Contract pays for gas

Question

Is there anything solidity in line that would let a contract with ETH assigned to, to pay gas.

Say I want something simple.

contract whatever {
uint256 one;
uint256 two;
function execute() public {
one = one + two;
//execute contract side
}
}

Does something like that exist? I checked the solidity docs, couldn't find anything to my knowledge.

No (and it's probably one of the most common questions on this website). — goodvibration, Jan 02 '21 at 10:33
I must have seen in here it like 20 times before (one of them was actually yesterday if I remember correctly). — goodvibration, Jan 02 '21 at 10:46
You could set the contract to send back some ETH after a successful TX but you will never be able to perfectly match the gas 1:1 — D3l_Gato, Jan 02 '21 at 15:22
Related: https://ethereum.stackexchange.com/questions/144/can-contracts-pay-the-gas-instead-of-the-message-sender — eth, Feb 15 '21 at 10:19

score 0 · Answer 1 · answered Jan 16 '21 at 01:25

It seems the only way to have "gasless" txs go through contract side is through the implementation of OpenGSN - https://docs.opengsn.org/

Some of their examples are totally broken and I will update the answer with more relevant information on how to easily do it in a code snippet.

1 Answers1