ETH Price: $2,213.85 (+1.91%)

Token

Tether USD (USDT)
 

Overview

Max Total Supply

75,918,584,460.692261 USDT

Holders

6,992,281 ( 0.094%)

Market

Price

$1.00 @ 0.000452 ETH

Onchain Market Cap

$75,906,968,917.27

Circulating Supply Market Cap

$142,473,850,283.00

Other Info

Token Contract (WITH 6 Decimals)

Balance
0 USDT

Value
$0.00
0x27fc5ca1a262aa31f2d0a80a9d00443346944375
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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):$82,610,197,610.00
Market Capitalization:$142,473,850,283.00
Circulating Supply:142,495,395,119.00 USDT
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.001
0.0004527 Eth
$3,822,005,615.00
43,108.335 BTC
0.0007%
2
OrangeX
BTC-USDT$0.9992
0.0004517 Eth
$2,076,537,825.00
23,477.733 BTC
0.0004%
3
Crypto.com Exchange
BTC-USDT$1.001
0.0004527 Eth
$1,744,583,555.00
19,450.431 BTC
0.0003%
4
Binance
ETH-USDT$0.9999
0.0004521 Eth
$1,727,997,531.00
787,348.111 ETH
0.0127%
5
OKX
BTC-USDT$1.001
0.0004527 Eth
$1,340,945,611.00
15,125.802 BTC
0.0002%
6
CoinW
BTC-USDT$0.9999
0.0004521 Eth
$1,288,308,782.00
14,357.524 BTC
0.0002%
7
BitMart
BTC-USDT$0.9999
0.0004527 Eth
$1,240,807,237.00
13,850.575 BTC
0.0002%
8
Bitget
BTC-USDT$0.9999
0.0004521 Eth
$1,079,848,600.00
12,185.752 BTC
0.0002%
9
MEXC
BTC-USDT$0.9998
0.0004513 Eth
$1,056,489,359.00
11,770.679 BTC
0.0002%
10
Bybit
BTC-USDT$1.00
0.0004528 Eth
$1,041,834,221.00
11,764.180 BTC
0.0002%
11
DigiFinex
BTC-USDT$1.001
0.0004527 Eth
$982,374,812.00
10,941.237 BTC
0.0002%
12
Crypto.com Exchange
ETH-USDT$1.00
0.0004528 Eth
$963,525,956.00
435,383.625 ETH
0.0070%
13
Toobit
BTC-USDT$1.001
0.0004527 Eth
$933,939,111.00
10,538.094 BTC
0.0002%
14
AscendEX (BitMax)
BTC-USDT$1.001
0.0004527 Eth
$931,030,966.00
10,362.908 BTC
0.0002%
15
WhiteBIT
BTC-USDT$1.001
0.0004527 Eth
$927,058,040.00
10,320.574 BTC
0.0002%
16
Binance
SOL-USDT$0.9999
0.0004521 Eth
$846,824,031.00
5,872,711.028 SOL
0.0947%
17
Gate.io
BTC-USDT$0.9999
0.0004521 Eth
$793,631,176.00
8,931.621 BTC
0.0001%
18
XT.COM
BTC-USDT$1.001
0.0004527 Eth
$764,384,308.00
8,621.404 BTC
0.0001%
19
Binance
XRP-USDT$0.9999
0.0004521 Eth
$731,449,488.00
295,593,922.000 XRP
4.7659%
20
Binance
ADA-USDT$0.9999
0.0004521 Eth
$716,937,275.00
749,081,660.500 ADA
12.0775%
21
MEXC
ETH-USDT$1.00
0.0004528 Eth
$612,029,813.00
276,859.373 ETH
0.0045%
22
Hotcoin
BTC-USDT$1.00
0.0004528 Eth
$598,261,321.00
6,662.033 BTC
0.0001%
23
Bitunix
BTC-USDT$0.9992
0.0004517 Eth
$569,179,611.00
6,342.728 BTC
0.0001%
24
HTX
BTC-USDT$1.001
0.0004527 Eth
$516,583,802.00
5,829.458 BTC
0.0001%
25
Toobit
ETH-USDT$1.001
0.0004527 Eth
$515,721,460.00
234,738.974 ETH
0.0038%
26
AscendEX (BitMax)
ETH-USDT$1.001
0.0004527 Eth
$511,834,692.00
231,009.521 ETH
0.0037%
27
Gate.io
ETH-USDT$0.9999
0.0004521 Eth
$499,898,602.00
227,527.263 ETH
0.0037%
28
BVOX
ETH-USDT$1.00
0.0004512 Eth
$488,660,829.00
222,733.044 ETH
0.0036%
29
OKX
ETH-USDT$1.001
0.0004527 Eth
$443,036,732.00
201,639.949 ETH
