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@web3-onboard/gas
Advanced tools
Estimate the gas prices needed to get a transaction in to the next block for Ethereum Mainnet and Polygon Matic Mainnet.
Supports both Eth Mainnet and Polygon gas pricing.
NPM
npm i @web3-onboard/gas
Yarn
yarn add @web3-onboard/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'
})
This example assumes you have already setup web3-onboard to connect wallets to your dapp. For more information see web3-onboard docs.
import gas from '@web3-onboard/gas'
import { ethers } from 'ethers'
// Set provider using the Web3-Onboard wallet.provider instance from the connected wallet
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)
}
FAQs
Estimate the gas prices needed to get a transaction in to the next block for Ethereum Mainnet and Polygon Matic Mainnet.
We found that @web3-onboard/gas demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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