# eth\_getTransactionByBlockNumberAndIndex - Arbitrum This method retrieves a transaction from a block, using the block number and the transaction index within it. This method is essential for inspecting the precise ordering of transactions and analyzing how blocks are structured. #### Parameters | Parameter | Type | Required | Description | | ------------- | ------------ | -------- | -------------------------------------------------------------------------------------------------------- | | block\_number | string | yes | The block number encoded as a hex string. Special values: `"latest"`, `"earliest"`, `"pending"`. | | index | string (hex) | yes | The position of the transaction in the block, encoded as a hex integer (for example `"0x0"` or `"0x5"`). | #### Request {% tabs %} {% tab title="cURL" %} ```bash curl --location 'https://go.getblock.us/' \ --header 'Content-Type: application/json' \ --data '{ "jsonrpc": "2.0", "method": "eth_getTransactionByBlockNumberAndIndex", "params": ["latest", "0x0"], "id": "getblock.io" }' ``` {% endtab %} {% tab title="Axios" %} ```javascript import axios from 'axios' let data = JSON.stringify({ "jsonrpc": "2.0", "method": "eth_getTransactionByBlockNumberAndIndex", "params": ["latest", "0x0"], "id": "getblock.io" }; let config = { method: "post", maxBodyLength: Infinity, url: "https://go.getblock.us/", headers: { "Content-Type": "application/json", }, data: data, }; axios .request(config) .then((response) => { console.log(JSON.stringify(response.data)); }) .catch((error) => { console.log(error); }); ``` {% endtab %} {% tab title="Request" %} ```python import requests import json url = "https://go.getblock.us/" payload = json.dumps({ "jsonrpc": "2.0", "method": "eth_getTransactionByBlockNumberAndIndex", "params": ["latest", "0x0"], "id": "getblock.io" }) headers = { 'Content-Type': 'application/json' } response = requests.request("POST", url, headers=headers, data=payload) print(response.text) ``` {% endtab %} {% tab title="Rust" %} ```rs #[tokio::main] async fn main() -> Result<(), Box> { let client = reqwest::Client::builder() .build()?; let mut headers = reqwest::header::HeaderMap::new(); headers.insert("Content-Type", "application/json".parse()?); let data = r#"{ "jsonrpc": "2.0", "method": "eth_getTransactionByBlockNumberAndIndex", "params": ["latest", "0x0"], "id": "getblock.io" }"#; let json: serde_json::Value = serde_json::from_str(&data)?; let request = client.request(reqwest::Method::POST, "https://go.getblock.us/") .headers(headers) .json(&json); let response = request.send().await?; let body = response.text().await?; println!("{}", body); Ok(()) } ``` {% endtab %} {% endtabs %} #### Response ```java { "jsonrpc": "2.0", "id": "getblock.io", "result": { "blockHash": "0xbb465c64e929a4700a6c5cfc3355e651e0f558134e09e06b4c65657f24499cec", "blockNumber": "0x185f29e6", "from": "0x00000000000000000000000000000000000a4b05", "gas": "0x0", "gasPrice": "0x0", "hash": "0x61d48ab94f7fccf48f4baa3903781053f932feb466474c037736e910d7ca2afe", "input": "0x6bf6a42d000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000016ddb2700000000000000000000000000000000000000000000000000000000185f29e60000000000000000000000000000000000000000000000000000000000000000", "nonce": "0x0", "to": "0x00000000000000000000000000000000000a4b05", "transactionIndex": "0x0", "value": "0x0", "type": "0x6a", "chainId": "0xa4b1", "v": "0x0", "r": "0x0", "s": "0x0" } } ``` #### Reponse Parameter Definition | Field | Type | Description | | ---------------- | -------------- | ---------------------------------------------------- | | hash | string | Hash of the transaction | | blockHash | string | Hash of the block this transaction belongs to | | blockNumber | string (hex) | Block number | | from | string | Sender address | | to | string or null | Receiver address or null for contract creation | | value | string (hex) | Value transferred in wei | | nonce | string (hex) | Number of transactions previously sent by the sender | | gas | string (hex) | Gas limit | | gasPrice | string (hex) | Gas price in wei | | input | string (hex) | Transaction calldata | | transactionIndex | string (hex) | Index of the transaction inside the block | | v, r, s | string | ECDSA signature values | #### Use case The `eth_getTransactionByBlockNumberAndIndex` : * Show block transaction lists sorted by index * Helps indexers and analytics platforms reconstruct transaction sequencing * Useful for debugging or tracking transaction ordering effects like MEV * Wallets can verify whether a transaction was placed at the expected block position * Helps monitoring systems detect anomalies such as missing or reordered transactions #### Error handling | Status Code | Error Message | Cause | | ----------- | ---------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 403 | Forbidden | Missing or invalid ACCESS\_TOKEN. | | -32602 | Invalid argument |
  • The block number does not exist or is beyond the chain height
  • Index is not a valid hex integer
  • Block does have transaction at that index
| #### Integration with Web3 The `eth_getTransactionByBlockNumberAndIndex` method helps developers: * Build trustless UIs that load transaction lists directly from RPC * Power dashboards analyzing block activity and congestion * Support exchanges, wallets, and bridges that track transaction placement * Generate block-level historical analytics * Verify transaction ordering for MEV, priority fees, and gas bidding strategies {% tabs %} {% tab title="Ethers.js" %} ```javascript import { ethers } from "ethers"; const RPC_URL = "https://go.getblock.us/"; const provider = new ethers.JsonRpcProvider(RPC_URL); async function Call() { try { const result = await provider.send( "eth_getTransactionByBlockNumberAndIndex", ["latest", "0x0"]); console.log("The result:", result); return result; } catch (error) { console.error("The error:", error); throw error; } } ``` {% endtab %} {% tab title="Viem" %} ```jsx import { createPublicClient, http } from 'viem'; import { arbitrum } from 'viem/chains'; // Create Viem client with GetBlock const client = createPublicClient({ chain: arbitrum, transport: http('https://go.getblock.us/'), }); // Using the method through Viem async function Call() { try { // Method-specific Viem implementation const result = await client.request({ method: "eth_getTransactionByBlockNumberAndIndex", params: ["latest", "0x0"] }); console.log('Result:', result); return result; } catch (error) { console.error('Viem Error:', error); throw error; } } ``` {% endtab %} {% endtabs %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.getblock.io/api-reference/arbitrum-arb/arbitrum_eth_gettransactionbyblocknumberandindex.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.