ETH Price: $2,686.37 (-1.75%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

53,983,320,457.505922 USDT

Holders

5,939,002 ( 0.021%)

Market

Price

$1.00 @ 0.000372 ETH (-0.05%)

Onchain Market Cap

$53,983,320,457.51

Circulating Supply Market Cap

$118,074,794,145.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0xb82c9df789885c80c269253d76df10614a85c148
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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):$40,432,139,769.00
Market Capitalization:$118,074,794,145.00
Circulating Supply:118,039,332,678.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Bybit
BTC-USDT$1.00
0.0003723 Eth
$1,743,830,148.00
27,514.730 BTC
0.0000%
2
MEXC
BTC-USDT$1.00
0.0003725 Eth
$1,337,562,081.00
21,279.540 BTC
0.0000%
3
Binance
BTC-USDT$1.00
0.0003723 Eth
$1,320,299,480.00
20,849.543 BTC
0.0000%
4
Binance
ETH-USDT$1.00
0.0003722 Eth
$599,068,170.00
221,367.641 ETH
0.0000%
5
Binance
USDC-USDT$1.00
0.0003725 Eth
$582,243,711.00
582,347,998.000 USDC
0.0108%
6
CoinW
BTC-USDT$1.00
0.0003725 Eth
$520,108,136.00
8,276.746 BTC
0.0000%
7
LBank
BTC-USDT$1.00
0.0003725 Eth
$517,426,867.00
8,232.699 BTC
0.0000%
8
Binance
SOL-USDT$1.00
0.0003723 Eth
$497,305,191.00
3,136,831.891 SOL
0.0001%
9
Binance
FDUSD-USDT$1.00
0.0003723 Eth
$496,180,139.00
496,710,769.000 FDUSD
0.0092%
10
FameEX
BTC-USDT$1.00
0.0003723 Eth
$454,745,453.00
7,179.687 BTC
0.0000%
11
OKX
BTC-USDT$1.00
0.0003723 Eth
$417,628,140.00
6,592.186 BTC
0.0000%
12
LBank
ETH-USDT$1.00
0.0003725 Eth
$408,555,393.00
152,106.756 ETH
0.0000%
13
Bybit
ETH-USDT$1.00
0.0003723 Eth
$398,735,527.00
147,409.007 ETH
0.0000%
14
DigiFinex
BTC-USDT$1.00
0.0003723 Eth
$358,275,056.00
5,700.920 BTC
0.0000%
15
Bitget
BTC-USDT$1.00
0.0003723 Eth
$234,789,924.00
3,707.545 BTC
0.0000%
16
HTX
BTC-USDT$1.00
0.0003723 Eth
$220,670,299.00
3,481.182 BTC
0.0000%
17
Coinbase Exchange
USDT-USD$1.00
0.0003723 Eth
$206,472,273.00
206,459,885.460 USDT
0.0038%
18
Bybit
SOL-USDT$1.00
0.0003723 Eth
$187,564,108.00
1,183,534.067 SOL
0.0000%
19
DigiFinex
ETH-USDT$1.00
0.0003723 Eth
$174,827,422.00
65,085.497 ETH
0.0000%
20
Biconomy.com
ETH-USDT$1.00
0.0003725 Eth
$169,355,383.00
62,590.093 ETH
0.0000%
21
OKX
ETH-USDT$1.00
0.0003723 Eth
$168,319,846.00
62,249.886 ETH
0.0000%
22
MEXC
ETH-USDT$1.00
0.0003725 Eth
$158,367,954.00
58,961.003 ETH
0.0000%
23
Kraken
USDT-USD$1.00
0.0003723 Eth
$156,093,066.00
156,077,458.461 USDT
0.0029%
24
Gate.io
BTC-USDT$1.00
0.0003723 Eth
$153,359,207.00
2,421.124 BTC
0.0000%
25
BitMart
ETH-USDT$1.00
0.0003723 Eth
$145,453,964.00
54,179.874 ETH
0.0000%
26
Tapbit
ETH-USDT$1.00
0.0003725 Eth
$143,176,519.00
52,918.755 ETH
0.0000%
27
KuCoin
BTC-USDT$1.00
0.0003723 Eth
$140,131,322.00
2,228.909 BTC
0.0000%
28
CoinW
ETH-USDT$1.00
0.0003725 Eth
$134,344,484.00
50,033.398 ETH
0.0000%
29
Bitget
ETH-USDT$1.00
0.0003723 Eth
