Basic Attention Token

0x0d8775f648430679a709e98d2b0cb6250d2887ef Copy

ERC20

This contract is an ERC20 token.

Name Basic Attention Token

Symbol BAT

Decimals 18

Total Supply 1,500,000,000 BAT

About

Basic Attention Token (BAT) is a cryptocurrency and operates on the Ethereum platform. Basic Attention Token has a current supply of 1,500,000,000 with 1,488,387,172.9673505 in circulation. The last known price of Basic Attention Token is 0.55297698 USD and is up 9.11 over the last 24 hours. It is currently trading on 247 active market(s) with $229,894,841.08 traded over the last 24 hours. More information can be found at https://basicattentiontoken.org/.

Stats

Public Functions 8

Event Types 4

Code Size 6,902 bytes

Events (4)

Approval Event

Parameters

_owner	address
_spender	address
_value	uint256

CreateBAT Event

Parameters

_to	address
_value	uint256

LogRefund Event

Parameters

_to	address
_value	uint256

Transfer Event

Parameters

_from	address
_to	address
_value	uint256

Constants (7)

name Constant

string

Basic Attention Token

symbol Constant

string

BAT

decimals Constant

uint256

batFund Constant

uint256

500 * UNKNOWN VALUE * UNKNOWN VALUE

tokenExchangeRate Constant

uint256

6400

tokenCreationCap Constant

uint256

1500 * UNKNOWN VALUE * UNKNOWN VALUE

tokenCreationMin Constant

uint256

675 * UNKNOWN VALUE * UNKNOWN VALUE

State Variables (9)

version Variable

string

ethFundDeposit Variable

address

batFundDeposit Variable

address

isFinalized Variable

bool

fundingStartBlock Variable

uint256

fundingEndBlock Variable

uint256

totalSupply Variable

uint256

balances Variable

mapping(address => uint256)

Internal Variable

allowed Variable

mapping(address => mapping(address => uint256))

Internal Variable

Functions Expand All Collapse All

balanceOf

Parameters

Name	Type
_owner	address

Properties

Visibility public

Mutability constant

Source Code

function balanceOf(address _owner) constant returns (uint256 balance) {
  return balances[_owner];
}

transfer

Parameters

Name	Type
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Source Code

function transfer(address _to, uint256 _value) returns (bool success) {
  if (balances[msg.sender] >= _value && _value > 0) {
    balances[msg.sender] -= _value;
    balances[_to] += _value;
    Transfer(msg.sender, _to, _value);
    return true;
  } else {
    return false;
  }
}

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) returns (bool success) {
  if (
    balances[_from] >= _value &&
    allowed[_from][msg.sender] >= _value &&
    _value > 0
  ) {
    balances[_to] += _value;
    balances[_from] -= _value;
    allowed[_from][msg.sender] -= _value;
    Transfer(_from, _to, _value);
    return true;
  } else {
    return false;
  }
}

approve

Parameters

Name	Type
_spender	address
_value	uint256

Properties

Visibility public

Mutability transaction

Source Code

function approve(address _spender, uint256 _value) returns (bool success) {
  allowed[msg.sender][_spender] = _value;
  Approval(msg.sender, _spender, _value);
  return true;
}

allowance

Parameters

Name	Type
_owner	address
_spender	address

Properties

Visibility public

Mutability constant

Source Code

function allowance(address _owner, address _spender)
  constant
  returns (uint256 remaining)
{
  return allowed[_owner][_spender];
}

createTokens

Parameters

This function has no parameters.

Properties

Visibility public

Mutability payable

Requirements

isFinalized must not be true

fundingStartBlock must be less than or equal to block.number

fundingEndBlock must be greater than or equal to block.number

msg.value must not be equal to 0

tokenCreationCap must be greater than or equal to checkedSupply

Source Code

function createTokens() external payable {
  if (isFinalized) throw;
  if (block.number < fundingStartBlock) throw;
  if (block.number > fundingEndBlock) throw;
  if (msg.value == 0) throw;

  uint256 tokens = safeMult(msg.value, tokenExchangeRate); // check that we're not over totals
  uint256 checkedSupply = safeAdd(totalSupply, tokens);

