ETH Price: $3,997.34 (+2.26%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

76,928,104,353.364467 USDT

Holders

6,558,571 ( 0.053%)

Market

Price

$1.00 @ 0.000250 ETH (+0.05%)

Onchain Market Cap

$76,928,104,353.36

Circulating Supply Market Cap

$140,358,255,375.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
367.895733 USDT

Value
$367.90 ( ~0.0920362927804081 Eth) [0.0000%]
0xf4B972d3633c41858b5007B0c5814a7D40d149c9
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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):$78,793,744,304.00
Market Capitalization:$140,358,255,375.00
Circulating Supply:140,253,672,849.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.00
0.0002505 Eth
$3,981,019,993.00
37,898.118 BTC
0.0000%
2
OrangeX
BTC-USDT$1.00
0.0002522 Eth
$3,155,496,430.00
30,073.386 BTC
0.0000%
3
BVOX
BTC-USDT$1.001
0.0002507 Eth
$2,976,267,641.00
28,315.586 BTC
0.0000%
4
Pionex
BTC-USDT$1.00
0.0002509 Eth
$2,877,650,823.00
27,411.589 BTC
0.0000%
5
Bybit
BTC-USDT$1.00
0.0002506 Eth
$2,421,583,755.00
23,078.776 BTC
0.0000%
6
CoinW
BTC-USDT$1.00
0.0002504 Eth
$2,203,779,186.00
20,575.843 BTC
0.0000%
7
Toobit
BTC-USDT$1.00
0.0002505 Eth
$2,156,354,241.00
20,530.093 BTC
0.0000%
8
Binance
ETH-USDT$1.00
0.0002515 Eth
$2,046,076,243.00
518,395.206 ETH
0.0000%
9
DigiFinex
BTC-USDT$1.00
0.0002506 Eth
$1,674,365,184.00
15,622.622 BTC
0.0000%
10
OrangeX
ETH-USDT$1.00
0.0002508 Eth
$1,644,908,016.00
416,929.825 ETH
0.0000%
11
WEEX
BTC-USDT$1.00
0.0002505 Eth
$1,604,653,038.00
15,268.668 BTC
0.0000%
12
Pionex
ETH-USDT$1.00
0.0002505 Eth
$1,555,917,193.00
394,419.172 ETH
0.0000%
13
Binance
FDUSD-USDT$1.001
0.0002507 Eth
$1,461,958,649.00
1,463,013,381.000 FDUSD
0.0077%
14
Toobit
ETH-USDT$1.001
0.0002507 Eth
$1,416,311,078.00
358,309.521 ETH
0.0000%
15
MEXC
ETH-USDT$1.001
0.0002507 Eth
$1,299,674,810.00
325,533.360 ETH
0.0000%
16
WhiteBIT
BTC-USDT$1.001
0.0002507 Eth
$1,266,165,493.00
11,814.208 BTC
0.0000%
17
Bitget
BTC-USDT$1.00
0.0002506 Eth
$1,192,464,963.00
11,345.134 BTC
0.0000%
18
MEXC
BTC-USDT$1.001
0.0002507 Eth
$1,179,423,525.00
11,004.069 BTC
0.0000%
19
OKX
BTC-USDT$1.00
0.0002505 Eth
$1,178,205,855.00
11,209.991 BTC
0.0000%
20
Bybit
ETH-USDT$1.00
0.0002506 Eth
$1,073,721,377.00
272,239.669 ETH
0.0000%
21
P2B
BTC-USDT$1.00
0.0002521 Eth
$1,033,271,906.00
9,665.425 BTC
0.0000%
22
AscendEX (BitMax)
BTC-USDT$1.00
0.0002506 Eth
$967,040,998.00
9,024.795 BTC
0.0000%
23
Bitget
ETH-USDT$1.00
0.0002506 Eth
$964,542,490.00
244,471.955 ETH
0.0000%
24
BVOX
ETH-USDT$1.00
0.0002504 Eth
$947,425,018.00
239,938.970 ETH
0.0000%
25
BitMart
BTC-USDT$1.00
0.0002506 Eth
$936,326,846.00
8,740.095 BTC
0.0000%
26
Bitunix
BTC-USDT$1.00
0.0002506 Eth
$880,503,559.00
8,225.549 BTC
0.0000%
27
XT.COM
BTC-USDT$1.001
0.0002507 Eth
$837,598,532.00
7,969.003 BTC
0.0000%
28
DigiFinex
ETH-USDT$1.00
0.0002506 Eth
$820,480,655.00
205,499.384 ETH
0.0000%
29
Binance
SOL-USDT$1.00
