Blockwell

yearn.finance

ERC20

This contract is an ERC20 token.

Name yearn.finance
Symbol YFI
Decimals 18
Total Supply 30,000 YFI

About link

yearn.finance (YFI) is a cryptocurrency and operates on the Ethereum platform. yearn.finance has a current supply of 36,666 with 36,635.43982673 in circulation. The last known price of yearn.finance is 28,962.60922654 USD and is down -4.03 over the last 24 hours. It is currently trading on 227 active market(s) with $292,591,384.85 traded over the last 24 hours. More information can be found at https://yearn.finance/.

Stats

Public Functions 15
Event Types 2
Code Size 8,522 bytes

Library Use

Uses SafeERC20 for IERC20.
Uses Address for address.
Uses SafeMath for uint.

Events (2) keyboard_arrow_up

Approval Event

Parameters help
owner
address help
spender
address help
value
uint help

Transfer Event

Parameters help
from
address help
to
address help
value
uint help

governance Variable

address help

minters Variable

mapping(address => bool) help

_balances Variable

mapping(address => uint) help
Internal Variable

_allowances Variable

mapping(address => mapping(address => uint)) help
Internal Variable

_totalSupply Variable

uint help
Internal Variable

_name Variable

string help
Internal Variable

_symbol Variable

string help
Internal Variable

_decimals Variable

uint8 help
Internal Variable

Functions Expand All Collapse All

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
function name() public view returns (string memory) {
  return _name;
}

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
function symbol() public view returns (string memory) {
  return _symbol;
}

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
function decimals() public view returns (uint8) {
  return _decimals;
}

Parameters help

This function has no parameters.

Properties

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

Parameters help

Name Type
account
address help

Properties

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

Parameters help

Name Type
recipient
address help
amount
uint help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
function transfer(address recipient, uint256 amount) public returns (bool) {
  _transfer(_msgSender(), recipient, amount);
  return true;
}

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 _allowances[owner][spender];
}

Parameters help

Name Type
spender
address help
amount
uint help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
function approve(address spender, uint256 amount) public returns (bool) {
  _approve(_msgSender(), spender, amount);
  return true;
}

Parameters help

Name Type
sender
address help
recipient
address help
amount
uint help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
function transferFrom(
  address sender,
  address recipient,
  uint256 amount
) public returns (bool) {
  _transfer(sender, recipient, amount);
  _approve(
    sender,
    _msgSender(),
    _allowances[sender][_msgSender()].sub(
      amount,
      "ERC20: transfer amount exceeds allowance"
    )
  );
  return true;
}

Parameters help

Name Type
spender
address help
addedValue
uint help

Properties

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Requirements help

Source Code
function increaseAllowance(address spender, uint256 addedValue)
  public
  returns (bool)
{
  _approve(
    _msgSender(),
    spender,
    _allowances[_msgSender()][spender].add(addedValue)
  );
  return true;
}

Parameters help

Name Type
spender
address help
subtractedValue
uint help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
function decreaseAllowance(address spender, uint256 subtractedValue)
  public
  returns (bool)
{
  _approve(
    _msgSender(),
    spender,
    _allowances[_msgSender()][spender].sub(
      subtractedValue,
      "ERC20: decreased allowance below zero"
    )
  );
  return true;
}

Parameters help

Name Type
account
address help
amount
uint help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
function mint(address account, uint256 amount) public {
  require(minters[msg.sender], "!minter");
  _mint(account, amount);
}

Parameters help

Name Type
_governance
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function setGovernance(address _governance) public {
  require(msg.sender == governance, "!governance");
  governance = _governance;
}

Parameters help

Name Type
_minter
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function addMinter(address _minter) public {
  require(msg.sender == governance, "!governance");
  minters[_minter] = true;
}

Parameters help

Name Type
_minter
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function removeMinter(address _minter) public {
  require(msg.sender == governance, "!governance");
  minters[_minter] = false;
}

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 ERC20._transfer keyboard_arrow_up

Parameters help

Name Type
sender
address help
recipient
address help
amount
uint help

Properties

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Requirements help

Source Code
function _transfer(
  address sender,
  address recipient,
  uint256 amount
) internal {
  require(sender != address(0), "ERC20: transfer from the zero address");
  require(recipient != address(0), "ERC20: transfer to the zero address");

  _balances[sender] = _balances[sender].sub(
    amount,
    "ERC20: transfer amount exceeds balance"
  );
  _balances[recipient] = _balances[recipient].add(amount);
  emit Transfer(sender, recipient, amount);
}

internal ERC20._mint keyboard_arrow_up

Parameters help

Name Type
account
address help
amount
uint help

Properties

Visibility help internal
Mutability help transaction

Requirements help

Source Code
function _mint(address account, uint256 amount) internal {
  require(account != address(0), "ERC20: mint to the zero address");

  _totalSupply = _totalSupply.add(amount);
  _balances[account] = _balances[account].add(amount);
  emit Transfer(address(0), account, amount);
}

internal ERC20._burn keyboard_arrow_up

Parameters help

Name Type
account
address help
amount
uint help

Properties

Visibility help internal
Mutability help transaction

Requirements help

Source Code
function _burn(address account, uint256 amount) internal {
  require(account != address(0), "ERC20: burn from the zero address");

  _balances[account] = _balances[account].sub(
    amount,
    "ERC20: burn amount exceeds balance"
  );
  _totalSupply = _totalSupply.sub(amount);
  emit Transfer(account, address(0), amount);
}

internal ERC20._approve keyboard_arrow_up

Parameters help

Name Type
owner
address help
spender
address help
amount
uint help

Properties

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Mutability help transaction

Requirements help

Source Code
function _approve(
  address owner,
  address spender,
  uint256 amount
) internal {
  require(owner != address(0), "ERC20: approve from the zero address");
  require(spender != address(0), "ERC20: approve to the zero address");

  _allowances[owner][spender] = amount;
  emit Approval(owner, spender, amount);
}

internal Context.constructor keyboard_arrow_up

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This function has no parameters.

Properties

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Source Code
constructor() internal {}

internal Context._msgSender keyboard_arrow_up

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This function has no parameters.

Properties

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Mutability help view
Source Code
function _msgSender() internal view returns (address payable) {
  return msg.sender;
}