ETH Price: $3,516.73 (+4.83%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

76,926,220,145.483487 USDT

Holders

6,573,390 ( -0.067%)

Market

Price

$1.00 @ 0.000285 ETH (+0.31%)

Onchain Market Cap

$77,080,072,585.77

Circulating Supply Market Cap

$139,977,018,390.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0xcf15577d510e5719144d075dfffdce9ebb48274b
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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):$202,656,675,179.00
Market Capitalization:$139,977,018,390.00
Circulating Supply:139,872,815,647.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$0.9995
0.0002846 Eth
$5,345,710,067.00
55,916.326 BTC
0.0002%
2
BVOX
BTC-USDT$0.9994
0.0002846 Eth
$3,999,359,079.00
41,828.175 BTC
0.0001%
3
FameEX
BTC-USDT$0.9994
0.0002849 Eth
$3,991,042,761.00
41,754.482 BTC
0.0001%
4
Ourbit
BTC-USDT$0.9996
0.0002850 Eth
$3,206,469,785.00
33,536.813 BTC
0.0001%
5
Bybit
BTC-USDT$0.9994
0.0002846 Eth
$3,092,816,625.00
32,207.494 BTC
0.0001%
6
Toobit
BTC-USDT$0.9994
0.0002848 Eth
$2,733,646,231.00
28,557.161 BTC
0.0001%
7
Tapbit
ETH-USDT$0.9995
0.0002848 Eth
$2,605,700,423.00
784,666.028 ETH
0.0024%
8
Toobit
ETH-USDT$0.9994
0.0002849 Eth
$2,554,013,575.00
770,650.730 ETH
0.0024%
9
WhiteBIT
BTC-USDT$0.9997
0.0002847 Eth
$2,251,004,813.00
22,909.607 BTC
0.0001%
10
Binance
DOGE-USDT$0.9998
0.0002866 Eth
$2,037,119,930.00
6,835,946,493.000 DOGE
21.0546%
11
Pionex
ETH-USDT$0.9997
0.0002847 Eth
$1,937,207,926.00
580,325.165 ETH
0.0018%
12
OKX
BTC-USDT$0.9995
0.0002846 Eth
$1,903,958,143.00
19,908.879 BTC
0.0001%
13
Bitget
BTC-USDT$0.9994
0.0002846 Eth
$1,870,456,420.00
19,568.585 BTC
0.0001%
14
Binance
SOL-USDT$0.9995
0.0002868 Eth
$1,749,322,075.00
9,390,635.025 SOL
0.0289%
15
Bitget
ETH-USDT$0.9994
0.0002846 Eth
$1,747,552,095.00
529,217.517 ETH
0.0016%
16
MEXC
BTC-USDT$0.9994
0.0002846 Eth
$1,702,715,827.00
17,311.375 BTC
0.0001%
17
OKX
ETH-USDT$0.9994
0.0002846 Eth
$1,672,943,780.00
507,592.616 ETH
0.0016%
18
Bybit
ETH-USDT$0.9994
0.0002846 Eth
$1,539,684,629.00
465,917.101 ETH
0.0014%
19
DigiFinex
BTC-USDT$0.9995
0.0002846 Eth
$1,405,888,620.00
14,307.291 BTC
0.0000%
20
Gate.io
ETH-USDT$0.9994
0.0002846 Eth
$1,330,656,595.00
404,370.429 ETH
0.0012%
21
Gate.io
BTC-USDT$0.9994
0.0002846 Eth
$1,161,338,095.00
12,181.528 BTC
0.0000%
22
Bitunix
BTC-USDT$0.9997
0.0002849 Eth
$1,086,699,613.00
11,065.629 BTC
0.0000%
23
Hotcoin
BTC-USDT$0.9995
0.0002848 Eth
$1,074,210,164.00
10,932.957 BTC
0.0000%
24
OKX
DOGE-USDT$0.9994
0.0002846 Eth
$1,044,423,383.00
3,506,386,928.037 DOGE
10.7996%
25
LBank
BTC-USDT$0.9995
0.0002848 Eth
$1,025,976,019.00
10,445.397 BTC
0.0000%
26
XT.COM
BTC-USDT$0.9994
0.0002846 Eth
$997,082,038.00
10,429.568 BTC
0.0000%
27
Coinbase Exchange
USDT-USD$0.9993
0.0002846 Eth
$980,956,905.00
981,634,233.110 USDT
3.0234%
28
AscendEX (BitMax)
BTC-USDT$0.9994
0.0002846 Eth
$957,395,379.00
9,739.013 BTC
0.0000%
29
WhiteBIT
ETH-USDT$0.9994
0.0002849 Eth
$885,929,281.00
252,080.561 ETH
0.0008%
30
