eth_getTransactionByBlockNumberAndIndex - Arbitrum Nova

Example code for the eth_getTransactionByBlockNumberAndIndex JSON-RPC method. Complete guide on how to use eth_getTransactionByBlockNumberAndIndex JSON-RPC in GetBlock Web3 documentation.

This method returns the transaction at a given index within a block identified by its number or tag.

Parameters

Parameter	Type	Required	Description
blockParameter	string	Yes	Block number in hex, or "latest", "earliest", "pending"
index	string	Yes	Transaction index within the block (hex)

Request

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionByBlockNumberAndIndex",
    "params": ["latest", "0x0"],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_getTransactionByBlockNumberAndIndex',
    params: ['latest', '0x0'],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_getTransactionByBlockNumberAndIndex',
        'params': ['latest', '0x0'],
        '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://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_getTransactionByBlockNumberAndIndex",
            "params": ["latest", "0x0"],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

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

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "hash": "0x3c8a1f5b2d9e4076c1a8b3d5e7f9021436587a9cbdef012345678abcdef901234",
        "blockHash": "0x9f2b4c1d7e3a6084b5c9d0e1f2a3b4c5d6e7f8091a2b3c4d5e6f708192a3b4c5d",
        "blockNumber": "0x14b8a10",
        "transactionIndex": "0x0",
        "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
        "to": "0x4200000000000000000000000000000000000006",
        "value": "0x0"
    }
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	object	Transaction object, or null if the index is out of range

Use Cases

• Positional Lookup: Fetch a transaction by height and index

• Live Block Scanning: Read the first transaction of the "latest" block

• Block Iteration: Walk a block's transactions by index without its hash

• Explorer Backends: Resolve a transaction from a number-and-index reference

Error Handling

Error Code	Message	Description
-32602	Invalid params	Malformed block number/tag or index
-32603	Internal error	The node failed to read the transaction

Web3 Integration

Ethers.js

ethers-example.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

const tx = await provider.send('eth_getTransactionByBlockNumberAndIndex', ['latest', '0x0']);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';

const client = createPublicClient({
  transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')
});

const tx = await client.getTransaction({ blockTag: 'latest', index: 0 });