ETH Price: $3,840.54 (-0.18%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

72,928,719,896.684091 USDT

Holders

6,507,440 ( 0.163%)

Market

Price

$1.00 @ 0.000260 ETH (-0.33%)

Onchain Market Cap

$72,817,941,171.16

Circulating Supply Market Cap

$135,485,016,339.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0x637e9ca29d5bf6cc69603da4eb1f3cacc2df6271
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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):$239,847,390,995.00
Market Capitalization:$135,485,016,339.00
Circulating Supply:135,691,101,232.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.00
0.0002625 Eth
$9,993,473,310.00
98,721.749 BTC
0.0000%
2
Pionex
BTC-USDT$0.9991
0.0002607 Eth
$6,881,682,627.00
68,023.036 BTC
0.0000%
3
BVOX
BTC-USDT$1.001
0.0002617 Eth
$6,657,616,215.00
65,755.969 BTC
0.0000%
4
Ourbit
BTC-USDT$0.9992
0.0002622 Eth
$6,116,728,412.00
60,488.563 BTC
0.0000%
5
CoinW
BTC-USDT$0.9992
0.0002622 Eth
$5,905,692,891.00
59,937.636 BTC
0.0000%
6
Bybit
BTC-USDT$1.00
0.0002625 Eth
$4,420,660,437.00
43,700.606 BTC
0.0000%
7
Hotcoin
BTC-USDT$0.9992
0.0002622 Eth
$4,074,558,215.00
41,395.592 BTC
0.0000%
8
DigiFinex
BTC-USDT$1.00
0.0002625 Eth
$3,831,623,991.00
38,652.495 BTC
0.0000%
9
BitMart
BTC-USDT$1.00
0.0002625 Eth
$3,483,272,910.00
35,417.292 BTC
0.0000%
10
Binance
ETH-USDT$1.001
0.0002603 Eth
$3,421,123,352.00
882,594.867 ETH
0.0000%
11
Binance
DOGE-USDT$1.00
0.0002625 Eth
$2,999,822,725.00
6,845,542,376.000 DOGE
0.0108%
12
MEXC
BTC-USDT$1.001
0.0002625 Eth
$2,988,155,058.00
30,302.132 BTC
0.0000%
13
Binance
XRP-USDT$1.00
0.0002601 Eth
$2,804,206,883.00
1,194,958,908.000 XRP
0.0019%
14
Bitunix
BTC-USDT$1.001
0.0002626 Eth
$2,645,540,049.00
26,831.588 BTC
0.0000%
15
Pionex
ETH-USDT$1.001
0.0002625 Eth
$2,475,195,544.00
638,367.631 ETH
0.0000%
16
Bitget
BTC-USDT$1.00
0.0002625 Eth
$2,404,156,493.00
23,806.416 BTC
0.0000%
17
OKX
BTC-USDT$1.00
0.0002625 Eth
$2,388,518,643.00
23,690.866 BTC
0.0000%
18
WhiteBIT
BTC-USDT$0.9985
0.0002624 Eth
$2,324,428,096.00
23,525.834 BTC
0.0000%
19
LBank
BTC-USDT$0.9991
0.0002621 Eth
$2,204,193,716.00
22,368.399 BTC
0.0000%
20
XT.COM
BTC-USDT$1.00
0.0002610 Eth
$2,180,254,965.00
21,527.670 BTC
0.0000%
21
P2B
BTC-USDT$1.001
0.0002613 Eth
$1,947,318,177.00
19,678.531 BTC
0.0000%
22
Binance
FDUSD-USDT$1.00
0.0002625 Eth
$1,759,923,528.00
1,762,577,148.000 FDUSD
0.0028%
23
Bybit
ETH-USDT$1.00
0.0002625 Eth
$1,674,111,481.00
432,136.682 ETH
0.0000%
24
Hotcoin
ETH-USDT$1.00
0.0002589 Eth
$1,643,257,715.00
425,753.792 ETH
0.0000%
25
Binance
SOL-USDT$1.00
0.0002624 Eth
$1,557,045,280.00
6,600,693.582 SOL
0.0000%
26
BitMart
ETH-USDT$1.001
0.0002623 Eth
$1,553,127,817.00
407,199.785 ETH
0.0000%
27
BVOX
ETH-USDT$0.9992
0.0002622 Eth
$1,480,390,931.00
382,500.599 ETH
0.0000%
28
Bitget
ETH-USDT$1.00
0.0002625 Eth
$1,407,811,164.00
363,348.643 ETH
0.0000%
29
Binance
TRX-USDT$1.00
0.0002624 Eth
$1,233,113,526.00
3,727,654,165.400 TRX
0.0059%
30
DigiFinex
ETH-USDT$1.00
