Notes

How much KLAY do you need to pay for a transaction?

You pay gas spent * gas price amount of ether, where

• gas is a unit of computation
• gas spent is the total amount of gas used in a transaction
• gas price is how much ether you are willing to pay per gas
• Transactions with higher gas price have higher priority to be included in a block.
• Unspent gas will be refunded.

Gas Limit

There are 2 upper bounds to the amount of gas you can spend:

• gas limit (max amount of gas you're willing to use for your transaction, set by you)
• block gas limit (max amount of gas allowed in a block, set by the network)

Code

Compile and deploy the code block below:

solidity
Gas.sol
Copy
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Gas {
   uint public i = 0;

   // Using up all of the gas that you send causes your transaction to fail.
   // State changes are undone.
   // Gas spent are not refunded.
   function forever() public {
       // Here we run a loop until all of the gas are spent
       // and the transaction fails
       while (true) {
           i += 1;
       }
   }
}