eth_estimateGas - Sonic

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 returns an estimate of the gas required to execute a transaction, without submitting it. The estimate accounts for the current state and is commonly padded before sending.

Parameters

Parameter	Type	Required	Description
transaction	object	Yes	Transaction call object
blockParameter	string	No	Block number in hex, or "latest", "earliest", "pending"

Transaction Object

Field	Type	Required	Description
from	string	No	20-byte sender address
to	string	Yes	20-byte recipient or contract address
gas	string	No	Gas limit for the call (hex)
gasPrice	string	No	Gas price in wei (hex)
value	string	No	Value to send in wei (hex)
data	string	No	Encoded function call data

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": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "value": "0xde0b6b3a7640000"}],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_estimateGas',
    params: [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "value": "0xde0b6b3a7640000"}],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_estimateGas',
        'params': [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "value": "0xde0b6b3a7640000"}],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

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

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_estimateGas",
            "params": [{"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "to": "0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "value": "0xde0b6b3a7640000"}],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

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

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	string	Hex-encoded estimated gas units

Use Cases

• Gas Budgeting: Estimate gas before building a transaction

• Fee Preview: Show a user the expected cost of an action

• Revert Detection: Detect a call that would revert before submitting

• Batch Sizing: Size a batch of operations under the block gas limit

Error Handling

Error Code	Message	Description
-32602	Invalid params	Invalid transaction object or block parameter
-32603	Internal error	Contract execution error
3	Execution reverted	The contract reverted the call
-32000	Execution error	Insufficient gas or other execution failure

Web3 Integration

Ethers.js

ethers-example.js

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

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

const gas = await provider.estimateGas({
    from: '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045', to: '0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38', value: ethers.parseEther('1.0')
});
console.log(gas);

Viem

viem-example.js

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

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

const gas = await client.estimateGas({
    account: '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045', to: '0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38', value: 1000000000000000000n
});
console.log(gas);