eth_estimateGas - Somnia

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 necessary to complete a transaction on the Somnia network. This is essential for setting appropriate gas limits. Somnia's IceDB provides deterministic performance, enabling more accurate gas estimation than traditional blockchains.

Parameters

Parameter

Type

Required

Description

transaction

object

Yes

Transaction call object

blockNumber

string

Block number in hex, or "latest" (default)

Transaction Object

Field

Type

Required

Description

from

string

Sender address

string

Recipient address

gas

string

Gas limit

gasPrice

string

Gas price

value

string

Value to send

data

string

Transaction data

Request Example

cURL

curl -X POST https://go.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45",
      "to": "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199",
      "value": "0xde0b6b3a7640000"
    }
  ]
}'

JavaScript (Axios)

const axios = require('axios');

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
  jsonrpc: '2.0',
  id: 'getblock.io',
  method: 'eth_estimateGas',
  params: [
    {
      from: '0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45',
      to: '0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199',
      value: '0xde0b6b3a7640000'
    }
  ]
};

axios.post(url, payload, {
  headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));

Python

import requests
import json

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

payload = {
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "method": "eth_estimateGas",
    "params": [
        {
            "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45",
            "to": "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199",
            "value": "0xde0b6b3a7640000"
        }
    ]
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(response.json())

Rust

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let payload = json!({
        "jsonrpc": "2.0",
        "id": "getblock.io",
        "method": "eth_estimateGas",
        "params": [{
            "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45",
            "to": "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199",
            "value": "0xde0b6b3a7640000"
        }]
    });

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);
    
    Ok(())
}

Response Example

Response (JSON)

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

Response Parameters

Parameter

Type

Description

result

string

Gas estimate in hex (0x5208 = 21000 for simple transfer)

Use Cases

Calculate transaction costs before sending
Set appropriate gas limits
Budget gas for complex contract interactions
Optimize transaction parameters
Prevent out-of-gas errors

Error Handling

Error Code

Description

-32602

Invalid params - malformed transaction object

-32603

Internal error - execution reverted

-32000

Execution error - insufficient funds or revert

SDK Integration

Ethers.js

const { ethers } = require('ethers');

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

const gasEstimate = await provider.estimateGas({
  from: '0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45',
  to: '0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199',
  value: ethers.parseEther('1.0')
});
console.log(gasEstimate.toString());

Viem

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

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

const gasEstimate = await client.estimateGas({
  account: '0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45',
  to: '0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199',
  value: parseEther('1')
});
console.log(gasEstimate);

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Parameters

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Request Example

Response Example

Response Parameters

Use Cases

Error Handling

SDK Integration