Could I use my wallet to pay gas fee for other wallet?

[Haianh9999]

Describe the Feature

Pay gas fee

Code Example

No response

[Haianh9999]

@ricmoo Could you help me?
For example I have 2 wallets (A and B), can I pay the transaction fee of wallet B through wallet A? 🙇

[Haianh9999]

Note: I have the private keys of both of these wallets

[mentasuave01]

No, you can't. But instead, you could do a simple transfer.
If you want to do a feeless operation, you can use signature method.
Here is a great example https://medium.com/coinmonks/how-to-implement-gas-less-transactions-on-ethereum-9f9273d2f059

[zemse]

Depends on what kind of tx you wanna do.

For ERC20 or ERC721 transfers, if the token contract supports permit function (2612), any address can pay gas for these transfers. You can refer to the article shared by mentasuave01 above.

For ETH transfers (or any kind of general tx), there's no way until EIPS like 2938 which allows contract to pay gas after checks pass or 3074 which allows any address to pay for gas. These things are under discussion and it's uncertain if/when they'd make it to core ethereum protocol.

However, you may explore using smart wallets, especially EIP-4337 which abstracts tx as a UserOp, which is submitted to an alternate mempool and a bundler includes it in their batch. Tx fees can be paid using ERC20 tokens or even sponsored by someone else or even your custom conditions can be coded into the paymaster smart contract.

(I'm moving this thread into discussions)