ETH Price: $2,479.63 (-0.62%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

76,918,584,460.692261 USDT

Holders

6,932,490 (0.00%)

Market

Price

$1.00 @ 0.000403 ETH (-0.12%)

Onchain Market Cap

$76,810,898,442.45

Circulating Supply Market Cap

$141,904,872,976.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0xc8bfa71b7b0339143426fb6a892d9b82032355d8
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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):$72,320,974,909.00
Market Capitalization:$141,904,872,976.00
Circulating Supply:142,104,224,084.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$0.9983
0.0004022 Eth
$6,563,136,723.00
74,151.296 BTC
0.0005%
2
OrangeX
BTC-USDT$0.9985
0.0004025 Eth
$5,484,383,254.00
62,063.341 BTC
0.0004%
3
FameEX
BTC-USDT$0.9985
0.0004025 Eth
$5,376,775,050.00
60,727.596 BTC
0.0004%
4
Pionex
BTC-USDT$0.9997
0.0004028 Eth
$4,391,743,973.00
49,460.409 BTC
0.0003%
5
Ourbit
BTC-USDT$0.9983
0.0004023 Eth
$3,913,860,977.00
44,219.603 BTC
0.0003%
6
BVOX
BTC-USDT$0.9987
0.0004035 Eth
$3,465,179,007.00
39,105.707 BTC
0.0003%
7
Binance
USDC-USDT$0.9985
0.0004025 Eth
$2,956,277,078.00
2,958,969,458.000 USDC
20.1287%
8
Binance
ETH-USDT$0.9984
0.0004023 Eth
$2,928,119,265.00
1,212,081.967 ETH
0.0082%
9
Bybit
BTC-USDT$0.9983
0.0004022 Eth
$2,251,981,065.00
25,496.118 BTC
0.0002%
10
FameEX
ETH-USDT$0.9985
0.0004025 Eth
$2,196,334,318.00
909,085.385 ETH
0.0062%
11
OKX
BTC-USDT$0.9983
0.0004022 Eth
$2,194,396,007.00
24,806.777 BTC
0.0002%
12
BitMart
BTC-USDT$0.9983
0.0004022 Eth
$2,178,145,983.00
24,691.170 BTC
0.0002%
13
Toobit
BTC-USDT$0.9985
0.0004025 Eth
$2,035,275,253.00
22,980.590 BTC
0.0002%
14
Tapbit
ETH-USDT$0.9983
0.0004026 Eth
$1,939,336,810.00
802,258.801 ETH
0.0055%
15
MEXC
BTC-USDT$0.9986
0.0004028 Eth
$1,842,863,075.00
20,870.290 BTC
0.0001%
16
Crypto.com Exchange
BTC-USDT$0.9981
0.0004021 Eth
$1,692,034,694.00
19,146.353 BTC
0.0001%
17
Bitget
BTC-USDT$0.9983
0.0004022 Eth
$1,635,562,078.00
18,495.343 BTC
0.0001%
18
Pionex
ETH-USDT$0.9997
0.0004028 Eth
$1,627,205,838.00
669,849.448 ETH
0.0046%
19
Binance
XRP-USDT$0.9994
0.0004033 Eth
$1,621,468,019.00
733,961,902.000 XRP
4.9929%
20
DigiFinex
BTC-USDT$0.9983
0.0004022 Eth
$1,586,369,787.00
17,955.311 BTC
0.0001%
21
Crypto.com Exchange
ETH-USDT$0.9978
0.0004021 Eth
$1,494,374,095.00
602,771.709 ETH
0.0041%
22
Binance
SOL-USDT$0.9988
0.0004023 Eth
$1,477,217,565.00
10,637,925.970 SOL
0.0724%
23
WhiteBIT
BTC-USDT$0.9985
0.0004026 Eth
$1,430,112,718.00
16,198.050 BTC
0.0001%
24
Binance
FDUSD-USDT$0.9983
0.0004026 Eth
$1,411,897,437.00
1,414,475,675.000 FDUSD
9.6221%
25
Hotcoin
BTC-USDT$0.9983
0.0004026 Eth
$1,382,798,632.00
15,676.163 BTC
0.0001%
26
XT.COM
BTC-USDT$0.9997
0.0004028 Eth
$1,242,913,362.00
14,021.830 BTC
0.0001%
27
P2B
BTC-USDT$0.9986
0.0004035 Eth
$1,163,509,039.00
13,200.999 BTC
0.0001%
28
LATOKEN
BTC-USDT$0.9986
0.0004028 Eth
$1,146,513,994.00
12,984.187 BTC
0.0001%
29
Toobit
ETH-USDT$0.9985
0.0004035 Eth
