# IERC20PermitAllowed

Interface for permit

Interface used by DAI/CHAI for permit

## Functions

### permit

`function permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s) external` external

Approve the spender to spend some tokens via the holder signature *Developer note: This is the permit interface used by DAI and CHAI*

| Name    | Type    | Description                                                                       |
| ------- | ------- | --------------------------------------------------------------------------------- |
| holder  | address | The address of the token holder, the token owner                                  |
| spender | address | The address of the token spender                                                  |
| nonce   | uint256 | The holder's nonce, increases at each call to permit                              |
| expiry  | uint256 | The timestamp at which the permit is no longer valid                              |
| allowed | bool    | Boolean that sets approval amount, true for type(uint256).max and false for 0     |
| v       | uint8   | Must produce valid secp256k1 signature from the holder along with \`r\` and \`s\` |
| r       | bytes32 | Must produce valid secp256k1 signature from the holder along with \`v\` and \`s\` |
| s       | bytes32 | Must produce valid secp256k1 signature from the holder along with \`r\` and \`v\` |


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