Tether USD

0xdac17f958d2ee523a2206206994597c13d831ec7 Copy

ERC20

This contract is an ERC20 token.

Name Tether USD

Symbol USDT

Decimals 6

Total Supply 6,877,479,172 USDT

About

Tether (USDT) is a cryptocurrency launched in 2015and operates on the Ethereum platform. Tether has a current supply of 64,469,767,616.826355 with 62,019,248,695.48168 in circulation. The last known price of Tether is 1.0002193 USD and is up 0.03 over the last 24 hours. It is currently trading on 14455 active market(s) with $46,171,067,305.95 traded over the last 24 hours. More information can be found at https://tether.to.

Stats

Public Functions 18

Event Types 11

Code Size 14,888 bytes

Events (11)

AddedBlackList Event

Parameters

_user

address

Approval Event

Parameters

owner	address
spender	address
value	uint

Deprecate Event

Parameters

newAddress

address

DestroyedBlackFunds Event

Parameters

_blackListedUser	address
_balance	uint

Issue Event

Parameters

amount

uint

Params Event

Parameters

feeBasisPoints	uint
maxFee	uint

Pause Event

Parameters

Redeem Event

Parameters

amount

uint

RemovedBlackList Event

Parameters

_user

address

Transfer Event

Parameters

from	address
to	address
value	uint

Unpause Event

Parameters

Constants (1)

MAX_UINT Constant

uint

UNKNOWN VALUE - 1

State Variables (13)

name Variable

string

symbol Variable

string

decimals Variable

uint

upgradedAddress Variable

address

deprecated Variable

bool

paused Variable

bool

owner Variable

address

basisPointsRate Variable

uint

maximumFee Variable

uint

_totalSupply Variable

uint

balances Variable

mapping(address => uint)

isBlackListed Variable

mapping(address => bool)

allowed Variable

mapping(address => mapping(address => uint))

Internal Variable

Functions Expand All Collapse All

totalSupply

Parameters

This function has no parameters.

Properties

Visibility public

Mutability constant

Source Code

function totalSupply() public constant returns (uint256) {
  if (deprecated) {
    return StandardToken(upgradedAddress).totalSupply();
  } else {
    return _totalSupply;
  }
}

balanceOf

Parameters

Name	Type
who	address

Properties

Visibility public

Mutability constant

Source Code

function balanceOf(address who) public constant returns (uint256) {
  if (deprecated) {
    return UpgradedStandardToken(upgradedAddress).balanceOf(who);
  } else {
    return super.balanceOf(who);
  }
}

transfer

Parameters

Name	Type
_to	address
_value	uint

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Requirements

isBlackListed for the sender's address must not be true

Source Code

function transfer(address _to, uint256 _value) public whenNotPaused {
  require(!isBlackListed[msg.sender]);
  if (deprecated) {
    return
      UpgradedStandardToken(upgradedAddress).transferByLegacy(
        msg.sender,
        _to,
        _value
      );
  } else {
    return super.transfer(_to, _value);
  }
}

transferOwnership

Parameters

Name	Type
newOwner	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function transferOwnership(address newOwner) public onlyOwner {
  if (newOwner != address(0)) {
    owner = newOwner;
  }
}

getBlackListStatus

Parameters

Name	Type
_maker	address

Properties

Visibility public

Mutability constant

Source Code

function getBlackListStatus(address _maker) external constant returns (bool) {
  return isBlackListed[_maker];
}

getOwner

Parameters

This function has no parameters.

Properties

Visibility public

Mutability constant

Source Code

function getOwner() external constant returns (address) {
  return owner;
}

addBlackList

Parameters

Name	Type
_evilUser	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function addBlackList(address _evilUser) public onlyOwner {
  isBlackListed[_evilUser] = true;
  AddedBlackList(_evilUser);
}

removeBlackList

Parameters

Name	Type
_clearedUser	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function removeBlackList(address _clearedUser) public onlyOwner {
  isBlackListed[_clearedUser] = false;
  RemovedBlackList(_clearedUser);
}

destroyBlackFunds

Parameters

Name	Type
_blackListedUser	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function destroyBlackFunds(address _blackListedUser) public onlyOwner {
  require(isBlackListed[_blackListedUser]);
  uint256 dirtyFunds = balanceOf(_blackListedUser);
  balances[_blackListedUser] = 0;
  _totalSupply -= dirtyFunds;
  DestroyedBlackFunds(_blackListedUser, dirtyFunds);
}

allowance

Parameters

Name	Type
_owner	address
_spender	address

Properties

Visibility public

Mutability constant

Source Code

function allowance(address _owner, address _spender)
  public
  constant
  returns (uint256 remaining)
{
  if (deprecated) {
    return StandardToken(upgradedAddress).allowance(_owner, _spender);
  } else {
    return super.allowance(_owner, _spender);
  }
}

