Discussion for adding permit to ERC20:
Some devs are working on permit() implementation for wETH based on @albertocuestacanada work from OZ reference. Would be fantastic to get extra eyes and think through pushing a std. permit() reference in OZ library. 
Onward to crush gas costs!
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Hi @Ro5s,
It would be great to have a standard permit for ERC-20.
EIP-3009 is also a possibility to consider:
We want to provide permit in OZ Contracts, but the EIP remains in Draft status and we have a policy of not publishing Drafts because they could need breaking changes in the future.
Do you know if anyone is working on moving the EIP to Final?
Edit: ERC20Permit is now a part of OpenZeppelin Contract.
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A post was split to a new topic: Why is ERC20Permit better than approve/transferFrom?
A post was split to a new topic: ERC20Permit + SignatureChecker