eth_chainId - BSC

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

This method returns the chain ID of the BNB Smart Chain network. The chain ID is used to prevent replay attacks across different EVM networks. BSC Mainnet uses chain ID 56, while the Testnet uses 97. This value is essential for transaction signing and network identification.

Parameters

None

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_chainId",
    "params": [],
    "id": "getblock.io"
}'

JavaScript (Axios)

const axios = require('axios');

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

const payload = {
    jsonrpc: '2.0',
    method: 'eth_chainId',
    params: [],
    id: 'getblock.io'
};

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

Python

import requests
import json

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

payload = {
    "jsonrpc": "2.0",
    "method": "eth_chainId",
    "params": [],
    "id": "getblock.io"
}

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

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",
        "method": "eth_chainId",
        "params": [],
        "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

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x38"
}

Response Parameters

Parameter

Type

Description

jsonrpc

string

JSON-RPC version (2.0)

string

Request identifier

result

string

Chain ID in hex (0x38 = 56 for BSC Mainnet)

Use Cases

Verify connection to correct network
Include in transaction signing for replay protection
Validate RPC endpoint configuration
Network detection in multi-chain applications
Wallet network switching

Error Handling

Error Code

Description

-32603

Internal error - node processing issues

-32000

Server error - RPC endpoint unavailable

SDK Integration

Ethers.js

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

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

const network = await provider.getNetwork();
console.log('Chain ID:', network.chainId); // 56n for BSC Mainnet

Viem

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

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

const chainId = await client.getChainId();
console.log('Chain ID:', chainId); // 56 for BSC Mainnet

Previouseth_getBlockTransactionCountByHash - BSC Nextnet_version - BSC

Last updated 12 days ago

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