0.0033%
30
BigONE
BTC-USDT$0.9997
0.0004510 Eth
$441,882,260.00
4,921.081 BTC
0.0001%
31
BitMart
ETH-USDT$0.9999
0.0004527 Eth
$421,764,497.00
190,861.695 ETH
0.0031%
32
Coinbase Exchange
USDT-USD$0.9999
0.0004521 Eth
$405,377,470.00
405,418,011.890 USDT
6.5366%
33
Bitget
ETH-USDT$0.9999
0.0004521 Eth
$399,543,376.00
181,984.361 ETH
0.0029%
34
CoinW
ETH-USDT$1.00
0.0004528 Eth
$385,591,030.00
174,399.706 ETH
0.0028%
35
XT.COM
ETH-USDT$1.001
0.0004527 Eth
$343,456,807.00
156,289.643 ETH
0.0025%
36
Gate.io
PI-USDT$0.9999
0.0004521 Eth
$336,265,703.00
178,739,220.173 PI
2.8818%
37
OrangeX
ETH-USDT$0.9998
0.0004513 Eth
$333,061,892.00
151,880.314 ETH
0.0024%
38
LBank
BTC-USDT$0.9999
0.0004527 Eth
$320,275,338.00
3,574.774 BTC
0.0001%
39
P2B
ETH-USDT$0.9998
0.0004511 Eth
$315,602,716.00
142,284.312 ETH
0.0023%
40
KuCoin
BTC-USDT$0.9999
0.0004521 Eth
$288,215,125.00
3,214.185 BTC
0.0001%
41
Bitget
BGB-USDT$0.9999
0.0004521 Eth
$262,135,638.00
60,041,225.466 BGB
0.9680%
42
Bybit
ETH-USDT$1.00
0.0004528 Eth
$252,444,132.00
114,990.465 ETH
0.0019%
43
DigiFinex
ETH-USDT$1.001
0.0004527 Eth
$249,450,773.00
112,640.622 ETH
0.0018%
44
Bitget
PI-USDT$1.00
0.0004528 Eth
$225,543,132.00
120,038,235.800 PI
1.9354%
45
WhiteBIT
ETH-USDT$1.001
0.0004527 Eth
$221,737,539.00
100,108.199 ETH
0.0016%
46
Binance
DOGE-USDT$0.9997
0.0004518 Eth
$221,495,373.00
1,103,956,068.000 DOGE
17.7991%
47
Hotcoin
ETH-USDT$0.9998
0.0004511 Eth
$202,338,107.00
91,256.193 ETH
0.0015%
48
OKX
PI-USDT$1.001
0.0004527 Eth
$201,805,114.00
107,289,908.456 PI
1.7298%
49
Coinbase Exchange
USDT-USDC$1.001
0.0004528 Eth
$199,951,200.00
199,680,343.150 USDT
3.2195%
50
OKX
SOL-USDT$1.001
0.0004527 Eth
$198,790,878.00
1,377,576.807 SOL
0.0222%
51
Binance
SUI-USDT$0.9999
0.0004521 Eth
$197,671,230.00
78,318,829.200 SUI
1.2627%
52
Ourbit
ETH-USDT$0.9999
0.0004527 Eth
$196,841,239.00
89,679.932 ETH
0.0014%
53
Bitget
SOL-USDT$0.9999
0.0004521 Eth
$193,537,741.00
1,341,275.343 SOL
0.0216%
54
Coinstore
ETH-USDT$0.9994
0.0004526 Eth
$193,372,111.00
88,194.427 ETH
0.0014%
55
Bybit
SOL-USDT$1.00
0.0004528 Eth
$192,153,485.00
1,333,408.440 SOL
0.0215%
56
Bybit
XRP-USDT$1.00
0.0004528 Eth
$189,112,269.00
76,340,563.930 XRP
1.2308%
57
OrangeX
ADA-USDT$1.00
0.0004517 Eth
$185,032,908.00
193,608,448.300 ADA
3.1216%
58
Bitunix
ETH-USDT$0.9992
0.0004517 Eth
$184,668,952.00
83,446.750 ETH
0.0013%
59
Hibt
BTC-USDT$0.9998
0.0004513 Eth
$181,880,967.00
2,054.480 BTC
0.0000%
60
Binance
KAITO-USDT$0.9998
0.0004511 Eth
$181,742,320.00
98,186,952.400 KAITO
1.5831%
61
P2B
ADA-USDT$0.9998
0.0004511 Eth
$177,877,541.00
179,985,607.700 ADA
2.9019%
62
Bitget
XRP-USDT$0.9999
0.0004521 Eth
$176,739,117.00
71,387,714.860 XRP
1.1510%
63
BYDFi
BTC-USDT$0.9979
0.0004506 Eth
$169,694,350.00
1,894.219 BTC
0.0000%
64
Gate.io
XRP-USDT$0.9999
0.0004521 Eth
$161,522,229.00
65,301,077.112 XRP
1.0529%
65
Coinstore
BTC-USDT$1.00
0.0004512 Eth
$160,421,376.00
1,815.373 BTC
0.0000%
66
OKX
ADA-USDT$1.001
0.0004527 Eth