0.0002509 Eth
$815,628,089.00
3,707,690.316 SOL
0.0000%
30
LBank
BTC-USDT$1.00
0.0002504 Eth
$806,066,141.00
7,532.453 BTC
0.0000%
31
WEEX
ETH-USDT$1.00
0.0002505 Eth
$790,407,727.00
200,389.492 ETH
0.0000%
32
Hotcoin
BTC-USDT$1.00
0.0002506 Eth
$786,093,906.00
7,338.302 BTC
0.0000%
33
OKX
ETH-USDT$1.00
0.0002506 Eth
$749,633,674.00
189,925.371 ETH
0.0000%
34
CoinW
ETH-USDT$1.00
0.0002506 Eth
$726,085,510.00
181,806.515 ETH
0.0000%
35
BitMart
ETH-USDT$1.00
0.0002506 Eth
$724,296,005.00
181,357.527 ETH
0.0000%
36
Ourbit
ETH-USDT$1.00
0.0002506 Eth
$652,569,741.00
165,277.528 ETH
0.0000%
37
Binance
DOGE-USDT$1.00
0.0002516 Eth
$629,319,168.00
1,558,227,241.000 DOGE
0.0082%
38
WhiteBIT
ETH-USDT$1.00
0.0002505 Eth
$556,825,055.00
139,555.905 ETH
0.0000%
39
Binance
VANA-USDT$1.00
0.0002506 Eth
$552,748,615.00
21,013,045.570 VANA
0.0001%
40
AscendEX (BitMax)
ETH-USDT$1.00
0.0002506 Eth
$518,715,384.00
129,889.705 ETH
0.0000%
41
LATOKEN
BTC-USDT$1.00
0.0002505 Eth
$501,908,874.00
4,688.378 BTC
0.0000%
42
XT.COM
ETH-USDT$1.001
0.0002507 Eth
$492,639,106.00
124,604.773 ETH
0.0000%
43
BigONE
BTC-USDT$1.00
0.0002508 Eth
$458,182,144.00
4,282.562 BTC
0.0000%
44
Binance
PEPE-USDT$1.00
0.0002506 Eth
$448,320,486.00
18,916,755,139,312.000 PEPE
99.9513%
45
Gate.io
BTC-USDT$1.00
0.0002506 Eth
$426,322,196.00
4,055.891 BTC
0.0000%
46
Azbit
BTC-USDT$1.00
0.0002505 Eth
$413,271,096.00
3,952.362 BTC
0.0000%
47
HTX
BTC-USDT$1.00
0.0002505 Eth
$404,340,249.00
3,851.965 BTC
0.0000%
48
Bitunix
ETH-USDT$1.001
0.0002506 Eth
$396,729,771.00
99,371.392 ETH
0.0000%
49
Binance
SUI-USDT$1.00
0.0002506 Eth
$371,032,822.00
77,926,564.500 SUI
0.0004%
50
Binance
BNB-USDT$1.00
0.0002515 Eth
$331,562,237.00
463,751.142 BNB
0.0000%
51
Binance
LINK-USDT$1.00
0.0002505 Eth
$325,822,539.00
11,022,963.240 LINK
0.0001%
52
Biconomy.com
BTC-USDT$1.00
0.0002505 Eth
$323,026,327.00
3,080.470 BTC
0.0000%
53
Bitget
XRP-USDT$1.00
0.0002506 Eth
$319,497,122.00
130,850,392.381 XRP
0.0007%
54
Gate.io
ETH-USDT$1.00
0.0002506 Eth
$318,020,960.00
80,588.965 ETH
0.0000%
55
BTSE
BTC-USDT$1.00
0.0002504 Eth
$317,793,352.00
2,967.822 BTC
0.0000%
56
OKX
DOGE-USDT$1.00
0.0002506 Eth
$316,121,331.00
782,410,759.654 DOGE
0.0041%
57
LATOKEN
ETH-USDT$1.00
0.0002505 Eth
$314,594,604.00
78,825.417 ETH
0.0000%
58
Bybit
XRP-USDT$1.00
0.0002506 Eth
$307,165,227.00
126,282,156.130 XRP
0.0007%
59
Bybit
SOL-USDT$1.00
0.0002506 Eth
$300,161,078.00
1,365,193.349 SOL
0.0000%
60
KuCoin
BTC-USDT$1.00
0.0002506 Eth
$300,121,151.00
2,801.540 BTC
0.0000%
61
Coinstore
ETH-USDT$1.00
0.0002505 Eth
$297,519,899.00
75,404.463 ETH
0.0000%
62
Binance
TRX-USDT$1.00
0.0002506 Eth
$268,725,122.00
940,308,828.200 TRX
0.0050%
63
Hotcoin
ETH-USDT$1.00
0.0002504 Eth
$262,978,994.00
65,885.817 ETH
0.0000%
64
Binance
ENA-USDT$1.00
0.0002505 Eth
$261,028,365.00
213,015,263.530 ENA
0.0011%
65
Bitget
BGB-USDT$1.00
0.0002506 Eth
$259,450,501.00
80,293,695.599 BGB
