Blockwell

Fetch

ERC20

This contract is an ERC20 token.

Name Fetch
Symbol FET
Decimals 18
Total Supply 1,152,997,575 FET

About link description

Launched in March 2018 by a team based in Cambridge, UK, Fetch.ai aims to be at the forefront of accelerating research and the deployment of emerging technologies such as blockchain and AI. Its solutions are designed for people, organizations, and IoT. The project has created an Open Economic Framework (OEF) that serves as a decentralized search and a value exchange platform for various autonomous economic agents. This is supported by a smart ledger that can reportedly support more than 30,000 transactions per second, and which is intended to meet the demands of the next generation of connected devices. Fetch.ai has digital intelligence at its heart: it aims to deliver actionable predictions, instant trust information, enable the construction of robust collaborative models, and improve efficiencies and streamlining processes.

Stats

Public Functions 27
Event Types 10
Code Size 27,350 bytes

Approval Event

Parameters help
owner
address help
spender
address help
value
uint256 help

Burned Event

Parameters help
burner
address help
burnedAmount
uint help

Minted Event

Parameters help
receiver
address help
amount
uint help

MintingAgentChanged Event

Parameters help
addr
address help
state
bool help

OwnerReclaim Event

Parameters help
fromWhom
address help
amount
uint help

OwnershipTransferred Event

Parameters help
previousOwner
address help
newOwner
address help

Transfer Event

Parameters help
from
address help
to
address help
value
uint256 help

UpdatedTokenInformation Event

Parameters help
newName
string help
newSymbol
string help

Upgrade Event

Parameters help
_from
address help
_to
address help
_value
uint256 help

UpgradeAgentSet Event

Parameters help
agent
address help

Functions Expand All Collapse All

transferOwnership keyboard_arrow_up

Parameters help

Name Type
newOwner
address help

Properties

Visibility help public
Mutability help transaction

Requirements help

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

recoverTokens keyboard_arrow_up

Parameters help

Name Type
token
ERC20Basic help

Properties

Visibility help public
Mutability help transaction
Source Code
  function recoverTokens(ERC20Basic token) onlyOwner public {
    token.transfer(owner, tokensToBeReturned(token));
  }

tokensToBeReturned keyboard_arrow_up

Parameters help

Name Type
token
ERC20Basic help

Properties

Visibility help public
Mutability help transaction
Source Code
  function tokensToBeReturned(ERC20Basic token) public returns (uint) {
    return token.balanceOf(this);
  }

totalSupply keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

balanceOf keyboard_arrow_up

Parameters help

Name Type
_owner
address help

Properties

Visibility help public
Mutability help view
Source Code
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

transfer keyboard_arrow_up

Parameters help

Name Type
_to
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction
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 keyboard_arrow_up

Parameters help

Name Type
_owner
address help
_spender
address help

Properties

Visibility help public
Mutability help view
Source Code
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

transferFrom keyboard_arrow_up

Parameters help

Name Type
_from
address help
_to
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction

Requirements help

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 keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_value
uint256 help

Properties

Visibility help public
Mutability help 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 keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_addedValue
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
  function increaseApproval(address _spender, uint _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 keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_subtractedValue
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint 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 keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help constant
Source Code
  function isToken() public constant returns (bool weAre) {
    return true;
  }

upgrade keyboard_arrow_up

Parameters help

Name Type
value
uint256 help

Properties

Visibility help public
Mutability help transaction

Requirements help

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 keyboard_arrow_up

Parameters help

Name Type
agent
address help

Properties

Visibility help public
Mutability help transaction
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 keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help 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 keyboard_arrow_up

Parameters help

Name Type
master
address help

Properties

Visibility help public
Mutability help transaction
Source Code
  function setUpgradeMaster(address master) public {
      if (master == 0x0) throw;
      if (msg.sender != upgradeMaster) throw;
      upgradeMaster = master;
  }

canUpgrade keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help constant
Source Code
  function canUpgrade() public constant returns(bool) {
    return released && super.canUpgrade();
  }

mint keyboard_arrow_up

Parameters help

Name Type
receiver
address help
amount
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
  function mint(address receiver, uint amount) onlyMintAgent canMint public {
    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 keyboard_arrow_up

Parameters help

Name Type
addr
address help
state
bool help

Properties

Visibility help public
Mutability help transaction
Source Code
  function setMintAgent(address addr, bool state) onlyOwner canMint public {
    mintAgents[addr] = state;
    MintingAgentChanged(addr, state);
  }

setReleaseAgent keyboard_arrow_up

Parameters help

Name Type
addr
address help

Properties

Visibility help public
Mutability help transaction
Source Code
  function setReleaseAgent(address addr) onlyOwner inReleaseState(false) public {

    // 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 keyboard_arrow_up

Parameters help

Name Type
addr
address help
state
bool help

Properties

Visibility help public
Mutability help transaction
Source Code
  function setTransferAgent(address addr, bool state) onlyOwner inReleaseState(false) public {
    transferAgents[addr] = state;
  }

releaseTokenTransfer keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help transaction
Source Code
  function releaseTokenTransfer() public onlyReleaseAgent {
    mintingFinished = true;
    super.releaseTokenTransfer();
  }

transfer keyboard_arrow_up

Parameters help

Name Type
_to
address help
_value
uint help

Properties

Visibility help public
Mutability help transaction

Modifiers help

canTransfer checks for the following:
Source Code
  function transfer(address _to, uint _value) canTransfer(msg.sender) returns (bool success) {
    // Call StandardToken.transfer()
   return super.transfer(_to, _value);
  }

transferFrom keyboard_arrow_up

Parameters help

Name Type
_from
address help
_to
address help
_value
uint help

Properties

Visibility help public
Mutability help transaction

Modifiers help

canTransfer checks for the following:

Requirements help

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

setTokenInformation keyboard_arrow_up

Parameters help

Name Type
_name
string help
_symbol
string help

Properties

Visibility help public
Mutability help transaction
Source Code
  function setTokenInformation(string _name, string _symbol) onlyOwner {
    name = _name;
    symbol = _symbol;

    UpdatedTokenInformation(name, symbol);
  }

burn keyboard_arrow_up

Parameters help

Name Type
burnAmount
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
  function burn(uint 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 keyboard_arrow_up

Parameters help

Name Type
fromWhom
address help

Properties

Visibility help public
Mutability help transaction
Source Code
  function transferToOwner(address fromWhom) onlyOwner {
    if (released) revert();

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