How to charge a fee in ethereum smart contract transactions

Question

I need help on how to charge a transaction fee in ethereum smart contract using web3? Also which web3 API can be used to check the validation of enough gas on the frontend of smart contract?

HelioWallet.com · Answer

Do you want to estimate the fee of the transaction?

let gasPrice = new BigNumber(15).times(1000000000);
let gasLimit = new BigNumber(21000);
let estimateFee = new BigNumber(gasPrice.times(gasLimit)).dividedBy(1000000000000000000).toString();

How to charge a fee in ethereum smart contract transactions

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