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estimateGas

An Action for estimating gas for a transaction.

Estimates the gas necessary to complete a transaction without submitting it to the network.

Usage

example.ts
import { account, publicClient } from './config'
 
const gas = await publicClient.estimateGas({ 
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

Returns

bigint

The gas estimate (in wei).

Parameters

account

  • Type: Account | Address

The Account to estimate gas from.

Accepts a JSON-RPC Account or Local Account (Private Key, etc).

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266', 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

data (optional)

  • Type: 0x${string}

Contract code or a hashed method call with encoded args.

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  data: '0x...', 
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

gasPrice (optional)

  • Type: bigint

The price (in wei) to pay per gas. Only applies to Legacy Transactions.

import { parseEther, parseGwei } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  gasPrice: parseGwei('20'), 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1') 
})

maxFeePerGas (optional)

  • Type: bigint

Total fee per gas (in wei), inclusive of maxPriorityFeePerGas. Only applies to EIP-1559 Transactions

import { parseEther, parseGwei } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  maxFeePerGas: parseGwei('20'),  
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

maxPriorityFeePerGas (optional)

  • Type: bigint

Max priority fee per gas (in wei). Only applies to EIP-1559 Transactions

import { parseEther, parseGwei } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  maxFeePerGas: parseGwei('20'),
  maxPriorityFeePerGas: parseGwei('2'), 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

to (optional)

Transaction recipient.

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8', 
  value: parseEther('1')
})

value (optional)

  • Type: bigint

Value (in wei) sent with this transaction.

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1') 
})

blockNumber (optional)

  • Type: number

The block number to perform the gas estimate against.

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  blockNumber: 15121123n, 
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1') 
})

blockTag (optional)

  • Type: 'latest' | 'earliest' | 'pending' | 'safe' | 'finalized'
  • Default: 'latest'

The block tag to perform the gas estimate against.

import { parseEther } from 'viem'
 
const gas = await publicClient.estimateGas({
  blockTag: 'safe', 
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1') 
})

JSON-RPC Methods

eth_estimateGas