Getting the gas used via receipt/tx in ETH (BNB) ?

[iangregsondev]

Hi,

Can anyone help, I am getting an issue with trying to get the total price of a TX, the TX doesn't sent any ETH/BNB - it only uses gas.

I checked on BscSCan and the total amount being shown is 0.00012974 BNB ($0.07)

I tried this but its not come back with the correct value, I think I am using it wrong.

I did notice somebody said to use effectiveGasPrice - but that is for ethereum and I don't think it exists on BSC - actually its not there so I used gasPrice from the TX

    console.log(
      "total BNB spent on gas for transaction: \t",
      ethers.utils.formatEther(receipt.cumulativeGasUsed.mul(tx.gasPrice)),
    )

Actually outputs: total ether spent on gas for transaction: 0.05843443

and this is not what is on BscScan.

Could anybody tell me what I am doing wrong ?

Probably something silly of course, something I haven't taken into consideration

Thanks in advance

For clarity sake, I am getting the tx and receipt using this

    const tx = await bep20.approve(router.address, ethers.constants.MaxUint256)
    const receipt = await tx.wait()

[iangregsondev]

I figured it out, don't know why but I thought i tried this. Anyway this is the solution

      const gasUsed = ethers.utils.formatEther(receipt.gasUsed.mul(tx.gasPrice))