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

curl --location --request POST 'https://shared.eu-central-1.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"
}'

JavaScript (axios)

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://shared.eu-central-1.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));

Python (requests)

estimate_gas.py

import requests
import json

url = "https://shared.eu-central-1.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)

Rust (reqwest)

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://shared.eu-central-1.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.js

ethers-estimate.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.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

viem-estimate.js

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

const client = createPublicClient({
    chain: worldchain,
    transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')
});

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