# Raw Transaction Construction

The `blxr_tx` endpoint expects raw transaction bytes. These are usually built using libraries like **web3** or **ethers**.\
Below are examples showing how to:

* Create and send a simple transfer via `blxr_tx`
* Create and send a token swap transaction via `blxr_tx`

{% tabs %}
{% tab title="Transfer - Node.js" %}

```javascript
const WebSocket = require('ws')
const EthereumTx = require('ethereumjs-tx').Transaction
// Needed for BSC
// const Common = require('ethereumjs-common').default
const Web3 = require('web3')

const web3 = new Web3('PROVIDER_URL')

const account = 'YOUR_ADDRESS'

const privateKey = Buffer.from(
  'YOUR_PRIVATE_KEY',
  'hex',
)
// const BSC = Common.forCustomChain(
//   'mainnet',
//   {
//       name: 'Binance Smart Chain Mainnet',
//       networkId: 56,
//       chainId: 56,
//       url: 'https://bsc-dataseed.binance.org/'
//   },
//   'istanbul',
// )

const main = async () => {
  const tx = new EthereumTx({
      to: 'TO_ADDRESS',
      nonce: nonce,
      // Pass in decimal number for fields below
      gasPrice: web3.utils.toHex(),
      gas: web3.utils.toHex(),
      value: web3.utils.toHex(),
      chainId: 1
      // If using BSC
      // chainId: 56
    } //, { common: BSC } 
  )
  tx.sign(privateKey)

  const serializedTx = tx.serialize()
  const rawTx = serializedTx.toString('hex')
  
  const ws = new WebSocket(
    "ws://127.0.0.1:28333/ws", 
    {
      headers: { 
        "Authorization" : <YOUR-AUTHORIZATION-HEADER>
      },
      rejectUnauthorized: false,
    }
  );

  function proceed() {
    ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "${rawTx}"}}`)
  }

  function handle(response) {
    console.log(response.toString()) // Or process it generally
  }
  ws.on('open', proceed)
  ws.on('message', handle)
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.bloxroute.com/bsc/submit-transactions/raw-transaction-construction.md?ask=<question>
```

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.