ETH Price: $3,704.16 (+2.94%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

70,929,452,093.657795 USDT

Holders

6,447,620 ( 0.085%)

Market

Price

$1.00 @ 0.000270 ETH (-0.08%)

Onchain Market Cap

$70,929,452,093.66

Circulating Supply Market Cap

$134,027,580,588.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0x9c80a03a263f79ecc6ed43d0d5c59efc1c83f919
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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):$108,843,107,597.00
Market Capitalization:$134,027,580,588.00
Circulating Supply:133,988,109,783.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
ETH-USDT$1.00
0.0002699 Eth
$1,828,770,637.00
498,262.495 ETH
0.0000%
2
Pionex
ETH-USDT$1.00
0.0002699 Eth
$1,526,219,515.00
416,062.382 ETH
0.0000%
3
Crypto.com Exchange
ETH-USDT$1.00
0.0002698 Eth
$1,465,283,960.00
395,564.470 ETH
0.0000%
4
Binance
BTC-USDT$1.00
0.0002699 Eth
$1,449,510,386.00
14,974.925 BTC
0.0000%
5
Tapbit
ETH-USDT$1.001
0.0002693 Eth
$1,436,061,715.00
391,170.044 ETH
0.0000%
6
Pionex
BTC-USDT$1.001
0.0002693 Eth
$1,313,992,987.00
13,571.372 BTC
0.0000%
7
CoinW
BTC-USDT$1.001
0.0002691 Eth
$1,293,306,163.00
13,383.778 BTC
0.0000%
8
Toobit
ETH-USDT$1.00
0.0002689 Eth
$1,204,711,715.00
328,255.850 ETH
0.0000%
9
BVOX
BTC-USDT$1.00
0.0002692 Eth
$1,142,372,748.00
11,800.702 BTC
0.0000%
10
Binance
DOGE-USDT$1.00
0.0002691 Eth
$998,784,247.00
2,349,803,456.000 DOGE
0.0110%
11
Bybit
BTC-USDT$1.00
0.0002699 Eth
$975,555,088.00
10,079.134 BTC
0.0000%
12
CoinW
ETH-USDT$1.001
0.0002693 Eth
$897,753,524.00
241,300.320 ETH
0.0000%
13
Ourbit
BTC-USDT$1.00
0.0002699 Eth
$872,878,961.00
9,017.708 BTC
0.0000%
14
BVOX
ETH-USDT$1.001
0.0002693 Eth
$839,877,761.00
228,819.608 ETH
0.0000%
15
Toobit
BTC-USDT$1.00
0.0002688 Eth
$839,354,235.00
8,659.610 BTC
0.0000%
16
P2B
ETH-USDT$1.001
0.0002695 Eth
$706,403,613.00
190,450.219 ETH
0.0000%
17
MEXC
ETH-USDT$0.9991
0.0002695 Eth
$700,395,774.00
189,134.661 ETH
0.0000%
18
WEEX
ETH-USDT$1.001
0.0002693 Eth
$693,000,539.00
189,115.445 ETH
0.0000%
19
Crypto.com Exchange
BTC-USDT$1.001
0.0002699 Eth
$666,443,830.00
6,906.705 BTC
0.0000%
20
DigiFinex
ETH-USDT$1.00
0.0002699 Eth
$655,024,803.00
176,799.733 ETH
0.0000%
21
Hotcoin
BTC-USDT$1.001
0.0002693 Eth
$642,682,414.00
6,654.279 BTC
0.0000%
22
Bybit
ETH-USDT$1.00
0.0002699 Eth
$617,751,024.00
168,484.110 ETH
0.0000%
23
Ourbit
ETH-USDT$1.00
0.0002689 Eth
$593,613,184.00
161,771.822 ETH
0.0000%
24
DigiFinex
BTC-USDT$1.00
0.0002699 Eth
$578,015,008.00
5,991.145 BTC
0.0000%
25
WEEX
BTC-USDT$1.00
0.0002694 Eth
$575,756,452.00
5,947.947 BTC
0.0000%
26
WhiteBIT
BTC-USDT$1.001
0.0002693 Eth
$573,713,879.00
5,940.161 BTC
0.0000%
27
Deepcoin
ETH-USDT$1.00
0.0002692 Eth
$572,675,725.00
153,831.060 ETH
0.0000%
28
Hotcoin
ETH-USDT$1.001
0.0002695 Eth
$569,307,475.00
153,486.291 ETH
0.0000%
29
LBank
BTC-USDT$1.001
0.0002691 Eth
$559,930,272.00
5,793.301 BTC
