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
export const wagmiAbi = [
...
{
inputs: [],
name: "mint",
outputs: [{ name: "", type: "uint32" }],
stateMutability: "view",
type: "function",
},
...
] as const;
import { createPublicClient, http } from 'viem'
import { privateKeyToAccount } from 'viem/accounts'
import { mainnet } from 'viem/chains'
// JSON-RPC Account
export const account = '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'
// Local Account
export const account = privateKeyToAccount(...)
export const publicClient = createPublicClient({
chain: mainnet,
transport: http()
})
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
export const wagmiAbi = [
...
{
inputs: [{ name: "owner", type: "uint32" }],
name: "mint",
outputs: [{ name: "", type: "uint32" }],
stateMutability: "view",
type: "function",
},
...
] as const;
import { createPublicClient, http } from 'viem'
import { privateKeyToAccount } from 'viem/accounts'
import { mainnet } from 'viem/chains'
// JSON-RPC Account
export const account = '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'
// Local Account
export const account = privateKeyToAccount(...)
export const publicClient = createPublicClient({
chain: mainnet,
transport: http()
})
Return Value
bigint
The gas estimate.
Parameters
address
- Type:
Address
The contract address.
const { result } = await publicClient.estimateContractGas({
address: '0xFBA3912Ca04dd458c843e2EE08967fC04f3579c2',
abi: wagmiAbi,
functionName: 'mint',
account,
})
abi
- Type:
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)
- Type:
AccessList
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',
})