  // return money if something goes wrong
  if (tokenCreationCap < checkedSupply) throw; // odd fractions won't be found

  totalSupply = checkedSupply;
  balances[msg.sender] += tokens; // safeAdd not needed; bad semantics to use here
  CreateBAT(msg.sender, tokens); // logs token creation
}

finalize

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Requirements

isFinalized must not be true

ethFundDeposit must be equal to the sender's address

totalSupply must be greater than or equal to tokenCreationMin

One or more of the following: - totalSupply must be equal to tokenCreationCap - OR fundingEndBlock must be less than block.number

the result of calling undefined with this.balance must not be true

Source Code

function finalize() external {
  if (isFinalized) throw;
  if (msg.sender != ethFundDeposit) throw; // locks finalize to the ultimate ETH owner
  if (totalSupply < tokenCreationMin) throw; // have to sell minimum to move to operational
  if (block.number <= fundingEndBlock && totalSupply != tokenCreationCap) throw;
  // move to operational
  isFinalized = true;
  if (!ethFundDeposit.send(this.balance)) throw; // send the eth to Brave International
}

refund

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Requirements

isFinalized must not be true

fundingEndBlock must be less than block.number

totalSupply must be less than tokenCreationMin

batFundDeposit must not be equal to the sender's address

batVal must not be equal to 0

the result of calling undefined with ethVal must not be true

Source Code

function refund() external {
  if (isFinalized) throw; // prevents refund if operational
  if (block.number <= fundingEndBlock) throw; // prevents refund until sale period is over
  if (totalSupply >= tokenCreationMin) throw; // no refunds if we sold enough
  if (msg.sender == batFundDeposit) throw; // Brave Intl not entitled to a refund
  uint256 batVal = balances[msg.sender];
  if (batVal == 0) throw;
  balances[msg.sender] = 0;
  totalSupply = safeSubtract(totalSupply, batVal); // extra safe
  uint256 ethVal = batVal / tokenExchangeRate; // should be safe; previous throws covers edges
  LogRefund(msg.sender, ethVal); // log it
  if (!msg.sender.send(ethVal)) throw; // if you're using a contract; make sure it works with .send gas limits
}

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.

internal SafeMath.safeAdd

Parameters

Name	Type
x	uint256
y	uint256

Properties

Visibility internal

Mutability transaction

Source Code

function safeAdd(uint256 x, uint256 y) internal returns (uint256) {
  uint256 z = x + y;
  assert((z >= x) && (z >= y));
  return z;
}

internal SafeMath.safeSubtract

Parameters

Name	Type
x	uint256
y	uint256

Properties

Visibility internal

Mutability transaction

Requirements

x must be greater than or equal to y

Source Code

function safeSubtract(uint256 x, uint256 y) internal returns (uint256) {
  assert(x >= y);
  uint256 z = x - y;
  return z;
}

internal SafeMath.safeMult

Parameters

Name	Type
x	uint256
y	uint256

Properties

Visibility internal

Mutability transaction

Requirements

One or more of the following:

Source Code

function safeMult(uint256 x, uint256 y) internal returns (uint256) {
  uint256 z = x * y;
  assert((x == 0) || (z / x == y));
  return z;
}

Basic Attention Token

ERC20

About link description

Stats

Events (4) keyboard_arrow_up

Approval Event

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

CreateBAT Event

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

LogRefund 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.

Constants (7) keyboard_arrow_up

name Constant

symbol Constant

decimals Constant

batFund Constant

tokenExchangeRate Constant

tokenCreationCap Constant

tokenCreationMin Constant

State Variables (9) keyboard_arrow_up

version Variable

ethFundDeposit Variable

batFundDeposit Variable

isFinalized Variable

fundingStartBlock Variable

fundingEndBlock Variable

totalSupply Variable

balances Variable

allowed Variable

Functions Expand All Collapse All

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

Source Code

transferFrom 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

approve 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

allowance 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

createTokens keyboard_arrow_up

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

Properties

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

finalize keyboard_arrow_up

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

Properties

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

refund keyboard_arrow_up

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

Properties

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

Internal Functions Expand All Collapse All

internal SafeMath.safeAdd 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

internal SafeMath.safeSubtract keyboard_arrow_up

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

Properties

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

internal SafeMath.safeMult keyboard_arrow_up

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

Properties

About

Events (4)

Parameters

Parameters

Parameters

Parameters

Constants (7)

State Variables (9)

balanceOf

Parameters

transfer

Parameters

transferFrom

Parameters

approve

Parameters

allowance

Parameters

createTokens

Parameters

Requirements

finalize

Parameters

Requirements

refund

Parameters

Requirements

internal SafeMath.safeAdd

Parameters

internal SafeMath.safeSubtract

Parameters

Requirements

internal SafeMath.safeMult

Parameters

Requirements