0.0004%
66
OKX
XRP-USDT$1.00
0.0002506 Eth
$251,682,270.00
102,990,720.800 XRP
0.0005%
67
Binance
ADA-USDT$1.00
0.0002508 Eth
$240,683,365.00
221,823,449.400 ADA
0.0012%
68
KuCoin
XRP-USDT$1.00
0.0002506 Eth
$223,089,177.00
88,495,582.441 XRP
0.0005%
69
KuCoin
ETH-USDT$1.00
0.0002506 Eth
$221,440,105.00
55,455.598 ETH
0.0000%
70
LBank
ETH-USDT$1.00
0.0002505 Eth
$214,924,165.00
53,870.724 ETH
0.0000%
71
Biconomy.com
ETH-USDT$1.00
0.0002505 Eth
$214,451,742.00
54,362.027 ETH
0.0000%
72
Binance
FTM-USDT$1.00
0.0002505 Eth
$207,621,961.00
148,885,613.000 FTM
0.0008%
73
Bitget
DOGE-USDT$1.00
0.0002506 Eth
$186,017,340.00
460,155,736.057 DOGE
0.0024%
74
Gate.io
XRP-USDT$1.00
0.0002506 Eth
$178,513,562.00
73,216,218.170 XRP
0.0004%
75
WhiteBIT
SOL-USDT$1.001
0.0002513 Eth
$178,043,329.00
810,964.645 SOL
0.0000%
76
Binance
PNUT-USDT$1.00
0.0002506 Eth
$166,925,316.00
151,505,820.300 PNUT
0.0008%
77
BYDFi
BTC-USDT$1.00
0.0002506 Eth
$162,401,627.00
1,515.764 BTC
0.0000%
78
LBank
SOL-USDT$1.001
0.0002507 Eth
$161,938,911.00
735,670.593 SOL
0.0000%
79
Hibt
BTC-USDT$1.00
0.0002504 Eth
$158,603,689.00
1,509.942 BTC
0.0000%
80
OKX
SOL-USDT$1.00
0.0002506 Eth
$153,735,911.00
697,792.887 SOL
0.0000%
81
Binance
AVAX-USDT$1.00
0.0002510 Eth
$149,863,296.00
3,006,167.900 AVAX
0.0000%
82
Binance
HBAR-USDT$0.9985
0.0002513 Eth
$140,724,209.00
492,256,579.000 HBAR
0.0026%
83
CoinW
XRP-USDT$1.00
0.0002504 Eth
$134,179,020.00
53,187,563.000 XRP
0.0003%
84
Bybit
DOGE-USDT$1.00
0.0002506 Eth
$130,981,054.00
324,241,231.300 DOGE
0.0017%
85
HTX
ETH-USDT$1.00
0.0002505 Eth
$127,348,069.00
32,233.721 ETH
0.0000%
86
DigiFinex
TRX-USDT$1.00
0.0002506 Eth
$126,498,538.00
427,485,774.800 TRX
0.0023%
87
Coinbase Exchange
BTC-USDT$1.00
0.0002505 Eth
$110,295,761.00
1,029.970 BTC
0.0000%
88
LBank
DOGE-USDT$1.001
0.0002516 Eth
$108,517,437.00
263,491,733.000 DOGE
0.0014%
89
Binance
RUNE-USDT$1.00
0.0002505 Eth
$104,111,998.00
15,849,860.600 RUNE
0.0001%
90
Binance
DOT-USDT$1.00
0.0002510 Eth
$98,497,570.00
11,057,147.970 DOT
0.0001%
91
Hibt
ETH-USDT$1.00
0.0002505 Eth
$97,032,698.00
24,587.465 ETH
0.0000%
92
WhiteBIT
DOGE-USDT$1.00
0.0002505 Eth
$95,920,438.00
232,277,935.100 DOGE
0.0012%
93
Bitget
SUI-USDT$1.00
0.0002506 Eth
$95,713,651.00
20,095,225.370 SUI
0.0001%
94
Bitget
SOL-USDT$1.00
0.0002506 Eth
$94,170,880.00
427,353.052 SOL
0.0000%
95
Gate.io
DOGE-USDT$1.00
0.0002506 Eth
$90,894,272.00
224,853,777.520 DOGE
0.0012%
96
CoinW
DOGE-USDT$1.00
0.0002506 Eth
$87,680,497.00
212,274,769.039 DOGE
0.0011%
97
HTX
DOGE-USDT$1.00
0.0002505 Eth
$82,363,313.00
204,372,137.788 DOGE
0.0011%
98
WhiteBIT
ADA-USDT$1.001
0.0002507 Eth
$82,288,944.00
73,884,519.270 ADA
0.0004%
99
BingX
BTC-USDT$1.00
0.0002506 Eth
$74,844,214.00
714.048 BTC
0.0000%
100
BingX
ETH-USDT$1.00
0.0002506 Eth
$70,226,657.00
17,796.192 ETH
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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