How to create forwarder wallet in Ethereum?

Question

I have more than one ETH wallet. I want to automatically combine these wallets into one wallet. For example, when I get an ETH in wallet 0x1, I want it to automatically transfer it to wallet 0x2. Can I do this with a smart contract? Or how can I do it? Can you help me?

Answer 1

You can use a simple contract with a payable fallback function for this. For example:

pragma solidity 0.7.0;

contract Forwarder {
  address payable owner;
    
  constructor (address payable _owner)  {
    owner = _owner;
  }
  
  fallback () external payable {
    owner.transfer(msg.value);
  }
}

Every time ETH is sent to the contract, the fallback function is called, which forwards the ETH (msg.value) to owner.

Answer 2

You can do it using a forwarder wallet, you instruct your user to transfer to an address which will automatically transfer inbound funds to a parent/central wallet.

Here's a project i created doing the same: https://github.com/farirat/solidity-forwarder-wallet

Run the tests and you will get the complete workflow.