Binance
FDUSD-USDT$0.9995
0.0002873 Eth
$844,472,483.00
846,507,536.000 FDUSD
2.6072%
31
P2B
BTC-USDT$0.9995
0.0002848 Eth
$830,346,925.00
8,453.541 BTC
0.0000%
32
Binance
SUI-USDT$0.9995
0.0002862 Eth
$798,033,839.00
194,430,334.600 SUI
0.5988%
33
HTX
BTC-USDT$0.9994
0.0002846 Eth
$763,337,407.00
7,952.483 BTC
0.0000%
34
MEXC
DOGE-USDT$0.9994
0.0002846 Eth
$748,054,668.00
2,214,241,932.970 DOGE
6.8198%
35
Bitunix
ETH-USDT$0.9997
0.0002847 Eth
$732,628,743.00
208,486.858 ETH
0.0006%
36
LATOKEN
BTC-USDT$0.9996
0.0002850 Eth
$651,133,708.00
6,628.510 BTC
0.0000%
37
DigiFinex
ETH-USDT$0.9995
0.0002846 Eth
$639,160,449.00
181,828.341 ETH
0.0006%
38
Bybit
XRP-USDT$0.9994
0.0002846 Eth
$585,962,779.00
270,718,021.090 XRP
0.8338%
39
Tapbit
BTC-USDT$0.9997
0.0002847 Eth
$583,652,332.00
6,100.056 BTC
0.0000%
40
LATOKEN
ETH-USDT$0.9994
0.0002848 Eth
$574,425,989.00
163,499.496 ETH
0.0005%
41
Bitget
DOGE-USDT$0.9994
0.0002846 Eth
$569,900,922.00
1,923,566,889.376 DOGE
5.9245%
42
Bitget
XRP-USDT$0.9994
0.0002846 Eth
$566,810,342.00
262,754,138.550 XRP
0.8093%
43
Bybit
SOL-USDT$0.9994
0.0002846 Eth
$553,015,970.00
2,986,339.759 SOL
0.0092%
44
AscendEX (BitMax)
ETH-USDT$0.9994
0.0002846 Eth
$535,624,710.00
152,273.455 ETH
0.0005%
45
FameEX
SOL-USDT$1.00
0.0002851 Eth
$535,328,750.00
2,871,273.512 SOL
0.0088%
46
Binance
ADA-USDT$0.9997
0.0002873 Eth
$493,049,873.00
578,113,132.000 ADA
1.7806%
47
WhiteBIT
SOL-USDT$0.9994
0.0002849 Eth
$480,974,675.00
2,427,734.681 SOL
0.0075%
48
Azbit
BTC-USDT$0.9995
0.0002847 Eth
$459,026,970.00
4,813.742 BTC
0.0000%
49
Gate.io
DOGE-USDT$0.9994
0.0002846 Eth
$451,096,844.00
1,514,582,698.900 DOGE
4.6649%
50
Binance
ENA-USDT$0.9994
0.0002848 Eth
$410,362,976.00
401,219,300.800 ENA
1.2357%
51
FameEX
DOGE-USDT$0.9994
0.0002849 Eth
$409,552,462.00
1,373,954,738.626 DOGE
4.2318%
52
Bitget
BGB-USDT$0.9994
0.0002846 Eth
$409,209,963.00
102,078,359.554 BGB
0.3144%
53
Gate.io
XRP-USDT$0.9994
0.0002846 Eth
$396,512,342.00
183,182,409.866 XRP
0.5642%
54
KuCoin
BTC-USDT$0.9994
0.0002846 Eth
$392,721,576.00
3,995.066 BTC
0.0000%
55
Bybit
DOGE-USDT$0.9994
0.0002846 Eth
$389,078,800.00
1,317,083,369.400 DOGE
4.0566%
56
WhiteBIT
DOGE-USDT$0.9994
0.0002846 Eth
$388,390,521.00
1,149,268,833.600 DOGE
3.5397%
57
DigiFinex
DOGE-USDT$0.9995
0.0002846 Eth
$381,985,195.00
1,132,414,063.450 DOGE
3.4878%
58
KuCoin
ETH-USDT$0.9994
0.0002846 Eth
$374,026,347.00
106,402.886 ETH
0.0003%
59
BTSE
BTC-USDT$0.9994
0.0002848 Eth
$362,408,973.00
3,689.257 BTC
0.0000%
60
Binance
HBAR-USDT$0.9997
0.0002873 Eth
$354,150,638.00
1,360,642,278.000 HBAR
4.1908%
61
OKX
SOL-USDT$0.9994
0.0002846 Eth
$346,056,946.00
1,863,974.125 SOL
0.0057%
62
MEXC
SOL-USDT$0.9994
0.0002846 Eth
$338,018,351.00
1,703,459.810 SOL
0.0052%
63
OKX
XRP-USDT$0.9994
0.0002846 Eth
$323,281,201.00
149,602,577.026 XRP
0.4608%
64
Deepcoin
SOL-USDT$0.9994
0.0002849 Eth
$309,866,203.00
1,667,170.567 SOL
0.0051%
65
WhiteBIT
ZEN-USDT$0.9994
0.0002846 Eth
$283,650,473.00
10,207,092.479 ZEN
0.0314%
66
Kraken
