Fetch

0x1d287cc25dad7ccaf76a26bc660c5f7c8e2a05bd Copy

ERC20

This contract is an ERC20 token.

Name Fetch

Symbol FET

Decimals 18

Total Supply 1,152,997,575 FET

About

Stats

Public Functions 27

Event Types 10

Code Size 27,350 bytes

Events (10)

Approval Event

Parameters

owner	address
spender	address
value	uint256

Burned Event

Parameters

burner	address
burnedAmount	uint

Minted Event

Parameters

receiver	address
amount	uint

MintingAgentChanged Event

Parameters

addr	address
state	bool

OwnerReclaim Event

Parameters

fromWhom	address
amount	uint

OwnershipTransferred Event

Parameters

previousOwner	address
newOwner	address

Transfer Event

Parameters

from	address
to	address
value	uint256

UpdatedTokenInformation Event

Parameters

newName	string
newSymbol	string

Upgrade Event

Parameters

_from	address
_to	address
_value	uint256

UpgradeAgentSet Event

Parameters

agent

address

Constants (1)

BURN_ADDRESS Constant

address

State Variables (15)

owner Variable

address

name Variable

string

symbol Variable

string

decimals Variable

uint

releaseAgent Variable

address

released Variable

bool

mintingFinished Variable

bool

upgradeMaster Variable

address

upgradeAgent Variable

address

totalUpgraded Variable

uint256

transferAgents Variable

mapping(address => bool)

mintAgents Variable

mapping(address => bool)

allowed Variable

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

Internal Variable

balances Variable

mapping(address => uint256)

Internal Variable

totalSupply_ Variable

uint256

Internal Variable

Functions Expand All Collapse All

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

Requirements

newOwner must not be equal to UNKNOWN VALUE

Source Code

function transferOwnership(address newOwner) public onlyOwner {
  require(newOwner != address(0));
  OwnershipTransferred(owner, newOwner);
  owner = newOwner;
}

recoverTokens

Parameters

Name	Type
token	ERC20Basic

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function recoverTokens(ERC20Basic token) public onlyOwner {
  token.transfer(owner, tokensToBeReturned(token));
}

tokensToBeReturned

Parameters

Name	Type
token	ERC20Basic

Properties

Visibility public

Mutability transaction

Source Code

function tokensToBeReturned(ERC20Basic token) public returns (uint256) {
  return token.balanceOf(this);
}

totalSupply

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function totalSupply() public view returns (uint256) {
  return totalSupply_;
}

balanceOf

Parameters

Name	Type
_owner	address

Properties

Visibility public

Mutability view

Source Code

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

transfer

Parameters

Name	Type
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Requirements

_to must not be equal to UNKNOWN VALUE

_value must be less than or equal to balances for the sender's address

Source Code

function transfer(address _to, uint256 _value) public returns (bool) {
  require(_to != address(0));
  require(_value <= balances[msg.sender]);

  // SafeMath.sub will throw if there is not enough balance.
  balances[msg.sender] = balances[msg.sender].sub(_value);
  balances[_to] = balances[_to].add(_value);
  Transfer(msg.sender, _to, _value);
  return true;
}

allowance

Parameters

Name	Type
_owner	address
_spender	address

Properties

Visibility public

Mutability view

Source Code

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

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Requirements

_to must not be equal to UNKNOWN VALUE

_value must be less than or equal to balances for _from

_value must be less than or equal to allowed for _from for the sender's address

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) public returns (bool) {
  require(_to != address(0));
  require(_value <= balances[_from]);
  require(_value <= allowed[_from][msg.sender]);

  balances[_from] = balances[_from].sub(_value);
  balances[_to] = balances[_to].add(_value);
  allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
  Transfer(_from, _to, _value);
  return true;
}

approve

Parameters

Name	Type
_spender	address
_value	uint256

Properties

Visibility public

Mutability transaction

Source Code

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

increaseApproval

Parameters

Name	Type
_spender	address
_addedValue	uint

Properties

Visibility public

Mutability transaction

Source Code

function increaseApproval(address _spender, uint256 _addedValue)
  public
  returns (bool)
{
  allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(
    _addedValue
  );
  Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
  return true;
}

decreaseApproval

Parameters

Name	Type
_spender	address
_subtractedValue	uint

Properties

Visibility public

Mutability transaction

Source Code

function decreaseApproval(address _spender, uint256 _subtractedValue)
  public
  returns (bool)
{
  uint256 oldValue = allowed[msg.sender][_spender];
  if (_subtractedValue > oldValue) {
    allowed[msg.sender][_spender] = 0;
  } else {
    allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
  }
  Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
  return true;
}

isToken

Parameters

This function has no parameters.

