I have my base currency as 18 decimals like 1_000_000_000_000_000_000. I want to set my base fee to charge using 1_000_000_000_000_000_000 for each evm transaction. How can i do? currently i have done this but not working properly.

pub struct FixedGasPrice;

impl FeeCalculator for FixedGasPrice {
    fn min_gas_price() -> U256 {
        (1 * 1_000_000_000).into()

if i try to change this formula into (1 * 1_000_000_000_000_000_000).into() i am getting error whenever i try to deploy the contract from remix. I am getting below error:

creation of MyToken20 errored: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"code":-32603,"message":"submit transaction to pool failed: Pool(InvalidTransaction(InvalidTransaction::Custom(1)))"}}} 
  • Consider specifying: what error are you getting?
    – pepyakin
    Commented Apr 27, 2022 at 9:54
  • creation of MyToken20 errored: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"code":-32603,"message":"submit transaction to pool failed: Pool(InvalidTransaction(InvalidTransaction::Custom(1)))"}}}' Commented Apr 27, 2022 at 9:56
  • hey @FarazAhmad, were you able to change the runtime params as I said in my reply? Please consider accepting it as the correct answer if it worked for you.
    – afm
    Commented Jul 23, 2022 at 16:51
  • hey @afm i tried using your solution but in my case the transction fee keeps on decreasing ... supoose for 1st traction its 100 milli then for 2 second traction it becomes 100 micro them pico nano and them famto..it keeps on decreasing how can i fix this??? Commented Jan 5, 2023 at 11:33

2 Answers 2


To activate and set the BaseFee in your Frontier-based chain, you can simply change these runtime parameters:

frame_support::parameter_types! {
    pub IsActive: bool = true;
    pub DefaultBaseFeePerGas: U256 = U256::from(1_000_000_000);

Its likely web3.js has a great difference on gas_price with your own, you should add gasPrice to your transaction's option:

   gasPrice: await web3.eth.getGasPrice()

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