eth_estimateGas - Monad

Example code for the eth_estimateGas JSON-RPC method. Complete guide on how to use eth_estimateGas JSON-RPC in GetBlock Web3 documentation.

This method generates an estimate of how much gas is needed for a transaction to complete. The transaction will not be added to the blockchain.

Parameters

Parameter

Type

Required

Description

transaction

object

Yes

The transaction call object.

transaction.from

string

The address the transaction is sent from.

transaction.to

string

The address the transaction is directed to.

transaction.gas

string

Upper limit of gas for the transaction (hex).

transaction.gasPrice

string

Gas price in wei (hex).

transaction.value

string

Value sent with the transaction (hex).

transaction.data

string

Hash of the method signature and encoded parameters.

blockNumber

string

Block number in hex, or "latest", "earliest", "pending".

Request

curl

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
        "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
        "to": "0x4bbeeb066ed09b7aed07bf39eee0460dfa261520",
        "value": "0xde0b6b3a7640000"
    }],
    "id": "getblock.io"
}'

estimateGas.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
        "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
        "to": "0x4bbeeb066ed09b7aed07bf39eee0460dfa261520",
        "value": "0xde0b6b3a7640000"
    }],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

estimate_gas.py

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
        "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
        "to": "0x4bbeeb066ed09b7aed07bf39eee0460dfa261520",
        "value": "0xde0b6b3a7640000"
    }],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

main.rs

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "eth_estimateGas",
            "params": [{
                "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
                "to": "0x4bbeeb066ed09b7aed07bf39eee0460dfa261520",
                "value": "0xde0b6b3a7640000"
            }],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x5208"
}

Response Parameters

Field

Type

Description

result

string

The estimated gas required in hexadecimal (21000 = 0x5208 for simple transfers).

Use Case

The eth_estimateGas method is essential for:

Calculating transaction gas limits
Cost estimation before transactions
Smart contract interaction planning
Wallet gas limit suggestions
DeFi transaction preparation
Batch transaction planning

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN.

-32602

Invalid params

Invalid transaction parameters.

-32000

Execution reverted

Transaction would revert.

-32000

Out of gas

Gas limit insufficient.

-32000

Insufficient funds

Not enough MON for value + gas.

Web3 Integration

ethers-estimate.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const tx = {
    from: senderAddress,
    to: recipientAddress,
    value: ethers.parseEther('1.0'),
    data: '0x'
};

const gasEstimate = await provider.estimateGas(tx);
console.log('Estimated gas:', gasEstimate.toString());

// Add buffer for safety
const gasLimit = gasEstimate * 120n / 100n; // 20% buffer

import { createPublicClient, http } from 'viem';
import { monad } from 'viem/chains';

// Create Viem client with GetBlock
const client = createPublicClient({
  chain: monad,
  transport: http("https://go.getblock.us/<ACCESS_TOKEN>"),
});

// Using the method through Viem
async function fetchAccountViem() {
    try {
        // Method-specific Viem implementation
        const result = await client.request({
            method: 'eth_estimateGas',
            param: [{
    from: senderAddress,
    to: recipientAddress,
    value: ethers.parseEther('1.0'),
    data: '0x'
}],
        });
        console.log('Result:', result);
        return result;
    } catch (error) {
        console.error('Viem Error:', error);
        throw error;
    }

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