Is it possible to reduce the amount of gas for transferring ether to multi accounts via smart contract?

Question

I want to transfer the same amount of ether to 100 different addresses. I'd like to reduce the amount of gas for it.

I tried to do it with such contract:

contract MultiTransfer {

  function transferEther(uint amount, address[] users) public payable {
    require(amount * users.length == msg.value);
    for (uint i = 0; i < users.length; i++) {
      users[i].transfer(amount);
    }
  }

}

As result, it requires 3422830 gas for tx with 100 addresses. ~ 34K gas per 1 address. But it costs only 21K if transfer ether directly without contracts.

So smart contracts can't help to reduce gas for this task?

Answer 1

Yes, they can't help you. Smart contracts also create transaction for each address. And transaction cost is 21k gas.