Properties

Visibility public

Mutability constant

Source Code

function isToken() public constant returns (bool weAre) {
  return true;
}

upgrade

Parameters

Name	Type
value	uint256

Properties

Visibility public

Mutability transaction

Requirements

UNKNOWN VALUE must not be true

value must not be equal to 0

Source Code

function upgrade(uint256 value) public {
  UpgradeState state = getUpgradeState();
  if (
    !(state == UpgradeState.ReadyToUpgrade || state == UpgradeState.Upgrading)
  ) {
    // Called in a bad state
    throw;
  }

  // Validate input value.
  if (value == 0) throw;

  balances[msg.sender] = balances[msg.sender].sub(value);

  // Take tokens out from circulation
  totalSupply_ = totalSupply_.sub(value);
  totalUpgraded = totalUpgraded.add(value);

  // Upgrade agent reissues the tokens
  upgradeAgent.upgradeFrom(msg.sender, value);
  Upgrade(msg.sender, upgradeAgent, value);
}

setUpgradeAgent

Parameters

Name	Type
agent	address

Properties

Visibility public

Mutability transaction

Requirements

the result of calling canUpgrade must not be true

agent must not be equal to 0x0

upgradeMaster must be equal to the sender's address

the result of calling getUpgradeState must not be equal to UpgradeState.Upgrading

the result of calling undefined must not be true

totalSupply_ must be equal to UNKNOWN VALUE

Source Code

function setUpgradeAgent(address agent) external {
  if (!canUpgrade()) {
    // The token is not yet in a state that we could think upgrading
    throw;
  }

  if (agent == 0x0) throw;
  // Only a master can designate the next agent
  if (msg.sender != upgradeMaster) throw;
  // Upgrade has already begun for an agent
  if (getUpgradeState() == UpgradeState.Upgrading) throw;

  upgradeAgent = UpgradeAgent(agent);

  // Bad interface
  if (!upgradeAgent.isUpgradeAgent()) throw;
  // Make sure that token supplies match in source and target
  if (upgradeAgent.originalSupply() != totalSupply_) throw;

  UpgradeAgentSet(upgradeAgent);
}

getUpgradeState

Parameters

This function has no parameters.

Properties

Visibility public

Mutability constant

Source Code

function getUpgradeState() public constant returns (UpgradeState) {
  if (!canUpgrade()) return UpgradeState.NotAllowed;
  else if (address(upgradeAgent) == 0x00) return UpgradeState.WaitingForAgent;
  else if (totalUpgraded == 0) return UpgradeState.ReadyToUpgrade;
  else return UpgradeState.Upgrading;
}

setUpgradeMaster

Parameters

Name	Type
master	address

Properties

Visibility public

Mutability transaction

Requirements

master must not be equal to 0x0

upgradeMaster must be equal to the sender's address

Source Code

function setUpgradeMaster(address master) public {
  if (master == 0x0) throw;
  if (msg.sender != upgradeMaster) throw;
  upgradeMaster = master;
}

canUpgrade

Parameters

This function has no parameters.

Properties

Visibility public

Mutability constant

Source Code

function canUpgrade() public constant returns (bool) {
  return released && super.canUpgrade();
}

mint

Parameters

Name	Type
receiver	address
amount	uint

Properties

Visibility public

Mutability transaction

Modifiers

onlyMintAgent checks for the following:

mintAgents for the sender's address must not be true

canMint checks for the following:

mintingFinished must not be true

Source Code

function mint(address receiver, uint256 amount) public onlyMintAgent canMint {
  totalSupply_ = totalSupply_.plus(amount);
  balances[receiver] = balances[receiver].plus(amount);

