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IERC20PermitUpgradeable

Interface 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.

Methods

DOMAIN_SEPARATOR

function DOMAIN_SEPARATOR() external view returns (bytes32)

Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.

Returns

NameTypeDescription
_0bytes32undefined

nonces

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

Returns the current nonce for owner. This value must be included whenever a signature is generated for {permit}. Every successful call to {permit} increases owner's nonce by one. This prevents a signature from being used multiple times.

Parameters

NameTypeDescription
owneraddressundefined

Returns

NameTypeDescription
_0uint256undefined

permit

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

Sets value as the allowance of spender over owner's tokens, given owner's signed approval. IMPORTANT: The same issues {IERC20-approve} has related to transaction ordering also apply here. Emits an {Approval} event. Requirements: - spender cannot be the zero address. - deadline must be a timestamp in the future. - v, r and s must be a valid secp256k1 signature from owner over the EIP712-formatted function arguments. - the signature must use owner's current nonce (see {nonces}). For more information on the signature format, see the https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP section].

Parameters

NameTypeDescription
owneraddressundefined
spenderaddressundefined
valueuint256undefined
deadlineuint256undefined
vuint8undefined
rbytes32undefined
sbytes32undefined