$150,874,609.00
157,239,291.332 ADA
2.5352%
67
Bybit
USDC-USDT$1.00
0.0004528 Eth
$146,258,712.00
146,251,641.400 USDC
2.3580%
68
Biconomy.com
ETH-USDT$1.001
0.0004527 Eth
$143,353,799.00
65,282.647 ETH
0.0011%
69
DigiFinex
ADA-USDT$1.001
0.0004527 Eth
$141,830,895.00
143,778,113.400 ADA
2.3181%
70
LBank
ETH-USDT$0.9982
0.0004505 Eth
$140,925,686.00
63,648.519 ETH
0.0010%
71
KuCoin
ETH-USDT$0.9999
0.0004521 Eth
$138,231,543.00
62,499.687 ETH
0.0010%
72
Binance
BNB-USDT$0.9999
0.0004527 Eth
$138,184,261.00
233,537.756 BNB
0.0038%
73
Bitrue
BTC-USDT$0.9982
0.0004505 Eth
$134,513,659.00
1,501.012 BTC
0.0000%
74
Kraken
USDT-USD$0.9999
0.0004521 Eth
$134,363,215.00
134,379,340.608 USDT
2.1666%
75
Binance
BCH-USDT$0.9999
0.0004521 Eth
$130,565,925.00
355,367.320 BCH
0.0057%
76
BTSE
BTC-USDT$1.00
0.0004527 Eth
$130,191,197.00
1,453.067 BTC
0.0000%
77
Dex-Trade
BTC-USDT$0.9999
0.0004519 Eth
$129,308,188.00
1,436.437 BTC
0.0000%
78
Binance
HBAR-USDT$0.9999
0.0004521 Eth
$116,071,095.00
464,615,813.000 HBAR
7.4910%
79
Bitget
ADA-USDT$0.9999
0.0004521 Eth
$112,224,778.00
117,409,699.035 ADA
1.8930%
80
Binance
LTC-USDT$0.9999
0.0004521 Eth
$111,191,794.00
1,075,177.279 LTC
0.0173%
81
WEEX
SOL-USDT$1.00
0.0004517 Eth
$110,941,218.00
770,445.728 SOL
0.0124%
82
KuCoin
XRP-USDT$0.9999
0.0004521 Eth
$107,829,681.00
43,075,630.833 XRP
0.6945%
83
OKX
XRP-USDT$1.001
0.0004527 Eth
$107,616,182.00
43,414,203.107 XRP
0.7000%
84
Gate.io
SOL-USDT$0.9999
0.0004521 Eth
$101,867,662.00
706,852.548 SOL
0.0114%
85
CoinEx
BTC-USDT$0.9998
0.0004533 Eth
$100,885,448.00
1,139.410 BTC
0.0000%
86
OKX
TRUMP-USDT$1.001
0.0004527 Eth
$100,175,624.00
7,635,220.132 TRUMP
0.1231%
87
OKX
DOGE-USDT$1.001
0.0004527 Eth
$96,857,788.00
481,508,692.535 DOGE
7.7634%
88
Binance
AAVE-USDT$0.9999
0.0004533 Eth
$95,852,519.00
448,612.725 AAVE
0.0072%
89
Hibt
ETH-USDT$0.9999
0.0004527 Eth
$92,949,712.00
42,351.472 ETH
0.0007%
90
Binance
S-USDT$1.00
0.0004528 Eth
$92,179,155.00
159,793,750.800 S
2.5764%
91
Coinbase Exchange
BTC-USDT$1.001
0.0004527 Eth
$89,678,082.00
998.235 BTC
0.0000%
92
LBank
SOL-USDT$1.00
0.0004512 Eth
$72,822,370.00
499,414.913 SOL
0.0081%
93
DigiFinex
SOL-USDT$0.9999
0.0004521 Eth
$68,866,968.00
474,979.220 SOL
0.0077%
94
LBank
ADA-USDT$1.00
0.0004512 Eth
$56,288,277.00
56,979,516.700 ADA
0.9187%
95
Bitrue
ETH-USDT$0.9998
0.0004539 Eth
$53,942,034.00
24,485.263 ETH
0.0004%
96
PointPay
BTC-USDT$1.00
0.0004518 Eth
$49,516,631.00
559.380 BTC
0.0000%
97
KuCoin
SOL-USDT$0.9999
0.0004521 Eth
$49,045,008.00
338,264.218 SOL
0.0055%
98
HTX
DOGE-USDT$1.001
0.0004527 Eth
$48,899,158.00
243,598,456.200 DOGE
3.9276%
99
Azbit
BTC-USDT$0.9979
0.0004506 Eth
$48,631,949.00
550.705 BTC
0.0000%
100
BingX
BTC-USDT$1.00
0.0004528 Eth
$32,623,196.00
369.178 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

API
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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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