ETH Price: $3,866.18 (+0.17%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

72,928,719,896.684091 USDT

Holders

6,509,471 ( -0.002%)

Market

Price

$1.00 @ 0.000259 ETH (-0.14%)

Onchain Market Cap

$72,920,260,165.18

Circulating Supply Market Cap

$136,903,848,772.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0x8503493be3ba99479615ddca2c523b4c2cc763c6
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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):$150,113,077,730.00
Market Capitalization:$136,903,848,772.00
Circulating Supply:136,630,946,804.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.00
0.0002591 Eth
$11,365,814,188.00
113,183.284 BTC
0.0000%
2
BVOX
BTC-USDT$1.00
0.0002591 Eth
$6,838,126,533.00
67,783.128 BTC
0.0000%
3
Bybit
BTC-USDT$1.00
0.0002591 Eth
$4,773,966,299.00
47,437.545 BTC
0.0000%
4
DigiFinex
BTC-USDT$1.00
0.0002591 Eth
$4,306,847,218.00
44,010.338 BTC
0.0000%
5
Binance
ETH-USDT$0.9998
0.0002590 Eth
$3,650,308,094.00
944,833.464 ETH
0.0000%
6
Bitunix
BTC-USDT$1.00
0.0002591 Eth
$2,998,491,230.00
30,631.746 BTC
0.0000%
7
Bitget
BTC-USDT$1.00
0.0002591 Eth
$2,940,870,608.00
29,445.518 BTC
0.0000%
8
OKX
BTC-USDT$1.00
0.0002591 Eth
$2,863,348,667.00
28,774.709 BTC
0.0000%
9
OrangeX
BTC-USDT$1.00
0.0002591 Eth
$2,403,916,442.00
23,903.813 BTC
0.0000%
10
LBank
BTC-USDT$1.00
0.0002591 Eth
$2,347,457,455.00
23,981.812 BTC
0.0000%
11
Binance
XRP-USDT$1.001
0.0002597 Eth
$2,274,865,877.00
970,627,437.000 XRP
0.0029%
12
P2B
BTC-USDT$1.00
0.0002591 Eth
$1,998,585,618.00
20,427.640 BTC
0.0000%
13
Bybit
ETH-USDT$1.00
0.0002591 Eth
$1,762,264,612.00
455,757.792 ETH
0.0000%
14
BitMart
ETH-USDT$1.00
0.0002591 Eth
$1,738,572,633.00
449,959.103 ETH
0.0000%
15
Bitget
ETH-USDT$1.00
0.0002591 Eth
$1,589,505,847.00
411,330.831 ETH
0.0000%
16
DigiFinex
ETH-USDT$1.00
0.0002591 Eth
$1,319,432,115.00
341,531.093 ETH
0.0000%
17
OKX
ETH-USDT$1.00
0.0002591 Eth
$1,174,066,152.00
304,640.428 ETH
0.0000%
18
HTX
BTC-USDT$1.00
0.0002591 Eth
$1,156,123,078.00
11,481.320 BTC
0.0000%
19
Gate.io
BTC-USDT$0.9997
0.0002590 Eth
$1,061,995,493.00
10,583.487 BTC
0.0000%
20
Binance
TRX-USDT$1.001
0.0002594 Eth
$1,016,704,619.00
3,092,305,714.500 TRX
0.0093%
21
OKX
DOGE-USDT$1.00
0.0002591 Eth
$1,002,832,439.00
2,277,649,721.901 DOGE
0.0069%
22
AscendEX (BitMax)
BTC-USDT$1.00
0.0002591 Eth
$917,931,726.00
9,378.744 BTC
0.0000%
23
Bitunix
ETH-USDT$1.00
0.0002591 Eth
$862,576,958.00
223,146.872 ETH
0.0000%
24
Bybit
XRP-USDT$1.00
0.0002591 Eth
$763,912,083.00
325,859,322.720 XRP
0.0010%
25
Bitget
XRP-USDT$1.00
0.0002591 Eth
$647,489,591.00
276,411,113.335 XRP
0.0008%
26
KuCoin
BTC-USDT$0.9997
0.0002590 Eth
$634,233,446.00
6,484.492 BTC
0.0000%
27
Bitget
DOGE-USDT$1.00
0.0002591 Eth
$612,464,630.00
1,393,109,420.001 DOGE
0.0042%
28
Bybit
USDC-USDT$1.00
0.0002591 Eth
$603,147,000.00
603,515,423.680 USDC
0.0018%
29
Gate.io
ETH-USDT$0.9997
0.0002590 Eth
$603,057,251.00
156,250.976 ETH
0.0000%
30
Bybit
SOL-USDT$1.00
0.0002591 Eth