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Requirements

isBlackListed for _from must not be true

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) public whenNotPaused {
  require(!isBlackListed[_from]);
  if (deprecated) {
    return
      UpgradedStandardToken(upgradedAddress).transferFromByLegacy(
        msg.sender,
        _from,
        _to,
        _value
      );
  } else {
    return super.transferFrom(_from, _to, _value);
  }
}

approve

Parameters

Name	Type
_spender	address
_value	uint

Properties

Visibility public

Mutability transaction

Modifiers

onlyPayloadSize checks for the following:

UNKNOWN VALUE must not be true

Source Code

function approve(address _spender, uint256 _value)
  public
  onlyPayloadSize(2 * 32)
{
  if (deprecated) {
    return
      UpgradedStandardToken(upgradedAddress).approveByLegacy(
        msg.sender,
        _spender,
        _value
      );
  } else {
    return super.approve(_spender, _value);
  }
}

pause

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

whenNotPaused checks for the following:

paused must not be true

Source Code

function pause() public onlyOwner whenNotPaused {
  paused = true;
  Pause();
}

unpause

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

whenPaused checks for the following:

paused must be true

Source Code

function unpause() public onlyOwner whenPaused {
  paused = false;
  Unpause();
}

deprecate

Parameters

Name	Type
_upgradedAddress	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function deprecate(address _upgradedAddress) public onlyOwner {
  deprecated = true;
  upgradedAddress = _upgradedAddress;
  Deprecate(_upgradedAddress);
}

issue

Parameters

Name	Type
amount	uint

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Requirements

_totalSupply must be less than _totalSupply + amount

balances for owner + amount must be greater than balances for owner

Source Code

function issue(uint256 amount) public onlyOwner {
  require(_totalSupply + amount > _totalSupply);
  require(balances[owner] + amount > balances[owner]);

  balances[owner] += amount;
  _totalSupply += amount;
  Issue(amount);
}

redeem

Parameters

Name	Type
amount	uint

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Requirements

_totalSupply must be greater than or equal to amount

amount must be less than or equal to balances for owner

Source Code

function redeem(uint256 amount) public onlyOwner {
  require(_totalSupply >= amount);
  require(balances[owner] >= amount);

  _totalSupply -= amount;
  balances[owner] -= amount;
  Redeem(amount);
}

setParams

Parameters

Name	Type
newBasisPoints	uint
newMaxFee	uint

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Requirements

newBasisPoints must be less than 20

newMaxFee must be less than 50

Source Code

function setParams(uint256 newBasisPoints, uint256 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);
}

Internal Functions Expand All Collapse All

Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.

Tether USD

ERC20

About link description

Stats

Events (11) keyboard_arrow_up

AddedBlackList Event

Parameters help Event parameters list the data that an event contains.

Approval Event

Parameters help Event parameters list the data that an event contains.

Deprecate Event

Parameters help Event parameters list the data that an event contains.

DestroyedBlackFunds Event

Parameters help Event parameters list the data that an event contains.

Issue Event

Parameters help Event parameters list the data that an event contains.

Params Event

Parameters help Event parameters list the data that an event contains.

Pause Event

Parameters help Event parameters list the data that an event contains.

Redeem Event

Parameters help Event parameters list the data that an event contains.

RemovedBlackList Event

Parameters help Event parameters list the data that an event contains.

Transfer Event

Parameters help Event parameters list the data that an event contains.

Unpause Event

Parameters help Event parameters list the data that an event contains.

Constants (1) keyboard_arrow_up

MAX_UINT Constant

State Variables (13) keyboard_arrow_up

name Variable

symbol Variable

decimals Variable

upgradedAddress Variable

deprecated Variable

paused Variable

owner Variable

basisPointsRate Variable

maximumFee Variable

_totalSupply Variable

balances Variable

isBlackListed Variable

allowed Variable

Functions Expand All Collapse All

totalSupply keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

balanceOf keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

transfer keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

whenNotPaused checks for the following:

Requirements help Requirements are checks that the function makes when it runs, and give you insight on what conditions are required for the function to succeed.

Source Code

transferOwnership keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

onlyOwner checks for the following:

Source Code

getBlackListStatus keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

getOwner keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

addBlackList keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

onlyOwner checks for the following:

Source Code

removeBlackList keyboard_arrow_up

About

Events (11)

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Constants (1)

State Variables (13)

totalSupply

Parameters

balanceOf

Parameters

transfer

Parameters

Modifiers

Requirements

transferOwnership

Parameters

Modifiers

getBlackListStatus

Parameters

getOwner

Parameters

addBlackList

Parameters

Modifiers

removeBlackList

Parameters

Modifiers

destroyBlackFunds

Parameters

Modifiers

allowance

Parameters

transferFrom

Parameters

Modifiers

Requirements

approve

Parameters

Modifiers

pause

Parameters

Modifiers

unpause

Parameters

Modifiers

deprecate

Parameters

Modifiers

issue

Parameters

Modifiers

Requirements

redeem

Parameters

Modifiers

Requirements

setParams

Parameters

Modifiers

Requirements