[can16358p]

There might be a smart contract that acts as a hot wallet where you fund once to authorize, and every month the contract owner/operator can withdraw X amount of Ether from your quota. They pay for the gas but if L2 is used and transactions are batched, that's negligible.

If your quota has insufficient Ether or you've deauthorized the contract, your "subscription" will be cancelled automatically.

All on-chain. This should be the way to go.

[TimJRobinson]

Yea there's many that do this. https://www.gelato.network is one.