$118,937,655.00
43,927.520 ETH
0.0000%
30
Kraken
USDT-EUR$1.00
0.0003724 Eth
$109,402,359.00
109,381,829.719 USDT
0.0020%
31
HTX
ETH-USDT$1.00
0.0003723 Eth
$100,856,525.00
37,257.271 ETH
0.0000%
32
OKX
SOL-USDT$1.00
0.0003723 Eth
$89,361,800.00
563,718.935 SOL
0.0000%
33
Bybit
USDC-USDT$1.00
0.0003723 Eth
$84,763,134.00
84,782,712.210 USDC
0.0016%
34
Gate.io
ETH-USDT$1.00
0.0003723 Eth
$84,315,271.00
31,168.085 ETH
0.0000%
35
BingX
BTC-USDT$1.00
0.0003723 Eth
$78,752,916.00
1,243.186 BTC
0.0000%
36
Dex-Trade
BTC-USDT$1.00
0.0003723 Eth
$77,863,361.00
1,238.876 BTC
0.0000%
37
Bitget
SOL-USDT$1.00
0.0003723 Eth
$73,618,184.00
464,409.832 SOL
0.0000%
38
Gate.io
SOL-USDT$1.00
0.0003723 Eth
$66,422,306.00
419,099.079 SOL
0.0000%
39
Bitunix
SOL-USDT$1.00
0.0003728 Eth
$57,576,327.00
364,373.300 SOL
0.0000%
40
Gate.io
TON-USDT$1.00
0.0003723 Eth
$50,141,434.00
9,270,867.880 TON
0.0002%
41
Gate.io
PEPE-USDT$1.00
0.0003723 Eth
$47,520,574.00
5,400,823,234,261.800 PEPE
99.9547%
42
WhiteBIT
AVAX-USDT$1.00
0.0003725 Eth
$39,863,392.00
1,503,775.193 AVAX
0.0000%
43
P2B
BNB-USDT$1.00
0.0003725 Eth
$38,811,521.00
70,186.660 BNB
0.0000%
44
DigiFinex
SOL-USDT$1.00
0.0003723 Eth
$37,793,493.00
239,285.940 SOL
0.0000%
45
C-Patex
BTC-USDT$1.00
0.0003723 Eth
$30,261,275.00
481.371 BTC
0.0000%
46
DigiFinex
USDC-USDT$1.00
0.0003723 Eth
$24,145,874.00
24,151,146.000 USDC
0.0004%
47
OrangeX
TRX-USDT$1.00
0.0003725 Eth
$22,385,982.00
135,642,478.500 TRX
0.0025%
48
Bitget
XRP-USDT$1.00
0.0003723 Eth
$22,342,198.00
37,855,735.873 XRP
0.0007%
49
FMFW.io
BTC-USDT$1.00
0.0003725 Eth
$21,754,517.00
346.068 BTC
0.0000%
50
Bitfinex
BTC-USDT$1.00
0.0003723 Eth
$18,640,504.00
296.591 BTC
0.0000%
51
BVOX
BNB-USDT$1.00
0.0003723 Eth
$18,596,290.00
33,481.616 BNB
0.0000%
52
Bitunix
USDC-USDT$1.00
0.0003728 Eth
$17,854,002.00
17,855,441.194 USDC
0.0003%
53
Kraken
BTC-USDT$1.00
0.0003723 Eth
$14,214,718.00
226.137 BTC
0.0000%
54
Gate.io
ASTR-USDT$1.00
0.0003723 Eth
$13,832,017.00
186,617,772.240 ASTR
0.0035%
55
OrangeX
SOL-USDT$1.00
0.0003725 Eth
$12,875,105.00
81,151.330 SOL
0.0000%
56
Gate.io
XRP-USDT$1.00
0.0003723 Eth
$12,397,468.00
21,087,349.944 XRP
0.0004%
57
Gate.io
BNB-USDT$1.00
0.0003723 Eth
$12,364,781.00
22,199.312 BNB
0.0000%
58
OKX
USDC-USDT$1.00
0.0003723 Eth
$11,829,730.00
11,833,362.242 USDC
0.0002%
59
Gate.io
TRX-USDT$1.00
0.0003723 Eth
$11,091,094.00
67,129,270.840 TRX
0.0012%
60
Gate.io
DOGE-USDT$1.00
0.0003723 Eth
$10,630,025.00
99,646,687.650 DOGE
0.0018%
61
Gate.io
NEAR-USDT$1.00
0.0003723 Eth
$10,348,204.00
2,134,100.810 NEAR
0.0000%
62
FMFW.io
ETH-USDT$1.00
0.0003725 Eth
$9,603,316.00
3,575.045 ETH
0.0000%
63
Bybit
USDE-USDT$1.00
0.0003723 Eth
$9,548,182.00
9,560,198.570 USDE
0.0002%
64
DigiFinex
SUI-USDT$1.00
0.0003723 Eth
$9,436,314.00
9,967,824.400 SUI
0.0002%
65
BingX
FDUSD-USDT$1.00
0.0003723 Eth
$9,222,418.00
