eth_estimateGas - BSC

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 generates an estimate of how much gas is necessary to complete a transaction on the BNB Smart Chain. This is essential for setting appropriate gas limits and calculating transaction costs. BSC's low gas prices make accurate estimation important for cost optimization.

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 in wei

data

string

Contract call data

Request Example

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": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
        "to": "0x55d398326f99059fF775485246999027B3197955",
        "value": "0x0",
        "data": "0xa9059cbb0000000000000000000000008626f6940e2eb28930efb4cef49b2d1f2c9c11990000000000000000000000000000000000000000000000000de0b6b3a7640000"
    }],
    "id": "getblock.io"
}'

request.js

const axios = require('axios');

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

const payload = {
    jsonrpc: '2.0',
    method: 'eth_estimateGas',
    params: [{
        from: '0x8D97689C9818892B700e27F316cc3E41e17fBeb9',
        to: '0x55d398326f99059fF775485246999027B3197955',
        value: '0x0',
        data: '0xa9059cbb0000000000000000000000008626f6940e2eb28930efb4cef49b2d1f2c9c11990000000000000000000000000000000000000000000000000de0b6b3a7640000'
    }],
    id: 'getblock.io'
};

axios.post(url, payload, {
    headers: { 'Content-Type': 'application/json' }
})
.then(response => {
    const gasEstimate = parseInt(response.data.result, 16);
    console.log('Gas Estimate:', gasEstimate);
})
.catch(error => console.error(error));

request.py

import requests
import json

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

payload = {
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{
        "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
        "to": "0x55d398326f99059fF775485246999027B3197955",
        "value": "0x0",
        "data": "0xa9059cbb0000000000000000000000008626f6940e2eb28930efb4cef49b2d1f2c9c11990000000000000000000000000000000000000000000000000de0b6b3a7640000"
    }],
    "id": "getblock.io"
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
gas_estimate = int(response.json()["result"], 16)
print(f"Gas Estimate: {gas_estimate}")

request.rs

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",
        "method": "eth_estimateGas",
        "params": [{
            "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
            "to": "0x55d398326f99059fF775485246999027B3197955",
            "value": "0x0"
        }],
        "id": "getblock.io"
    });

    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": "0xc350"
}

Response Parameters

Parameter

Type

Description

jsonrpc

string

JSON-RPC version (2.0)

string

Request identifier

result

string

Estimated gas in hex (0xc350 = 50,000)

Use Cases

Calculate transaction costs before sending
Set appropriate gas limits for BEP-20 transfers
Budget gas for PancakeSwap swaps
Optimize DeFi 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: '0x8D97689C9818892B700e27F316cc3E41e17fBeb9',
    to: '0x55d398326f99059fF775485246999027B3197955',
    value: ethers.parseEther('0.1')
});
console.log('Gas Estimate:', gasEstimate.toString());

viem.js

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

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

const gasEstimate = await client.estimateGas({
    account: '0x8D97689C9818892B700e27F316cc3E41e17fBeb9',
    to: '0x55d398326f99059fF775485246999027B3197955',
    value: parseEther('0.1')
});
console.log('Gas Estimate:', gasEstimate);

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