$1,113,102,879.00
460,232.270 ETH
0.0031%
30
WEEX
ETH-USDT$0.9988
0.0004025 Eth
$1,012,273,971.00
416,967.058 ETH
0.0028%
31
Bitunix
BTC-USDT$0.9983
0.0004026 Eth
$933,873,414.00
10,588.641 BTC
0.0001%
32
AscendEX (BitMax)
BTC-USDT$0.9987
0.0004024 Eth
$919,966,949.00
10,406.347 BTC
0.0001%
33
OKX
ETH-USDT$0.9983
0.0004022 Eth
$894,348,988.00
369,681.036 ETH
0.0025%
34
BVOX
ETH-USDT$0.9987
0.0004034 Eth
$888,590,545.00
367,156.816 ETH
0.0025%
35
Gate.io
BTC-USDT$0.9983
0.0004023 Eth
$887,534,988.00
10,039.711 BTC
0.0001%
36
Ourbit
ETH-USDT$0.9984
0.0004023 Eth
$846,146,003.00
348,059.616 ETH
0.0024%
37
MEXC
ETH-USDT$0.9988
0.0004029 Eth
$788,281,413.00
317,606.765 ETH
0.0022%
38
BigONE
BTC-USDT$0.9987
0.0004035 Eth
$757,756,097.00
8,594.246 BTC
0.0001%
39
Gate.io
ETH-USDT$0.9983
0.0004023 Eth
$725,799,136.00
300,072.521 ETH
0.0020%
40
BitMart
ETH-USDT$0.9983
0.0004022 Eth
$724,448,456.00
292,513.380 ETH
0.0020%
41
Tapbit
BTC-USDT$0.9983
0.0004026 Eth
$719,162,978.00
8,121.886 BTC
0.0001%
42
Bitget
ETH-USDT$0.9983
0.0004022 Eth
$716,927,868.00
296,546.350 ETH
0.0020%
43
CoinW
ETH-USDT$0.9986
0.0004028 Eth
$673,564,512.00
271,732.296 ETH
0.0018%
44
Coinbase Exchange
USDT-USD$0.9986
0.0004023 Eth
$591,929,008.00
592,741,062.800 USDT
4.0322%
45
HTX
BTC-USDT$0.9983
0.0004022 Eth
$583,336,287.00
6,575.006 BTC
0.0000%
46
XT.COM
ETH-USDT$0.9988
0.0004029 Eth
$572,126,010.00
236,652.126 ETH
0.0016%
47
LBank
BTC-USDT$0.9986
0.0004028 Eth
$546,631,318.00
6,195.182 BTC
0.0000%
48
KuCoin
BTC-USDT$0.9983
0.0004023 Eth
$535,673,012.00
6,062.873 BTC
0.0000%
49
Binance
DOGE-USDT$0.9983
0.0004022 Eth
$523,363,475.00
2,553,414,265.000 DOGE
17.3699%
50
Binance
SUI-USDT$0.9988
0.0004023 Eth
$520,530,872.00
186,710,799.100 SUI
1.2701%
51
AscendEX (BitMax)
ETH-USDT$0.9987
0.0004024 Eth
$513,569,116.00
207,045.186 ETH
0.0014%
52
OrangeX
ETH-USDT$0.9985
0.0004025 Eth
$513,192,402.00
212,006.819 ETH
0.0014%
53
Bybit
IP-USDT$0.9983
0.0004022 Eth
$483,467,666.00
91,911,088.540 IP
0.6252%
54
WhiteBIT
ETH-USDT$0.9986
0.0004028 Eth
$476,286,800.00
192,300.609 ETH
0.0013%
55
Bybit
ETH-USDT$0.9983
0.0004022 Eth
$464,591,633.00
192,415.390 ETH
0.0013%
56
Biconomy.com
BTC-USDT$0.9983
0.0004022 Eth
$462,306,796.00
5,216.944 BTC
0.0000%
57
FameEX
SOL-USDT$0.9985
0.0004025 Eth
$448,336,527.00
3,229,648.463 SOL
0.0220%
58
Bitget
SOL-USDT$0.9983
0.0004022 Eth
$444,535,887.00
3,206,622.674 SOL
0.0218%
59
DigiFinex
ETH-USDT$0.9983
0.0004022 Eth
$427,095,359.00
172,314.514 ETH
0.0012%
60
Bitget
IP-USDT$0.9983
0.0004022 Eth
$416,617,099.00
78,992,365.260 IP
0.5374%
61
P2B
ETH-USDT$0.9996
0.0004028 Eth
$415,429,232.00
167,207.360 ETH
0.0011%
62
Bitget
BGB-USDT$0.9983
0.0004022 Eth
$404,413,670.00
93,118,886.877 BGB
0.6335%
63
LATOKEN
ETH-USDT$0.9996
0.0004028 Eth
$397,807,946.00
160,124.109 ETH
0.0011%
64
OKX
SOL-USDT$0.9983
0.0004022 Eth
$396,350,498.00
2,857,469.575 SOL
0.0194%
65
Binance
BNB-USDT$0.9984
0.0004023 Eth
$368,086,497.00
606,869.418 BNB
0.0041%
66
Hibt
