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Documentation Index

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Interface used by DAI/CHAI for permit

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Functions

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permit

  function permit(
    address holder,
    address spender,
    uint256 nonce,
    uint256 expiry,
    bool allowed,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external
Approve the spender to spend some tokens via the holder signature This is the permit interface used by DAI and CHAI

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Parameters:

NameTypeDescription
holderaddressThe address of the token holder, the token owner
spenderaddressThe address of the token spender
nonceuint256The holder’s nonce, increases at each call to permit
expiryuint256The timestamp at which the permit is no longer valid
allowedboolBoolean that sets approval amount, true for type(uint256).max and false for 0
vuint8Must produce valid secp256k1 signature from the holder along with r and s
rbytes32Must produce valid secp256k1 signature from the holder along with v and s
sbytes32Must produce valid secp256k1 signature from the holder along with r and v