Feature request: allow Safe Apps to take msg.value from Safe signer instead of Safe itself

[PaulRBerg]

Problem

There are apps like Sablier who monetize by charging ETH fees via msg.value.

By default, a Safe tx tries to take msg.value from the Safe address itself, not from the signer who executes the tx.

The problem is that few Safes keep ETH in their multisigs, which makes monetization difficult (our assumption was that the account paying the gas for the tx would be the same account who is debited via msg.value, but this is not true for Safes).

As a workaround, we ended up adding this warning in the Sablier UI:

Solution

Allow Safe Apps to take msg.value from Safe signer instead of the Safe itself.