README.md

🔥 EIP-1559 Fee Suggestions 🔥

The function suggestFees() is a utility function written in Javascript and it's intended to use with an ethers.js provider.

It returns an object containing:

• maxBaseFee and maxPriorityFee suggestions
• baseFeeTrend indicator
• currentBaseFee which is the current block base fee
• confirmationTimeByPriorityFee an object containing estimated times of confirmation by priority fee chosen
• blocksToConfirmationByPriorityFee an object containing estimated blocks of wait for a confirmation by priority fee chosen
• blocksToConfirmationByBaseFee an object containing estimated blocks of wait for a confirmation by base fee chosen

Usage

import { JsonRpcProvider } from '@ethersproject/providers';
import { suggestFees } from './src';

const main = async() => {
    const provider = new JsonRpcProvider(`https://ropsten.infura.io/v3/${YOUR_API_KEY}`);
    const ret = await suggestFees(provider);
    console.log('Result: ', ret);
}

main();

In addition, you can use specific methods to get maxBaseFee and maxPriorityFee specific data.

import { JsonRpcProvider } from '@ethersproject/providers';
import { suggestFees } from './src';

const main = async() => {
    const provider = new JsonRpcProvider(`https://ropsten.infura.io/v3/${YOUR_API_KEY}`);
    const fromBlock = 'latest' // the block that you want to run the estimations from
    const blockCountHistory = 100 // the quantity of blocks you want to take in account for the estimation
    const ret = await suggestMaxBaseFee(provider, fromBlock, blockCountHistory);
    console.log('Result: ', ret);
}

main();

import { JsonRpcProvider } from '@ethersproject/providers';
import { suggestFees } from './src';

const main = async() => {
    const provider = new JsonRpcProvider(`https://ropsten.infura.io/v3/${YOUR_API_KEY}`);
    const fromBlock = 'latest' // the block that you want to run the estimations from
    const ret = await suggestMaxPriorityFee(provider, fromBlock, blockCountHistory);
    console.log('Result: ', ret);
}

main();

Credits

The suggestMaxBaseFee estimations code is 100% based on the work of @zsfelfoldi published at https://github.com/zsfelfoldi/feehistory/