0.0000%
30
Binance
SOL-USDT$1.001
0.0002693 Eth
$548,246,905.00
2,266,455.338 SOL
0.0000%
31
Gate.io
XRP-USDT$1.00
0.0002699 Eth
$528,985,146.00
283,124,804.957 XRP
0.0013%
32
Bitget
XRP-USDT$1.00
0.0002699 Eth
$524,767,916.00
281,214,959.462 XRP
0.0013%
33
Bitget
ETH-USDT$1.00
0.0002699 Eth
$517,987,022.00
141,159.854 ETH
0.0000%
34
P2B
BTC-USDT$1.001
0.0002693 Eth
$517,088,922.00
5,352.337 BTC
0.0000%
35
XT.COM
ETH-USDT$1.00
0.0002699 Eth
$511,477,430.00
139,364.307 ETH
0.0000%
36
Binance
ENS-USDT$1.00
0.0002699 Eth
$507,116,572.00
12,357,796.510 ENS
0.0001%
37
OKX
ETH-USDT$1.00
0.0002699 Eth
$486,872,608.00
132,575.282 ETH
0.0000%
38
Bybit
XRP-USDT$1.00
0.0002699 Eth
$475,796,191.00
254,958,048.310 XRP
0.0012%
39
MEXC
BTC-USDT$1.00
0.0002691 Eth
$436,524,170.00
4,518.260 BTC
0.0000%
40
Binance
PEPE-USDT$1.00
0.0002688 Eth
$431,062,793.00
20,883,331,462,784.000 PEPE
97.4445%
41
Deepcoin
BTC-USDT$1.00
0.0002692 Eth
$428,440,654.00
4,434.021 BTC
0.0000%
42
WhiteBIT
ETH-USDT$1.001
0.0002691 Eth
$421,952,710.00
113,596.949 ETH
0.0000%
43
Bitunix
ETH-USDT$1.001
0.0002691 Eth
$412,959,949.00
111,218.782 ETH
0.0000%
44
Binance
ADA-USDT$1.00
0.0002694 Eth
$412,463,611.00
376,788,099.800 ADA
0.0018%
45
Binance
ACT-USDT$1.00
0.0002699 Eth
$404,655,994.00
593,979,332.900 ACT
0.0028%
46
Binance
XLM-USDT$1.001
0.0002691 Eth
$400,919,248.00
746,562,132.000 XLM
0.0035%
47
Bitunix
BTC-USDT$1.001
0.0002691 Eth
$394,254,101.00
4,079.816 BTC
0.0000%
48
OKX
BTC-USDT$1.00
0.0002699 Eth
$374,492,265.00
3,870.864 BTC
0.0000%
49
LBank
ETH-USDT$1.00
0.0002699 Eth
$364,768,248.00
98,456.523 ETH
0.0000%
50
Bitget
BTC-USDT$1.00
0.0002699 Eth
$343,550,954.00
3,551.677 BTC
0.0000%
51
OKX
DOGE-USDT$1.00
0.0002699 Eth
$336,939,829.00
792,904,228.528 DOGE
0.0037%
52
OKX
XRP-USDT$1.00
0.0002699 Eth
$310,504,033.00
166,520,329.803 XRP
0.0008%
53
Binance
THE-USDT$1.00
0.0002699 Eth
$288,034,921.00
99,459,490.800 THE
0.0005%
54
LATOKEN
ETH-USDT$1.00
0.0002690 Eth
$280,134,410.00
75,240.152 ETH
0.0000%
55
Azbit
BTC-USDT$1.001
0.0002691 Eth
$275,179,122.00
2,842.491 BTC
0.0000%
56
OrangeX
ETH-USDT$1.001
0.0002695 Eth
$273,074,074.00
74,430.438 ETH
0.0000%
57
Hotcoin
DOGE-USDT$1.001
0.0002695 Eth
$247,091,450.00
585,894,229.297 DOGE
0.0027%
58
Coinstore
ETH-USDT$1.00
0.0002694 Eth
$241,666,029.00
65,809.840 ETH
0.0000%
59
Coinbase Exchange
USDT-USD$1.00
0.0002699 Eth
$227,050,107.00
226,959,322.970 USDT
0.0011%
60
Biconomy.com
ETH-USDT$1.001
0.0002693 Eth
$205,571,039.00
55,998.626 ETH
0.0000%
61
BTSE
BTC-USDT$1.00
0.0002689 Eth
$191,959,942.00
1,985.197 BTC
0.0000%
62
LATOKEN
BTC-USDT$1.00
0.0002691 Eth
$188,373,725.00
1,949.683 BTC
0.0000%
63
Tapbit
BTC-USDT$1.00
0.0002694 Eth
$184,798,095.00
1,909.431 BTC
0.0000%
64
Biconomy.com
BTC-USDT$1.001
0.0002691 Eth
$184,758,704.00
1,908.435 BTC
0.0000%
65
Bitget
DOGE-USDT$1.00
0.0002699 Eth
$184,366,540.00
433,803,742.701 DOGE
0.0020%
66
KuCoin
