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To onboard users to a project quickly, I want to build my own little Rinkeby-faucet where users with new accounts (0 ETH) can get a bit of ETH by clicking a button.

However, just calling the requestDrip() function causes upfront costs and a 0-ETH user can't call it:

pragma solidity ^0.5.0;

contract MyFaucet {
  function () external payable {}

  function requestDrip() public {
    msg.sender.transfer(0.01 * 1000000000000000000);
  }
}

Is there a way I can let the smart contract pay for this users transaction costs? Or is there any other strategy to let 0-ETH users request funds on a smart contract directly?

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