function Ownable() public {
        owner = msg.sender;
    }

    /**
      * @dev Throws if called by any account other than the owner.
      */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }

}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20Basic {
    uint public _totalSupply;
    function totalSupply() public constant returns (uint);
    function balanceOf(address who) public constant returns (uint);
    function transfer(address to, uint value) public;
    event Transfer(address indexed from, address indexed to, uint value);
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public constant returns (uint);
    function transferFrom(address from, address to, uint value) public;
    function approve(address spender, uint value) public;
    event Approval(address indexed owner, address indexed spender, uint value);
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is Ownable, ERC20Basic {
    using SafeMath for uint;

    mapping(address => uint) public balances;

    // additional variables for use if transaction fees ever became necessary
    uint public basisPointsRate = 0;
    uint public maximumFee = 0;

    /**
    * @dev Fix for the ERC20 short address attack.
    */
    modifier onlyPayloadSize(uint size) {
        require(!(msg.data.length < size + 4));
        _;
    }

    /**
    * @dev transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) {
        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        uint sendAmount = _value.sub(fee);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(msg.sender, owner, fee);
        }
        Transfer(msg.sender, _to, sendAmount);
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public constant returns (uint balance) {
        return balances[_owner];
    }

}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is BasicToken, ERC20 {

    mapping (address => mapping (address => uint)) public allowed;

    uint public constant MAX_UINT = 2**256 - 1;

    /**
    * @dev Transfer tokens from one address to another
    * @param _from address The address which you want to send tokens from
    * @param _to address The address which you want to transfer to
    * @param _value uint the amount of tokens to be transferred
    */
    function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) {
        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // if (_value > _allowance) throw;

        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        if (_allowance < MAX_UINT) {
            allowed[_from][msg.sender] = _allowance.sub(_value);
        }
        uint sendAmount = _value.sub(fee);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(_from, owner, fee);
        }
        Transfer(_from, _to, sendAmount);
    }

    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * @param _spender The address which will spend the funds.
    * @param _value The amount of tokens to be spent.
    */
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require(!((_value != 0) && (allowed[msg.sender][_spender] != 0)));

        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
    }

    /**
    * @dev Function to check the amount of tokens than an owner allowed to a spender.
    * @param _owner address The address which owns the funds.
    * @param _spender address The address which will spend the funds.
    * @return A uint specifying the amount of tokens still available for the spender.
    */
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        return allowed[_owner][_spender];
    }

}


/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

contract BlackList is Ownable, BasicToken {

    /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) ///////
    function getBlackListStatus(address _maker) external constant returns (bool) {
        return isBlackListed[_maker];
    }

    function getOwner() external constant returns (address) {
        return owner;
    }

    mapping (address => bool) public isBlackListed;
    
    function addBlackList (address _evilUser) public onlyOwner {
        isBlackListed[_evilUser] = true;
        AddedBlackList(_evilUser);
    }

    function removeBlackList (address _clearedUser) public onlyOwner {
        isBlackListed[_clearedUser] = false;
        RemovedBlackList(_clearedUser);
    }

    function destroyBlackFunds (address _blackListedUser) public onlyOwner {
        require(isBlackListed[_blackListedUser]);
        uint dirtyFunds = balanceOf(_blackListedUser);
        balances[_blackListedUser] = 0;
        _totalSupply -= dirtyFunds;
        DestroyedBlackFunds(_blackListedUser, dirtyFunds);
    }

    event DestroyedBlackFunds(address _blackListedUser, uint _balance);

    event AddedBlackList(address _user);

    event RemovedBlackList(address _user);

}

contract UpgradedStandardToken is StandardToken{
    // those methods are called by the legacy contract
    // and they must ensure msg.sender to be the contract address
    function transferByLegacy(address from, address to, uint value) public;
    function transferFromByLegacy(address sender, address from, address spender, uint value) public;
    function approveByLegacy(address from, address spender, uint value) public;
}

contract TetherToken is Pausable, StandardToken, BlackList {

    string public name;
    string public symbol;
    uint public decimals;
    address public upgradedAddress;
    bool public deprecated;