BTC-USDT$0.9983
0.0004023 Eth
$339,212,332.00
3,832.810 BTC
0.0000%
67
KuCoin
ETH-USDT$0.9983
0.0004023 Eth
$331,966,531.00
133,961.848 ETH
0.0009%
68
Bitunix
ETH-USDT$0.9983
0.0004026 Eth
$321,639,161.00
129,896.709 ETH
0.0009%
69
Bitget
XRP-USDT$0.9983
0.0004022 Eth
$314,302,230.00
142,058,826.404 XRP
0.9664%
70
Bybit
XRP-USDT$0.9983
0.0004022 Eth
$294,736,092.00
133,479,004.020 XRP
0.9080%
71
Gate.io
XRP-USDT$0.9983
0.0004023 Eth
$293,577,884.00
132,823,487.480 XRP
0.9035%
72
Bybit
SOL-USDT$0.9983
0.0004022 Eth
$289,255,439.00
2,078,879.392 SOL
0.0141%
73
LBank
USDC-USDT$0.9984
0.0004023 Eth
$264,303,229.00
264,377,598.210 USDC
1.7985%
74
Kraken
USDT-USD$0.9986
0.0004023 Eth
$245,890,100.00
246,242,226.745 USDT
1.6751%
75
MEXC
USDC-USDT$0.9989
0.0004026 Eth
$240,700,103.00
240,660,778.380 USDC
1.6371%
76
Bitrue
BTC-USDT$0.9985
0.0004022 Eth
$239,522,680.00
2,712.288 BTC
0.0000%
77
Biconomy.com
ETH-USDT$0.9983
0.0004026 Eth
$232,483,474.00
95,963.237 ETH
0.0007%
78
Coinbase Exchange
USDT-USDC$0.9985
0.0004026 Eth
$225,931,441.00
226,270,790.940 USDT
1.5392%
79
OKX
XRP-USDT$0.9983
0.0004022 Eth
$217,199,686.00
98,500,178.703 XRP
0.6701%
80
Binance
LTC-USDT$0.9984
0.0004023 Eth
$210,538,505.00
1,881,621.215 LTC
0.0128%
81
OKX
DOGE-USDT$0.9983
0.0004022 Eth
$207,141,640.00
1,010,852,312.236 DOGE
6.8764%
82
Binance
S-USDT$0.9988
0.0004029 Eth
$206,263,061.00
284,068,658.900 S
1.9324%
83
Gate.io
SOL-USDT$0.9983
0.0004023 Eth
$204,960,240.00
1,477,800.157 SOL
0.0101%
84
Bitfinex
BTC-USDT$0.9979
0.0004021 Eth
$201,055,823.00
2,275.988 BTC
0.0000%
85
Binance
ADA-USDT$0.9988
0.0004029 Eth
$199,942,322.00
302,561,450.300 ADA
2.0582%
86
Bybit
USDC-USDT$0.9983
0.0004022 Eth
$194,859,897.00
195,096,289.420 USDC
1.3272%
87
HTX
ETH-USDT$0.9983
0.0004022 Eth
$189,016,024.00
78,192.621 ETH
0.0005%
88
Hibt
ETH-USDT$0.9988
0.0004028 Eth
$185,783,743.00
76,725.967 ETH
0.0005%
89
KuCoin
XRP-USDT$0.9983
0.0004023 Eth
$185,701,497.00
80,879,615.607 XRP
0.5502%
90
Dex-Trade
BTC-USDT$0.9985
0.0004026 Eth
$173,433,689.00
1,965.366 BTC
0.0000%
91
Gate.io
DOGE-USDT$0.9983
0.0004023 Eth
$169,569,422.00
828,260,875.000 DOGE
5.6343%
92
Gate.io
ONDO-USDT$0.9983
0.0004022 Eth
$152,697,799.00
159,103,103.900 ONDO
1.0823%
93
Binance
HBAR-USDT$0.9986
0.0004027 Eth
$147,347,826.00
784,560,799.000 HBAR
5.3371%
94
MEXC
DOGE-USDT$0.9986
0.0004028 Eth
$143,549,291.00
685,583,523.350 DOGE
4.6638%
95
BTSE
BTC-USDT$0.9996
0.0004028 Eth
$129,890,249.00
1,469.534 BTC
0.0000%
96
DigiFinex
USDC-USDT$0.9983
0.0004022 Eth
$129,029,808.00
129,079,072.000 USDC
0.8781%
97
DigiFinex
SOL-USDT$0.9983
0.0004022 Eth
$124,682,242.00
875,391.340 SOL
0.0060%
98
KuCoin
SOL-USDT$0.9983
0.0004023 Eth
$119,188,954.00
836,896.537 SOL
0.0057%
99
Binance
VANA-USDT$0.9983
0.0004022 Eth
$118,494,760.00
13,454,806.690 VANA
0.0915%
100
Azbit
BTC-USDT$0.9983
0.0004022 Eth
$81,212,468.00
917.801 BTC
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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