XRP-USDT$1.00
0.0002699 Eth
$182,151,776.00
95,359,684.016 XRP
0.0004%
67
Binance
HBAR-USDT$1.00
0.0002699 Eth
$177,872,302.00
1,034,236,854.000 HBAR
0.0048%
68
Coinstore
BTC-USDT$1.001
0.0002694 Eth
$175,177,790.00
1,808.053 BTC
0.0000%
69
BTSE
ETH-USDT$1.00
0.0002690 Eth
$174,577,809.00
46,899.362 ETH
0.0000%
70
Binance
DOT-USDT$1.00
0.0002699 Eth
$172,891,524.00
19,380,505.240 DOT
0.0001%
71
HTX
BTC-USDT$1.00
0.0002699 Eth
$170,989,554.00
1,766.560 BTC
0.0000%
72
BigONE
BTC-USDT$1.00
0.0002699 Eth
$170,195,065.00
1,764.951 BTC
0.0000%
73
Binance
FIL-USDT$1.00
0.0002699 Eth
$166,766,546.00
25,159,999.670 FIL
0.0001%
74
MEXC
DOGE-USDT$1.001
0.0002693 Eth
$165,497,220.00
390,603,012.270 DOGE
0.0018%
75
Gate.io
ETH-USDT$1.00
0.0002699 Eth
$153,144,470.00
41,743.785 ETH
0.0000%
76
LBank
SOL-USDT$1.001
0.0002691 Eth
$146,548,039.00
612,319.377 SOL
0.0000%
77
Bitunix
DOGE-USDT$1.001
0.0002691 Eth
$141,773,617.00
334,905,987.000 DOGE
0.0016%
78
Bybit
DOGE-USDT$1.00
0.0002699 Eth
$130,767,749.00
307,643,799.400 DOGE
0.0014%
79
OKX
SOL-USDT$1.00
0.0002699 Eth
$129,017,844.00
534,456.972 SOL
0.0000%
80
WhiteBIT
ADA-USDT$1.00
0.0002690 Eth
$127,872,185.00
117,609,280.200 ADA
0.0005%
81
WhiteBIT
SOL-USDT$1.001
0.0002693 Eth
$127,795,384.00
535,351.571 SOL
0.0000%
82
LBank
DOGE-USDT$1.00
0.0002692 Eth
$124,341,151.00
293,600,750.000 DOGE
0.0014%
83
Binance
ARB-USDT$1.00
0.0002691 Eth
$111,644,016.00
116,350,064.800 ARB
0.0005%
84
WhiteBIT
ENS-USDT$1.001
0.0002691 Eth
$110,427,459.00
2,662,615.108 ENS
0.0000%
85
DigiFinex
DOGE-USDT$1.00
0.0002699 Eth
$109,492,284.00
259,929,079.930 DOGE
0.0012%
86
Deepcoin
SOL-USDT$1.001
0.0002691 Eth
$109,399,143.00
450,372.922 SOL
0.0000%
87
OrangeX
XRP-USDT$1.001
0.0002691 Eth
$106,725,103.00
57,199,617.000 XRP
0.0003%
88
KuCoin
ETH-USDT$1.00
0.0002699 Eth
$105,666,721.00
28,521.698 ETH
0.0000%
89
Binance
NEIRO-USDT$1.001
0.0002691 Eth
$101,469,794.00
54,042,836,664.000 NEIRO
0.2522%
90
WEEX
XRP-USDT$1.00
0.0002691 Eth
$100,054,337.00
52,277,771.420 XRP
0.0002%
91
OKX
FIL-USDT$1.00
0.0002699 Eth
$99,582,606.00
15,191,945.891 FIL
0.0001%
92
Bitget
X-USDT$1.00
0.0002699 Eth
$98,804,006.00
482,495,455,798.300 X
2.2514%
93
Binance
ENA-USDT$1.00
0.0002699 Eth
$95,149,478.00
118,949,051.480 ENA
0.0006%
94
DigiFinex
XRP-USDT$1.00
0.0002699 Eth
$93,317,603.00
48,866,173.000 XRP
0.0002%
95
WhiteBIT
DOGE-USDT$1.001
0.0002691 Eth
$91,782,475.00
216,531,736.700 DOGE
0.0010%
96
Toobit
DOGE-USDT$1.00
0.0002688 Eth
$88,622,427.00
208,240,804.000 DOGE
0.0010%
97
Gate.io
BTC-USDT$1.00
0.0002699 Eth
$86,796,675.00
896.841 BTC
0.0000%
98
BVOX
DOGE-USDT$1.00
0.0002688 Eth
$83,033,369.00
195,615,420.000 DOGE
0.0009%
99
Bitget
SOL-USDT$1.00
0.0002699 Eth
$82,249,271.00
340,104.792 SOL
0.0000%
100
BingX
ETH-USDT$1.00
0.0002699 Eth
$62,517,294.00
17,033.033 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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