9,231,974.846 FDUSD
0.0002%
66
Gate.io
LINK-USDT$1.00
0.0003723 Eth
$9,155,879.00
748,787.230 LINK
0.0000%
67
BingX
SOL-USDT$1.00
0.0003723 Eth
$9,152,862.00
57,735.364 SOL
0.0000%
68
Bitfinex
USDT-USD$1.002
0.0003730 Eth
$8,974,861.00
8,956,946.978 USDT
0.0002%
69
Tapbit
XRP-USDT$1.00
0.0003725 Eth
$8,859,218.00
15,006,963.790 XRP
0.0003%
70
OrangeX
XRP-USDT$1.00
0.0003725 Eth
$8,794,394.00
14,897,433.000 XRP
0.0003%
71
Kraken
USDC-USDT$1.00
0.0003724 Eth
$7,606,371.00
7,607,825.730 USDC
0.0001%
72
WEEX
BNB-USDT$1.00
0.0003723 Eth
$7,339,798.00
13,172.517 BNB
0.0000%
73
BingX
USDC-USDT$1.00
0.0003723 Eth
$7,224,724.00
7,226,453.057 USDC
0.0001%
74
Gate.io
FIL-USDT$1.00
0.0003723 Eth
$7,202,363.00
1,796,554.690 FIL
0.0000%
75
FMFW.io
USDT-USDC$1.00
0.0003725 Eth
$7,077,611.00
7,076,704.000 USDT
0.0001%
76
Gate.io
SUI-USDT$1.00
0.0003723 Eth
$7,057,321.00
7,382,827.540 SUI
0.0001%
77
FMFW.io
SOL-USDT$1.00
0.0003725 Eth
$6,769,507.00
42,848.031 SOL
0.0000%
78
Gate.io
ICP-USDT$1.00
0.0003723 Eth
$6,211,991.00
756,224.780 ICP
0.0000%
79
HashKey Exchange
USDT-USD$1.00
0.0003723 Eth
$5,455,429.00
5,453,541.272 USDT
0.0001%
80
DigiFinex
XRP-USDT$1.00
0.0003723 Eth
$5,272,901.00
8,941,695.000 XRP
0.0002%
81
Gate.io
ETC-USDT$1.00
0.0003723 Eth
$4,942,771.00
250,482.738 ETC
0.0000%
82
Gate.io
BCH-USDT$1.00
0.0003723 Eth
$4,762,876.00
13,735.644 BCH
0.0000%
83
WEEX
USDC-USDT$1.00
0.0003723 Eth
$4,641,913.00
4,642,995.000 USDC
0.0001%
84
Gate.io
ARB-USDT$1.00
0.0003723 Eth
$4,617,894.00
7,902,327.970 ARB
0.0001%
85
Gate.io
LTC-USDT$1.00
0.0003723 Eth
$4,612,413.00
72,232.098 LTC
0.0000%
86
Tapbit
SOL-USDT$1.00
0.0003725 Eth
$4,603,357.00
29,035.850 SOL
0.0000%
87
XT.COM
DOGE-USDT$1.00
0.0003725 Eth
$4,366,505.00
40,945,727.000 DOGE
0.0008%
88
Gate.io
AAVE-USDT$1.00
0.0003723 Eth
$4,315,575.00
32,995.090 AAVE
0.0000%
89
Gate.io
USDC-USDT$1.00
0.0003723 Eth
$4,166,413.00
4,167,673.447 USDC
0.0001%
90
Gate.io
APT-USDT$1.00
0.0003723 Eth
$4,049,856.00
567,685.510 APT
0.0000%
91
Gate.io
LQTY-USDT$1.00
0.0003723 Eth
$3,617,182.00
3,653,550.340 LQTY
0.0001%
92
Bitget
USDC-USDT$1.00
0.0003723 Eth
$3,317,334.00
3,318,157.842 USDC
0.0001%
93
BTSE
USDT-USD$1.00
0.0003724 Eth
$2,922,766.00
2,921,597.074 USDT
0.0001%
94
WOO X
ETH-USDT$1.00
0.0003725 Eth
$2,503,843.00
932.504 ETH
0.0000%
95
Fastex
FTN-USDT$1.00
0.0003722 Eth
$2,488,719.00
997,334.678 FTN
0.0000%
96
Gate.io
DOT-USDT$1.00
0.0003723 Eth
$2,077,608.00
448,940.860 DOT
0.0000%
97
WOO X
SOL-USDT$1.00
0.0003725 Eth
$1,658,180.00
10,496.590 SOL
0.0000%
98
Tapbit
USDC-USDT$1.00
0.0003725 Eth
$1,625,102.00
1,625,385.993 USDC
0.0000%
99
Tapbit
BNB-USDT$1.00
0.0003725 Eth
$1,150,591.00
2,069.137 BNB
0.0000%
100
Gate.io
XLM-USDT$1.00
0.0003723 Eth
$401,751.00
4,101,255.770 XLM
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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