  // This will make the mint transaction apper in EtherScan.io
  // We can remove this after there is a standardized minting event
  Transfer(0, receiver, amount);
}

setMintAgent

Parameters

Name	Type
addr	address
state	bool

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

canMint checks for the following:

mintingFinished must not be true

Source Code

function setMintAgent(address addr, bool state) public onlyOwner canMint {
  mintAgents[addr] = state;
  MintingAgentChanged(addr, state);
}

setReleaseAgent

Parameters

Name	Type
addr	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

inReleaseState checks for the following:

released must be equal to false

Source Code

function setReleaseAgent(address addr) public onlyOwner inReleaseState(false) {
  // We don't do interface check here as we might want to a normal wallet address to act as a release agent
  releaseAgent = addr;
}

setTransferAgent

Parameters

Name	Type
addr	address
state	bool

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

inReleaseState checks for the following:

released must be equal to false

Source Code

function setTransferAgent(address addr, bool state)
  public
  onlyOwner
  inReleaseState(false)
{
  transferAgents[addr] = state;
}

releaseTokenTransfer

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyReleaseAgent checks for the following:

releaseAgent must be equal to the sender's address

Source Code

function releaseTokenTransfer() public onlyReleaseAgent {
  mintingFinished = true;
  super.releaseTokenTransfer();
}

transfer

Parameters

Name	Type
_to	address
_value	uint

Properties

Visibility public

Mutability transaction

Modifiers

canTransfer checks for the following:

Requirements

_to must not be equal to UNKNOWN VALUE

_value must be less than or equal to balances for the sender's address

Source Code

function transfer(address _to, uint256 _value)
  canTransfer(msg.sender)
  returns (bool success)
{
  // Call StandardToken.transfer()
  return super.transfer(_to, _value);
}

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint

Properties

Visibility public

Mutability transaction

Modifiers

canTransfer checks for the following:

Requirements

_to must not be equal to UNKNOWN VALUE

_value must be less than or equal to balances for _from

_value must be less than or equal to allowed for _from for the sender's address

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) canTransfer(_from) returns (bool success) {
  // Call StandardToken.transferForm()
  return super.transferFrom(_from, _to, _value);
}

setTokenInformation

Parameters

Name	Type
_name	string
_symbol	string

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function setTokenInformation(string _name, string _symbol) onlyOwner {
  name = _name;
  symbol = _symbol;

  UpdatedTokenInformation(name, symbol);
}

burn

Parameters

Name	Type
burnAmount	uint

Properties

Visibility public

Mutability transaction

Source Code

function burn(uint256 burnAmount) {
  address burner = msg.sender;
  balances[burner] = balances[burner].sub(burnAmount);
  totalSupply_ = totalSupply_.sub(burnAmount);
  Burned(burner, burnAmount);

  // Inform the blockchain explores that track the
  // balances only by a transfer event that the balance in this
  // address has decreased
  Transfer(burner, BURN_ADDRESS, burnAmount);
}

transferToOwner

Parameters

Name	Type
fromWhom	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function transferToOwner(address fromWhom) onlyOwner {
  if (released) revert();

  uint256 amount = balanceOf(fromWhom);
  balances[fromWhom] = balances[fromWhom].sub(amount);
  balances[owner] = balances[owner].add(amount);
  Transfer(fromWhom, owner, amount);
  OwnerReclaim(fromWhom, amount);
}

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.

Fetch

ERC20

About

Stats

Events (10) keyboard_arrow_up

Approval Event

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

Burned Event

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

Minted Event

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

MintingAgentChanged Event

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

OwnerReclaim Event

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

OwnershipTransferred 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.

UpdatedTokenInformation Event

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

Upgrade Event

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

UpgradeAgentSet Event

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

Constants (1) keyboard_arrow_up

BURN_ADDRESS Constant

State Variables (15) keyboard_arrow_up

owner Variable

name Variable

symbol Variable

decimals Variable

releaseAgent Variable

released Variable

mintingFinished Variable

upgradeMaster Variable

upgradeAgent Variable

totalUpgraded Variable

transferAgents Variable

mintAgents Variable

allowed Variable

balances Variable

totalSupply_ Variable

Functions Expand All Collapse All

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:

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

recoverTokens 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

tokensToBeReturned 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

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

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

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

transferFrom keyboard_arrow_up

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

Events (10)

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Constants (1)

State Variables (15)

transferOwnership

Parameters

Modifiers

Requirements

recoverTokens

Parameters

Modifiers

tokensToBeReturned

Parameters

totalSupply

Parameters

balanceOf

Parameters

transfer

Parameters

Requirements

allowance

Parameters

transferFrom

Parameters

Requirements

approve

Parameters

increaseApproval

Parameters

decreaseApproval

Parameters

isToken

Parameters

upgrade

Parameters

Requirements

setUpgradeAgent

Parameters

Requirements

getUpgradeState

Parameters

setUpgradeMaster

Parameters

Requirements

canUpgrade

Parameters

mint

Parameters

Modifiers

setMintAgent

Parameters

Modifiers

setReleaseAgent

Parameters

Modifiers

setTransferAgent

Parameters

Modifiers