$597,084,186.00
2,520,170.298 SOL
0.0000%
31
Binance
WLD-USDT$1.001
0.0002597 Eth
$547,019,235.00
148,651,218.000 WLD
0.0004%
32
LATOKEN
ETH-USDT$0.9997
0.0002590 Eth
$540,965,904.00
140,065.841 ETH
0.0000%
33
Binance
SHIB-USDT$1.00
0.0002591 Eth
$532,209,659.00
16,935,532,515,161.000 SHIB
51.0351%
34
AscendEX (BitMax)
ETH-USDT$1.00
0.0002591 Eth
$513,171,746.00
132,817.166 ETH
0.0000%
35
Binance
PNUT-USDT$1.00
0.0002591 Eth
$483,611,615.00
348,134,088.400 PNUT
0.0010%
36
Gate.io
XRP-USDT$0.9997
0.0002590 Eth
$481,641,981.00
205,778,548.155 XRP
0.0006%
37
Gate.io
DOGE-USDT$0.9997
0.0002590 Eth
$477,107,414.00
1,083,821,451.090 DOGE
0.0033%
38
Binance
ADA-USDT$0.9998
0.0002590 Eth
$467,613,628.00
390,438,519.500 ADA
0.0012%
39
WhiteBIT
XRP-USDT$1.00
0.0002591 Eth
$462,189,413.00
198,306,078.510 XRP
0.0006%
40
OKX
SOL-USDT$1.00
0.0002591 Eth
$445,668,730.00
1,879,183.779 SOL
0.0000%
41
DigiFinex
TRX-USDT$1.00
0.0002591 Eth
$422,937,665.00
1,309,616,898.400 TRX
0.0039%
42
Bybit
DOGE-USDT$1.00
0.0002591 Eth
$416,610,402.00
947,952,715.700 DOGE
0.0029%
43
Binance
RENDER-USDT$1.00
0.0002591 Eth
$411,524,358.00
39,835,540.060 RENDER
0.0001%
44
Binance
JASMY-USDT$1.00
0.0002595 Eth
$390,409,704.00
7,561,892,374.200 JASMY
0.0228%
45
Bitunix
DOGE-USDT$1.00
0.0002591 Eth
$385,801,061.00
884,999,856.000 DOGE
0.0027%
46
OKX
XRP-USDT$1.00
0.0002591 Eth
$376,620,253.00
160,821,820.420 XRP
0.0005%
47
KuCoin
ETH-USDT$0.9997
0.0002590 Eth
$326,229,949.00
84,453.039 ETH
0.0000%
48
DigiFinex
DOGE-USDT$1.00
0.0002591 Eth
$318,463,219.00
730,715,379.140 DOGE
0.0022%
49
Binance
SAND-USDT$0.9998
0.0002590 Eth
$298,539,399.00
324,101,963.000 SAND
0.0010%
50
HTX
ETH-USDT$1.00
0.0002591 Eth
$264,512,132.00
68,272.480 ETH
0.0000%
51
Gate.io
PEPE-USDT$1.00
0.0002591 Eth
$251,821,556.00
11,621,265,097,019.000 PEPE
35.0206%
52
Bitunix
SOL-USDT$1.00
0.0002591 Eth
$248,505,750.00
1,025,316.614 SOL
0.0000%
53
Binance
ACT-USDT$1.00
0.0002591 Eth
$245,502,418.00
415,860,798.200 ACT
0.0013%
54
Binance
AVAX-USDT$1.00
0.0002591 Eth
$242,419,596.00
4,683,242.780 AVAX
0.0000%
55
OKX
SUI-USDT$1.00
0.0002591 Eth
$242,377,944.00
59,261,199.815 SUI
0.0002%
56
HTX
DOGE-USDT$1.00
0.0002591 Eth
$234,919,691.00
533,838,142.660 DOGE
0.0016%
57
Gate.io
SOL-USDT$0.9997
0.0002590 Eth
$225,936,516.00
954,026.428 SOL
0.0000%
58
Binance
FTM-USDT$1.002
0.0002595 Eth
$219,719,974.00
172,234,818.000 FTM
0.0005%
59
Binance
NEAR-USDT$0.9998
0.0002590 Eth
$219,708,190.00
28,466,262.800 NEAR
0.0001%
60
Toobit
XRP-USDT$1.001
0.0002592 Eth
$219,480,075.00
93,635,545.000 XRP
0.0003%
61
Binance
NEIRO-USDT$1.001
0.0002594 Eth
$214,351,632.00
120,053,495,520.000 NEIRO
0.3618%
62
LBank
SOL-USDT$1.00
0.0002591 Eth
$201,728,717.00
832,626.402 SOL
0.0000%
63
OrangeX
DOGE-USDT$1.00
0.0002591 Eth
$199,616,869.00
453,390,964.000 DOGE
0.0014%
64
Bybit
MNT-USDT$1.00
0.0002591 Eth
$198,504,309.00
181,458,105.330 MNT
0.0005%
65
Gate.io
ONDO-USDT$1.00
0.0002591 Eth
$196,037,316.00
112,783,358.550 ONDO
0.0003%
66
