eth_estimategas - Worldchain

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

Generates and returns an estimate of the gas required to complete the transaction on the World Chain network.

Parameters

Parameter

Type

Description

transaction

object

Transaction call object with to, data, and optional from, gas, gasPrice, value

blockNumber

string

(Optional) Block number in hex, or "latest", "earliest", "pending"

Request

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": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e", "to": "0x1234567890123456789012345678901234567890", "value": "0x9184e72a000"}],
    "id": "getblock.io"
}'

estimateGas.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{"from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e", "to": "0x1234567890123456789012345678901234567890", "value": "0x9184e72a000"}],
    "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": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e", "to": "0x1234567890123456789012345678901234567890", "value": "0x9184e72a000"}],
    "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": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e", "to": "0x1234567890123456789012345678901234567890", "value": "0x9184e72a000"}],
            "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

Hexadecimal representation of the estimated gas amount

Use Case

The eth_estimateGas method on World Chain is typically used for:

Gas estimation
Transaction cost calculation
Gas limit setting
Fee optimization

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN

Web3 Integration

ethers-estimate.js

import { ethers } from 'ethers';

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

const gasEstimate = await provider.estimateGas({
    from: '0x742d35Cc6634C0532925a3b844Bc454e4438f44e',
    to: '0x1234567890123456789012345678901234567890',
    value: ethers.parseEther('0.001')
});
console.log('Gas Estimate:', gasEstimate.toString());

viem-estimate.js

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

const client = createPublicClient({
    chain: worldchain,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

const gasEstimate = await client.estimateGas({
    account: '0x742d35Cc6634C0532925a3b844Cc454e4438f44e',
    to: '0x1234567890123456789012345678901234567890',
    value: parseEther('0.001')
});
console.log('Gas Estimate:', gasEstimate);

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