> For the complete documentation index, see [llms.txt](https://docs.bloxroute.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bloxroute.com/bsc/submit-transactions/raw-transaction-construction.md).

# 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 %}


---

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