KuCoin
XRP-USDT$0.9997
0.0002590 Eth
$193,784,881.00
83,308,579.435 XRP
0.0003%
67
Bitget
SOL-USDT$1.00
0.0002591 Eth
$192,486,837.00
810,275.269 SOL
0.0000%
68
Binance
ENA-USDT$1.00
0.0002591 Eth
$189,399,184.00
199,120,419.650 ENA
0.0006%
69
Fastex
BTC-USDT$0.9997
0.0002590 Eth
$185,583,357.00
1,897.304 BTC
0.0000%
70
Binance
FIL-USDT$1.00
0.0002591 Eth
$181,471,250.00
22,871,781.100 FIL
0.0001%
71
Gate.io
SUI-USDT$1.00
0.0002591 Eth
$180,722,318.00
44,093,058.590 SUI
0.0001%
72
Gate.io
JASMY-USDT$1.00
0.0002591 Eth
$176,272,375.00
3,448,386,640.561 JASMY
0.0104%
73
KuCoin
SOL-USDT$0.9997
0.0002590 Eth
$166,953,424.00
688,526.322 SOL
0.0000%
74
Gate.io
HBAR-USDT$0.9997
0.0002590 Eth
$164,662,445.00
557,166,396.410 HBAR
0.0017%
75
Binance
TAO-USDT$1.001
0.0002596 Eth
$162,851,267.00
236,384.671 TAO
0.0000%
76
Binance
SEI-USDT$1.00
0.0002591 Eth
$161,080,873.00
229,800,364.100 SEI
0.0007%
77
Binance
RUNE-USDT$1.00
0.0002591 Eth
$159,612,915.00
22,520,495.400 RUNE
0.0001%
78
Ourbit
XRP-USDT$1.001
0.0002595 Eth
$158,008,522.00
67,410,652.660 XRP
0.0002%
79
DigiFinex
SOL-USDT$1.00
0.0002591 Eth
$156,169,461.00
644,130.200 SOL
0.0000%
80
Binance
UNI-USDT$0.9998
0.0002590 Eth
$152,037,055.00
9,862,683.390 UNI
0.0000%
81
LBank
DOGE-USDT$1.00
0.0002591 Eth
$148,525,036.00
340,689,750.000 DOGE
0.0010%
82
DigiFinex
SUI-USDT$1.00
0.0002591 Eth
$146,085,312.00
34,084,976.400 SUI
0.0001%
83
Binance
VET-USDT$1.00
0.0002595 Eth
$129,672,124.00
1,879,058,546.000 VET
0.0057%
84
OKX
SHIB-USDT$1.00
0.0002591 Eth
$126,554,206.00
4,023,005,087,740.000 SHIB
12.1233%
85
Binance
EOS-USDT$1.001
0.0002596 Eth
$124,150,683.00
89,913,359.900 EOS
0.0003%
86
BingX
BTC-USDT$1.00
0.0002591 Eth
$123,556,425.00
1,227.445 BTC
0.0000%
87
KuCoin
DOGE-USDT$0.9997
0.0002590 Eth
$123,435,297.00
283,573,018.335 DOGE
0.0009%
88
WhiteBIT
TRX-USDT$1.001
0.0002592 Eth
$121,559,386.00
377,574,742.970 TRX
0.0011%
89
Gate.io
LTC-USDT$0.9997
0.0002590 Eth
$116,771,835.00
853,753.987 LTC
0.0000%
90
Kraken
BTC-USDT$1.001
0.0002592 Eth
$114,291,692.00
1,167.784 BTC
0.0000%
91
Gate.io
TAO-USDT$1.00
0.0002591 Eth
$109,079,634.00
158,697.460 TAO
0.0000%
92
Binance
FLOKI-USDT$1.00
0.0002591 Eth
$106,176,715.00
450,677,151,732.000 FLOKI
1.3581%
93
DigiFinex
XRP-USDT$1.00
0.0002591 Eth
$104,068,052.00
44,672,661.000 XRP
0.0001%
94
Bitunix
USDC-USDT$1.00
0.0002591 Eth
$101,918,006.00
101,935,430.316 USDC
0.0003%
95
DigiFinex
USDC-USDT$1.00
0.0002591 Eth
$101,282,453.00
101,309,800.000 USDC
0.0003%
96
BingX
ETH-USDT$1.00
0.0002591 Eth
$99,418,277.00
25,683.015 ETH
0.0000%
97
WhiteBIT
NEAR-USDT$1.00
0.0002595 Eth
$95,811,561.00
11,934,996.370 NEAR
0.0000%
98
OKX
USDC-USDT$1.00
0.0002591 Eth
$91,996,756.00
92,057,359.666 USDC
0.0003%
99
Deepcoin
USDC-USDT$0.9997
0.0002590 Eth
$87,285,299.00
92,045,976.960 USDC
0.0003%
100
Bitget
USDC-USDT$1.00
0.0002591 Eth
$60,966,701.00
60,999,692.543 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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