I've been using this Xapo wallet for last few days and I'm impressed. Would this not be a solution for all faucets? I don't know what needs to be done to implement it to a faucet but I know it literally sends payment straight to the users Xapo wallet which eliminates the need for the user to reach minimum payout. I've seen a few faucets with this service and they are pushing it hard so it must be a cost effective solution for them.