ERC20Permit

Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't need to send a transaction, and thus is not required to hold Ether at all. Available since v3.4.

Methods

DOMAIN_SEPARATOR

function DOMAIN_SEPARATOR() external view returns (bytes32)

See {IERC20Permit-DOMAIN_SEPARATOR}.

Returns

NameTypeDescription

_0

bytes32

undefined

allowance

function allowance(address owner, address spender) external view returns (uint256)

See {IERC20-allowance}.

Parameters

NameTypeDescription

owner

address

undefined

spender

address

undefined

Returns

NameTypeDescription

_0

uint256

undefined

approve

function approve(address spender, uint256 amount) external nonpayable returns (bool)

See {IERC20-approve}. Requirements: - spender cannot be the zero address.

Parameters

NameTypeDescription

spender

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

balanceOf

function balanceOf(address account) external view returns (uint256)

See {IERC20-balanceOf}.

Parameters

NameTypeDescription

account

address

undefined

Returns

NameTypeDescription

_0

uint256

undefined

decimals

function decimals() external view returns (uint8)

Returns the number of decimals used to get its user representation. For example, if decimals equals 2, a balance of 505 tokens should be displayed to a user as 5,05 (505 / 10 ** 2). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. NOTE: This information is only used for display purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}.

Returns

NameTypeDescription

_0

uint8

undefined

decreaseAllowance

function decreaseAllowance(address spender, uint256 subtractedValue) external nonpayable returns (bool)

Atomically decreases the allowance granted to spender by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - spender cannot be the zero address. - spender must have allowance for the caller of at least subtractedValue.

Parameters

NameTypeDescription

spender

address

undefined

subtractedValue

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

increaseAllowance

function increaseAllowance(address spender, uint256 addedValue) external nonpayable returns (bool)

Atomically increases the allowance granted to spender by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - spender cannot be the zero address.

Parameters

NameTypeDescription

spender

address

undefined

addedValue

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

name

function name() external view returns (string)

Returns the name of the token.

Returns

NameTypeDescription

_0

string

undefined

nonces

function nonces(address owner) external view returns (uint256)

See {IERC20Permit-nonces}.

Parameters

NameTypeDescription

owner

address

undefined

Returns

NameTypeDescription

_0

uint256

undefined

permit

function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external nonpayable

See {IERC20Permit-permit}.

Parameters

NameTypeDescription

owner

address

undefined

spender

address

undefined

value

uint256

undefined

deadline

uint256

undefined

v

uint8

undefined

r

bytes32

undefined

s

bytes32

undefined

symbol

function symbol() external view returns (string)

Returns the symbol of the token, usually a shorter version of the name.

Returns

NameTypeDescription

_0

string

undefined

totalSupply

function totalSupply() external view returns (uint256)

See {IERC20-totalSupply}.

Returns

NameTypeDescription

_0

uint256

undefined

transfer

function transfer(address recipient, uint256 amount) external nonpayable returns (bool)

See {IERC20-transfer}. Requirements: - recipient cannot be the zero address. - the caller must have a balance of at least amount.

Parameters

NameTypeDescription

recipient

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

transferFrom

function transferFrom(address sender, address recipient, uint256 amount) external nonpayable returns (bool)

See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. Requirements: - sender and recipient cannot be the zero address. - sender must have a balance of at least amount. - the caller must have allowance for sender's tokens of at least amount.

Parameters

NameTypeDescription

sender

address

undefined

recipient

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

Events

Approval

event Approval(address indexed owner, address indexed spender, uint256 value)

Parameters

NameTypeDescription

owner indexed

address

undefined

spender indexed

address

undefined

value

uint256

undefined

Transfer

event Transfer(address indexed from, address indexed to, uint256 value)

Parameters

NameTypeDescription

from indexed

address

undefined

to indexed

address

undefined

value

uint256

undefined

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