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Gas is a 'sub-currency' which enables the EVM and Ethereum's decentralised computer to run -- with each operation, an amount of gas (proportional to the computational effort required to perform the operation) is consumed.

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Gas cost too high on using IERC20.sol by openzeppelin

But when I use it via the Etherscan website, whichever functions make use of IERC20, the gas cost is too high like it's about 0.02 to 0.2 ETH and still it doesn't get through. … I am not able to understand what I did that is making the gas cost so high. I am including the gist of the code here. …
Shivam Agrawal's user avatar