Gas

import gas from '@web3-onboard/gas'  // subscribe to a single chain for estimates using the default poll rate of 5 secs // API key is optional and if provided allows for faster poll rates const ethMainnetGasBlockPrices = gas.stream({  chains: ['0x1'],  apiKey: '<OPTIONAL_API_KEY>',  endpoint: 'blockPrices' })  const { unsubscribe: ethGasUnsub } = ethMainnetGasBlockPrices.subscribe(  estimates => console.log(estimates) )  // .... sometime later, unsubscribe to stop polling setTimeout(ethGasUnsub, 10000)  // OR you can subscribe to multiple chains at once: const gasBlockPrices = gas.stream({  chains: ['0x1', '0x89'],  apiKey: '<OPTIONAL_API_KEY>',  endpoint: 'blockPrices',  // can override default poll rate as well  poll: 1000 })  const { unsubscribe } = gasBlockPrices.subscribe(estimates =>  console.log(estimates)  console.log(estimates[0].blockPrices[0].estimatedPrice)  // block inclusion confidence options: 70, 80, 90, 95, 99  console.log(bnGasPrices.find(gas => gas.confidence === 90)) )  // .... sometime later, unsubscribe to stop polling setTimeout(unsubscribe, 10000)  // Can also just do a one time get rather than a stream const gasBlockPrices = await gas.get({  chains: ['0x1', '0x89'],  apiKey: '<OPTIONAL_API_KEY>',  endpoint: 'blockPrices' }) 

import gas from '@web3-onboard/gas' import { ethers } from 'ethers'  // Set provider using the Web3-Onboard wallet.provider instance from the connected wallet // if using ethers v6 this is: // ethersProvider = new ethers.BrowserProvider(wallet.provider, 'any') let provider = new ethers.providers.Web3Provider(wallet.provider, 'any') let bnGasPrices  const ethMainnetGasBlockPrices = gas.stream({  chains: ['0x1'], // '0x89' can also be added/replaced here for Polygon gas data  apiKey: '<OPTIONAL_API_KEY>', // for faster refresh rates  endpoint: 'blockPrices' })  ethMainnetGasBlockPrices.subscribe(estimates => {  console.log(estimates)  bnGasPrices = estimates[0].blockPrices[0].estimatedPrices })   const gweiToWeiHex = gwei => {  return `0x${(gwei * 1e9).toString(16)}` }  const sendTransaction = async () => {  if (!toAddress) {  alert('An Ethereum address to send Eth to is required.')  return  }   const signer = provider.getUncheckedSigner()   // define desired confidence for transaction inclusion in block and set in transaction  // block inclusion confidence options: 70, 80, 90, 95, 99  const bnGasForTransaction = bnGasPrices.find(gas => gas.confidence === 90)   const rc = await signer.sendTransaction({  to: toAddress,  value: 1000000000000000   // This will set the transaction gas based on desired confidence  maxPriorityFeePerGas: gweiToWeiHex(  bnGasForTransaction.maxPriorityFeePerGas  ),  maxFeePerGas: gweiToWeiHex(bnGasForTransaction.maxFeePerGas)  })  console.log(rc) }