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estimateContractGas

Estimates the gas required to successfully execute a contract write function call.

Internally, estimateContractGas uses a Public Client to call the estimateGas action with ABI-encoded data.

Usage

Below is a very basic example of how to estimate gas (with no arguments).

The mint function accepts no arguments, and returns a token ID.

import { account, publicClient } from './config'
import { wagmiAbi } from './abi'
 
const gas = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  account,
})
// 69420n

Passing Arguments

If your function requires argument(s), you can pass them through with the args attribute.

TypeScript types for args will be inferred from the function name & ABI, to guard you from inserting the wrong values.

For example, the mint function name below requires a tokenId argument, and it is typed as [number].

import { account, publicClient } from './config'
import { wagmiAbi } from './abi'
 
const gas = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
})
// 69420n

Return Value

bigint

The gas estimate.

Parameters

address

The contract address.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2', 
  abi: wagmiAbi,
  functionName: 'mint',
  account,
})

abi

The contract's ABI.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi, 
  functionName: 'mint',
  account,
})

functionName

  • Type: string

A function to extract from the ABI.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint', 
  account,
})

account

  • Type: Account | Address

The Account to estimate gas from.

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

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'
})

accessList (optional)

The access list.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  accessList: [{ 
    address: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
    storageKeys: ['0x1'],
  }], 
  account,
})

args (optional)

  • Type: Inferred from ABI.

Arguments to pass to function call.

const { result } = await publicClient.estimateContractGas({
  address: '0x1dfe7ca09e99d10835bf73044a23b73fc20623df',
  abi: wagmiAbi,
  functionName: 'balanceOf',
  args: ['0xa5cc3c03994DB5b0d9A5eEdD10CabaB0813678AC'], 
  account,
})

gasPrice (optional)

  • Type: bigint

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

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
  gasPrice: parseGwei('20'), 
})

maxFeePerGas (optional)

  • Type: bigint

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

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
  maxFeePerGas: parseGwei('20'),  
})

maxPriorityFeePerGas (optional)

  • Type: bigint

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

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
  maxFeePerGas: parseGwei('20'),
  maxPriorityFeePerGas: parseGwei('2'), 
})

nonce (optional)

  • Type: number

Unique number identifying this transaction.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
  nonce: 69
})

value (optional)

  • Type: number

Value in wei sent with this transaction.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  args: [69420],
  account,
  value: parseEther('1') 
})

blockNumber (optional)

  • Type: number

The block number to perform the read against.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  account,
  blockNumber: 15121123n, 
})

blockTag (optional)

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

The block tag to perform the read against.

const { result } = await publicClient.estimateContractGas({
  address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
  abi: wagmiAbi,
  functionName: 'mint',
  account,
  blockTag: 'safe', 
})