Gasless transactions with already deployed contract

Support Contracts
1

I saw https://docs.openzeppelin.com/defender/v1/guide-metatx and https://docs.openzeppelin.com/contracts/4.x/api/metatx. Something I don't quite understand is whether I need to have implemented my contracts with this beforehand.

My use case is that I have already deployed a lot of contracts, and I now need to help my users execute those contracts and send transactions. Most of them are crypto novices and illiterate. Is it possible for me to use Metatx to let them do gasless transactions (and I would pay for the gas) even though I've already deployed the contracts?

Thanks.

2

Hey @cinjon,

A meta transaction can be achieved in two main ways:

Both cases require your contracts to have already implemented such mechanisms before deployment.
All OpenZeppelin Contracts inherit from Context and use its _msgSender() method for every msg.sender access. If you want to support metatransaction capabilities, we recommend to override the _msgSender function via inheriting from ERC2771Context instead.

Unfortunately, if you have your contracts already deployed (not upgradeable) and there's no account with special privileges that can act on others' behalf, I don't see an easy way to make a metatransactions setup.