starknet_getTransactionByBlockIdAndIndex - STRK

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

This method returns the transaction at a given index within the block identified by block_id. It is used to iterate a block's transactions positionally.

Parameters

Parameter	Type	Required	Description
block_id	object	string	Yes
index	integer	Yes	Zero-based index of the transaction in the block

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": "starknet_getTransactionByBlockIdAndIndex",
    "params": { "block_id": { "block_hash": "0x041b10c45dc3f39372f7b9409261cac9d880c5d75a5bb077d028db20b1bd76c4" }, "index": 1 },
    "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: 'starknet_getTransactionByBlockIdAndIndex',
    params: { block_id: { block_hash: '0x041b10c45dc3f39372f7b9409261cac9d880c5d75a5bb077d028db20b1bd76c4' }, index: 1 },
    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': 'starknet_getTransactionByBlockIdAndIndex',
        'params': { 'block_id': { 'block_hash': '0x041b10c45dc3f39372f7b9409261cac9d880c5d75a5bb077d028db20b1bd76c4' }, 'index': 1 },
        '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": "starknet_getTransactionByBlockIdAndIndex",
            "params": { "block_id": { "block_hash": "0x041b10c45dc3f39372f7b9409261cac9d880c5d75a5bb077d028db20b1bd76c4" }, "index": 1 },
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

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

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "transaction_hash": "0x5fb5b63f0226ef426c81168d0235269398b63aa145ca6a3c47294caa691cfdc",
        "type": "INVOKE",
        "version": "0x1",
        "nonce": "0x0",
        "sender_address": "0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b",
        "calldata": [
            "0x1",
            "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
            "0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e",
            "0x1",
            "0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b"
        ]
    }
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	object	Transaction body at the requested index

Use Cases

• Positional Iteration: Walk a block's transactions by index

• Indexing: Pair transactions with their block position

• Explorer Backends: Resolve a transaction from a block + index route

• Verification: Cross-check a transaction's placement in a block

Error Handling

Error	Message	Description
27 / INVALID_TXN_INDEX	Invalid transaction index	The index is out of range for the block
24 / BLOCK_NOT_FOUND	Block not found	No block matches the supplied block_id