eth_estimateGas - Arbitrum

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

This method estimates the gas required to execute a transaction on Arbitrum without broadcasting it. This simulates execution and returns the minimal gas needed.

Parameters

Field

Type

Required

Description

transaction

object

yes

Main transaction object used for estimation

from

string

optional

Sender address. Required for some contract calls

string

optional

Recipient or contract address. Omit when deploying a contract

gas

string (hex)

optional

Gas limit upper bound; node adjusts actual estimation

gasPrice

string (hex)

optional

Optional gas price included for compatibility

value

string (hex)

optional

Amount of ETH sent with the transaction

data

string

optional

Encoded function call or contract bytecode

block tag

string or hex

optional

Block context for the estimation, default is latest

Request

curl --location 'https://go.getblock.us/<ACCESS_TOKEN>' \
--header 'Content-Type: application/json' \
--data '{
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "id": "getblock.io",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0x44aa93095d6749a706051658b970b941c72c1d53",
      "value": "0x1"
    }
  ],
}'

import axios from 'axios'
let data = JSON.stringify({
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "id": "getblock.io",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0x44aa93095d6749a706051658b970b941c72c1d53",
      "value": "0x1"
    }
  ],
};

let config = {
  method: "post",
  maxBodyLength: Infinity,
  url: "https://go.getblock.us/<ACCESS_TOKEN>",
  headers: {
    "Content-Type": "application/json",
  },
  data: data,
};

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

import requests
import json

url = "https://go.getblock.us/<ACESS_TOKEN>"

payload = json.dumps({
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "id": "getblock.io",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0x44aa93095d6749a706051658b970b941c72c1d53",
      "value": "0x1"
    }
  ],
})
headers = {
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::builder()
        .build()?;

    let mut headers = reqwest::header::HeaderMap::new();
    headers.insert("Content-Type", "application/json".parse()?);

    let data = r#"{
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "id": "getblock.io",
  "params": [
    {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0x44aa93095d6749a706051658b970b941c72c1d53",
      "value": "0x1"
    }
  ],
}"#;

    let json: serde_json::Value = serde_json::from_str(&data)?;

    let request = client.request(reqwest::Method::POST, "https://go.getblock.us/<ACCESS_TOKEN>")
        .headers(headers)
        .json(&json);

    let response = request.send().await?;
    let body = response.text().await?;

    println!("{}", body);

    Ok(())
}

Response

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

Reponse Parameter Definition

Field

Type

Description

result

string (hex)

Estimated gas required for the transaction

Use case

eth_estimateGas is used to:

Estimating gas before sending an on-chain transaction
Setting safe gas limits for dApps and wallets
Contract deployments
Approvals, swaps, mints, transfers
Estimating costs for batch calls
Preventing out-of-gas failures

Error handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS_TOKEN.

Integration with Web3

The eth_estimateGas can help developers:

Allows dApps to simulate actions safely
Helps builders understand live contract state without spending gas
Useful for DeFi dashboards, explorers, and analytics tools
Enables wallets to preview costs before sending a transaction
Supports trustless frontends because the estimation is done by the blockchain directly
Test interactions like swaps, mints, or transfers without actual execution

import { ethers } from "ethers";
const RPC_URL = "https://go.getblock.us/<ACCESS_TOKEN>";
const provider = new ethers.JsonRpcProvider(RPC_URL);
async function Call() {
  try {
     const result = await provider.send("eth_estimateGas", [
       {
         from: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
         to: "0x44aa93095d6749a706051658b970b941c72c1d53",
         value: "0x1",
       },
     ]);
    console.log("The result:", result);
    return result;
  } catch (error) {
    console.error("The error:", error);
    throw error;
  }
}

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

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

// Using the method through Viem
async function Call() {
    try {
        // Method-specific Viem implementation
        const result = await client.request({
          method: "eth_estimateGas",
          params: [
            {
              from: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
              to: "0x44aa93095d6749a706051658b970b941c72c1d53",
              value: "0x1",
            },
          ]
        });
        console.log('Result:', result);
        return result;
    } catch (error) {
        console.error('Viem Error:', error);
        throw error;
    }
}

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Parameters

Request

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Reponse Parameter Definition

Use case

Error handling

Integration with Web3