USDT-USD$0.9993
0.0002846 Eth
$283,085,988.00
283,272,947.863 USDT
0.8725%
67
HTX
ETH-USDT$0.9994
0.0002846 Eth
$268,854,173.00
80,580.475 ETH
0.0002%
68
Coinbase Exchange
USDT-USDC$0.9995
0.0002848 Eth
$240,222,135.00
240,338,538.280 USDT
0.7402%
69
Bitunix
DOGE-USDT$0.9997
0.0002847 Eth
$236,714,446.00
702,623,818.000 DOGE
2.1641%
70
KuCoin
XRP-USDT$0.9994
0.0002846 Eth
$234,043,118.00
99,942,507.762 XRP
0.3078%
71
Binance
UNI-USDT$0.9997
0.0002847 Eth
$233,801,894.00
18,722,928.830 UNI
0.0577%
72
Bitget
SUI-USDT$0.9994
0.0002846 Eth
$232,467,834.00
56,509,052.970 SUI
0.1740%
73
Binance
PNUT-USDT$0.9995
0.0002846 Eth
$216,163,251.00
337,668,945.300 PNUT
1.0400%
74
Toobit
XRP-USDT$0.9994
0.0002849 Eth
$215,972,327.00
99,591,339.000 XRP
0.3067%
75
Bybit
MNT-USDT$0.9994
0.0002846 Eth
$215,958,201.00
185,574,181.580 MNT
0.5716%
76
Hibt
BTC-USDT$0.9996
0.0002850 Eth
$214,262,940.00
2,240.972 BTC
0.0000%
77
Azbit
XRP-USDT$0.9994
0.0002846 Eth
$212,577,888.00
98,502,783.360 XRP
0.3034%
78
OKX
SUI-USDT$0.9994
0.0002846 Eth
$210,716,242.00
51,161,357.709 SUI
0.1576%
79
Bitget
SOL-USDT$0.9994
0.0002846 Eth
$200,901,237.00
1,079,250.729 SOL
0.0033%
80
Gate.io
SOL-USDT$0.9994
0.0002846 Eth
$198,316,148.00
1,072,465.732 SOL
0.0033%
81
Bitunix
XRP-USDT$0.9995
0.0002846 Eth
$192,578,333.00
82,246,239.000 XRP
0.2533%
82
HTX
DOGE-USDT$0.9994
0.0002846 Eth
$192,564,174.00
627,521,092.865 DOGE
1.9328%
83
Binance
NEAR-USDT$0.9995
0.0002846 Eth
$191,419,737.00
38,628,838.500 NEAR
0.1190%
84
Azbit
DOGE-USDT$0.9995
0.0002847 Eth
$186,755,205.00
628,943,595.720 DOGE
1.9371%
85
BYDFi
BTC-USDT$1.00
0.0002851 Eth
$179,582,822.00
1,827.640 BTC
0.0000%
86
DigiFinex
TRX-USDT$0.9995
0.0002846 Eth
$167,537,422.00
666,387,858.400 TRX
2.0525%
87
BTSE
ETH-USDT$0.9994
0.0002848 Eth
$165,047,061.00
46,976.709 ETH
0.0001%
88
KuCoin
SOL-USDT$0.9995
0.0002846 Eth
$159,478,154.00
803,434.706 SOL
0.0025%
89
LBank
DOGE-USDT$0.9995
0.0002848 Eth
$154,638,234.00
459,016,427.000 DOGE
1.4138%
90
Azbit
SOL-USDT$0.9995
0.0002847 Eth
$153,910,660.00
826,744.477 SOL
0.0025%
91
Binance
VANA-USDT$0.9994
0.0002848 Eth
$150,704,494.00
8,281,426.660 VANA
0.0255%
92
Deepcoin
DOGE-USDT$0.9994
0.0002848 Eth
$149,063,213.00
494,406,142.011 DOGE
1.5228%
93
Bitunix
SOL-USDT$0.9997
0.0002847 Eth
$147,812,573.00
746,930.234 SOL
0.0023%
94
Binance
ARB-USDT$0.9996
0.0002871 Eth
$146,428,517.00
197,616,731.400 ARB
0.6087%
95
WhiteBIT
HBAR-USDT$0.9994
0.0002846 Eth
$144,866,873.00
522,905,808.730 HBAR
1.6105%
96
DigiFinex
SOL-USDT$0.9995
0.0002846 Eth
$143,960,836.00
725,443.050 SOL
0.0022%
97
DigiFinex
SUI-USDT$0.9994
0.0002846 Eth
$143,255,948.00
29,906,724.300 SUI
0.0921%
98
Ourbit
XRP-USDT$0.9996
0.0002850 Eth
$142,219,190.00
64,977,491.270 XRP
0.2001%
99
MEXC
ADA-USDT$0.9995
0.0002873 Eth
$124,710,866.00
130,584,322.310 ADA
0.4022%
100
BingX
ETH-USDT$0.9994
0.0002846 Eth
$92,345,532.00
27,688.792 ETH
0.0001%

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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