    //  The contract can be initialized with a number of tokens
    //  All the tokens are deposited to the owner address
    //
    // @param _balance Initial supply of the contract
    // @param _name Token Name
    // @param _symbol Token symbol
    // @param _decimals Token decimals
    function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public {
        _totalSupply = _initialSupply;
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        balances[owner] = _initialSupply;
        deprecated = false;
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transfer(address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[msg.sender]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value);
        } else {
            return super.transfer(_to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transferFrom(address _from, address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[_from]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value);
        } else {
            return super.transferFrom(_from, _to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function balanceOf(address who) public constant returns (uint) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).balanceOf(who);
        } else {
            return super.balanceOf(who);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value);
        } else {
            return super.approve(_spender, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        if (deprecated) {
            return StandardToken(upgradedAddress).allowance(_owner, _spender);
        } else {
            return super.allowance(_owner, _spender);
        }
    }

    // deprecate current contract in favour of a new one
    function deprecate(address _upgradedAddress) public onlyOwner {
        deprecated = true;
        upgradedAddress = _upgradedAddress;
        Deprecate(_upgradedAddress);
    }

    // deprecate current contract if favour of a new one
    function totalSupply() public constant returns (uint) {
        if (deprecated) {
            return StandardToken(upgradedAddress).totalSupply();
        } else {
            return _totalSupply;
        }
    }

    // Issue a new amount of tokens
    // these tokens are deposited into the owner address
    //
    // @param _amount Number of tokens to be issued
    function issue(uint amount) public onlyOwner {
        require(_totalSupply + amount > _totalSupply);
        require(balances[owner] + amount > balances[owner]);

        balances[owner] += amount;
        _totalSupply += amount;
        Issue(amount);
    }

    // Redeem tokens.
    // These tokens are withdrawn from the owner address
    // if the balance must be enough to cover the redeem
    // or the call will fail.
    // @param _amount Number of tokens to be issued
    function redeem(uint amount) public onlyOwner {
        require(_totalSupply >= amount);
        require(balances[owner] >= amount);

        _totalSupply -= amount;
        balances[owner] -= amount;
        Redeem(amount);
    }

    function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner {
        // Ensure transparency by hardcoding limit beyond which fees can never be added
        require(newBasisPoints < 20);
        require(newMaxFee < 50);

        basisPointsRate = newBasisPoints;
        maximumFee = newMaxFee.mul(10**decimals);

        Params(basisPointsRate, maximumFee);
    }

    // Called when new token are issued
    event Issue(uint amount);

    // Called when tokens are redeemed
    event Redeem(uint amount);

    // Called when contract is deprecated
    event Deprecate(address newAddress);

    // Called if contract ever adds fees
    event Params(uint feeBasisPoints, uint maxFee);
}

Contract Security Audit

Contract ABI

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onstant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_blackListedUser","type":"address"}],"name":"destroyBlackFunds","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_initialSupply","type":"uint256"},{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_decimals","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Issue","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newAddress","type":"address"}],"name":"Deprecate","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"feeBasisPoints","type":"uint256"},{"indexed":false,"name":"maxFee","type":"uint256"}],"name":"Params","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_blackListedUser","type":"address"},{"indexed":false,"name":"_balance","type":"uint256"}],"name":"DestroyedBlackFunds","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"AddedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"RemovedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000000000000000000000000000000000174876e800000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a546574686572205553440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _initialSupply (uint256): 100000000000
Arg [1] : _name (string): Tether USD
Arg [2] : _symbol (string): USDT
Arg [3] : _decimals (uint256): 6

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000174876e800
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 5465746865722055534400000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553445400000000000000000000000000000000000000000000000000000000


Swarm Source

bzzr://645ee12d73db47fd78ba77fa1f824c3c8f9184061b3b10386beb4dc9236abb28
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