0.0002625 Eth
$1,216,393,099.00
317,009.941 ETH
0.0000%
31
BigONE
BTC-USDT$0.9991
0.0002621 Eth
$1,144,280,805.00
11,617.969 BTC
0.0000%
32
CoinW
ETH-USDT$0.9987
0.0002624 Eth
$1,108,227,062.00
291,241.201 ETH
0.0000%
33
OKX
DOGE-USDT$1.001
0.0002623 Eth
$1,086,816,130.00
2,478,252,438.678 DOGE
0.0039%
34
HTX
BTC-USDT$1.001
0.0002623 Eth
$1,077,069,387.00
10,624.139 BTC
0.0000%
35
OKX
ETH-USDT$1.001
0.0002623 Eth
$990,135,789.00
255,336.884 ETH
0.0000%
36
Coinbase Exchange
USDT-USD$1.00
0.0002625 Eth
$982,651,172.00
982,287,725.660 USDT
0.0016%
37
Ourbit
ETH-USDT$1.00
0.0002626 Eth
$969,088,359.00
249,977.753 ETH
0.0000%
38
XT.COM
ETH-USDT$1.001
0.0002602 Eth
$951,697,549.00
245,476.166 ETH
0.0000%
39
Bybit
XRP-USDT$1.00
0.0002625 Eth
$938,220,785.00
399,894,441.790 XRP
0.0006%
40
AscendEX (BitMax)
BTC-USDT$1.00
0.0002625 Eth
$931,011,538.00
9,408.159 BTC
0.0000%
41
Gate.io
BTC-USDT$1.00
0.0002625 Eth
$905,702,311.00
8,953.941 BTC
0.0000%
42
Binance
PEPE-USDT$0.999
0.0002613 Eth
$873,467,859.00
40,361,822,356,423.000 PEPE
63.7316%
43
Binance
BNB-USDT$1.00
0.0002624 Eth
$841,722,258.00
1,161,690.157 BNB
0.0000%
44
Bitunix
ETH-USDT$1.001
0.0002625 Eth
$788,975,930.00
206,645.044 ETH
0.0000%
45
Binance
SUI-USDT$1.00
0.0002617 Eth
$766,685,475.00
191,170,493.200 SUI
0.0003%
46
Bitget
XRP-USDT$1.00
0.0002625 Eth
$764,391,766.00
325,708,792.784 XRP
0.0005%
47
Binance
SHIB-USDT$0.9985
0.0002615 Eth
$719,192,691.00
22,813,403,567,685.000 SHIB
36.0225%
48
Coinstore
BTC-USDT$1.00
0.0002625 Eth
$653,927,366.00
6,448.297 BTC
0.0000%
49
Biconomy.com
BTC-USDT$1.001
0.0002603 Eth
$606,930,625.00
5,987.114 BTC
0.0000%
50
Bitget
DOGE-USDT$1.00
0.0002625 Eth
$606,702,277.00
1,384,305,209.333 DOGE
0.0022%
51
KuCoin
BTC-USDT$1.00
0.0002625 Eth
$553,857,718.00
5,589.621 BTC
0.0000%
52
Gate.io
ETH-USDT$1.00
0.0002625 Eth
$541,862,275.00
140,056.738 ETH
0.0000%
53
Gate.io
XRP-USDT$1.00
0.0002625 Eth
$532,443,676.00
226,639,825.849 XRP
0.0004%
54
WhiteBIT
XRP-USDT$1.001
0.0002617 Eth
$531,911,202.00
227,903,660.550 XRP
0.0004%
55
DigiFinex
TRX-USDT$1.00
0.0002625 Eth
$519,974,074.00
1,606,357,898.700 TRX
0.0025%
56
Bybit
SOL-USDT$1.00
0.0002625 Eth
$513,781,564.00
2,183,542.835 SOL
0.0000%
57
AscendEX (BitMax)
ETH-USDT$1.00
0.0002625 Eth
$509,196,170.00
132,965.690 ETH
0.0000%
58
Gate.io
DOGE-USDT$1.00
0.0002625 Eth
$501,217,529.00
1,144,091,702.250 DOGE
0.0018%
59
Binance
HBAR-USDT$1.00
0.0002617 Eth
$494,667,238.00
1,658,267,813.000 HBAR
0.0026%
60
Kraken
USDT-USD$1.00
0.0002625 Eth
$474,462,551.00
474,301,288.653 USDT
0.0007%
61
CoinTR
BTC-USDT$0.9992
0.0002622 Eth
$471,797,975.00
4,666.300 BTC
0.0000%
62
Binance
ADA-USDT$1.001
0.0002615 Eth
$469,954,579.00
392,434,180.200 ADA
0.0006%
63
Binance
WLD-USDT$1.00
0.0002625 Eth
$467,101,641.00
131,478,903.900 WLD
0.0002%
64
LBank
ETH-USDT$1.00
0.0002619 Eth
$464,199,519.00
121,081.587 ETH
0.0000%
65
Binance
PNUT-USDT$1.00
0.0002625 Eth
$455,129,760.00
334,818,790.200 PNUT
0.0005%
66
Bitunix
DOGE-USDT$1.00
