IERC20Permit
Last updated
Last updated
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.
Returns the domain separator used in the encoding of the signature for permit, as defined by {EIP712}.
| Name | Type | Description |
|---|---|---|
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.
| Name | Type | Description |
|---|---|---|
| Name | Type | Description |
|---|---|---|
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].
| Name | Type | Description |
|---|---|---|
_0
bytes32
undefined
owner
address
undefined
_0
uint256
undefined
owner
address
undefined
spender
address
undefined
value
uint256
undefined
deadline
uint256
undefined
v
uint8
undefined
r
bytes32
undefined
s
bytes32
undefined