0.0002618 Eth
$421,796,206.00
975,866,755.000 DOGE
0.0015%
67
Bybit
DOGE-USDT$1.00
0.0002625 Eth
$421,325,998.00
961,177,827.600 DOGE
0.0015%
68
Coinstore
ETH-USDT$1.00
0.0002624 Eth
$385,198,745.00
99,265.677 ETH
0.0000%
69
BYDFi
BTC-USDT$1.00
0.0002610 Eth
$384,664,389.00
3,859.286 BTC
0.0000%
70
Binance
RENDER-USDT$1.001
0.0002603 Eth
$373,128,585.00
36,382,504.320 RENDER
0.0001%
71
MEXC
DOGE-USDT$1.001
0.0002625 Eth
$367,996,372.00
856,190,149.700 DOGE
0.0014%
72
WhiteBIT
DOGE-USDT$1.00
0.0002625 Eth
$360,871,670.00
833,491,089.200 DOGE
0.0013%
73
OKX
SOL-USDT$1.001
0.0002623 Eth
$355,168,561.00
1,504,029.797 SOL
0.0000%
74
Binance
SAND-USDT$1.00
0.0002625 Eth
$347,093,635.00
372,432,805.000 SAND
0.0006%
75
DigiFinex
DOGE-USDT$1.00
0.0002625 Eth
$345,727,751.00
797,771,267.520 DOGE
0.0013%
76
Biconomy.com
ETH-USDT$1.001
0.0002621 Eth
$302,722,356.00
77,963.393 ETH
0.0000%
77
Coinbase Exchange
USDT-USDC$0.9999
0.0002628 Eth
$280,395,444.00
280,425,690.210 USDT
0.0004%
78
HTX
ETH-USDT$1.001
0.0002623 Eth
$275,404,439.00
70,936.055 ETH
0.0000%
79
Binance
AVAX-USDT$1.00
0.0002625 Eth
$271,870,532.00
5,201,839.480 AVAX
0.0000%
80
Toobit
XRP-USDT$1.001
0.0002621 Eth
$268,400,658.00
114,279,188.000 XRP
0.0002%
81
Binance
DOT-USDT$1.001
0.0002603 Eth
$263,428,254.00
24,631,632.640 DOT
0.0000%
82
BTSE
ETH-USDT$0.9991
0.0002621 Eth
$262,072,166.00
68,690.867 ETH
0.0000%
83
WhiteBIT
SUI-USDT$1.001
0.0002618 Eth
$261,367,922.00
63,546,541.999 SUI
0.0001%
84
KuCoin
ETH-USDT$1.00
0.0002625 Eth
$258,731,447.00
67,451.551 ETH
0.0000%
85
Toobit
DOGE-USDT$1.001
0.0002621 Eth
$255,561,040.00
582,505,450.000 DOGE
0.0009%
86
Binance
ACT-USDT$1.00
0.0002625 Eth
$245,491,040.00
430,603,636.000 ACT
0.0007%
87
Azbit
BTC-USDT$0.9993
0.0002604 Eth
$235,670,981.00
2,312.610 BTC
0.0000%
88
Slex
BTC-USDT$1.001
0.0002617 Eth
$220,674,481.00
2,178.120 BTC
0.0000%
89
OrangeX
DOGE-USDT$1.001
0.0002613 Eth
$213,648,995.00
488,177,705.000 DOGE
0.0008%
90
Binance
NEAR-USDT$1.00
0.0002625 Eth
$211,885,990.00
27,814,162.500 NEAR
0.0000%
91
Binance
NEIRO-USDT$0.9985
0.0002615 Eth
$211,338,338.00
119,524,714,092.000 NEIRO
0.1887%
92
Binance
FIL-USDT$1.00
0.0002625 Eth
$198,017,148.00
24,791,588.000 FIL
0.0000%
93
Bitunix
SOL-USDT$1.001
0.0002626 Eth
$194,031,128.00
837,138.044 SOL
0.0000%
94
LBank
SOL-USDT$0.9985
0.0002624 Eth
$192,550,912.00
829,050.245 SOL
0.0000%
95
WhiteBIT
JASMY-USDT$1.00
0.0002625 Eth
$168,264,291.00
3,108,658,650.088 JASMY
0.0049%
96
Binance
ENA-USDT$1.00
0.0002625 Eth
$157,014,211.00
168,678,777.120 ENA
0.0003%
97
WhiteBIT
TRX-USDT$0.9985
0.0002624 Eth
$151,714,447.00
470,327,995.890 TRX
0.0007%
98
KuCoin
SOL-USDT$1.00
0.0002625 Eth
$140,058,063.00
600,681.068 SOL
0.0000%
99
BingX
BTC-USDT$1.00
0.0002625 Eth
$123,072,640.00
1,217.802 BTC
0.0000%
100
DigiFinex
USDC-USDT$1.00
0.0002625 Eth
$102,203,831.00
102,226,559.000 USDC
0.0002%

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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