> 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/backrunme-program/arbonlymev.md).

# arbOnlyMEV Stream

The `arbOnlyMEV` stream provides real-time access to private transactions that carry arbitrage potential. These transactions are submitted privately via bloXroute’s and are not visible in the public mempool or standard transaction feeds.

Searchers use this stream to identify MEV opportunities and submit backrun-only bundles.

Service available via Cloud API only.

## **Stream Endpoint**

* **Method**: `arbOnlyMEV`
* **Endpoint**: `backrunme.blxrbdn.com`

### Parameters

| **`include`** | Fields to include in the transaction stream. | **`transactions`** |
| ------------- | -------------------------------------------- | ------------------ |

### **Examples**

{% tabs %}
{% tab title="wscat" %}

```bash
wscat -c wss://backrunme.blxrbdn.com/ws --no-check --header "Authorization: <YOUR-AUTHORIZATION-HEADER>"
> {"id": 1, "method": "subscribe", "params": ["arbOnlyMEV", {"include": ["transactions"]}]}
< ......
```

{% endtab %}

{% tab title="Node.js" %}

```javascript
var fs = require('fs');
const WebSocket = require('ws');

const ws = new WebSocket(
  "wss://backrunme.blxrbdn.com/ws", 
  {
    headers: { 
      "Authorization" : <YOUR-AUTHORIZATION-HEADER> 
    },
    rejectUnauthorized: false,
  }
);

function proceed() {
    ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "subscribe", "params": ["arbOnlyMEV", {"include": ["transactions"]}]}`);
}


function handle(nextNotification) {
    console.log(nextNotification.toString()); // or process it generally
}

ws.on('open', proceed);
ws.on('message', handle);

```

{% endtab %}

{% tab title="Python" %}

```python
import asyncio, json, websockets

async def main():
    auth_key = "YOUR_AUTHORIZATION_HEADER"
    uri = 'wss://backrunme.blxrbdn.com/ws'
    async with websockets.connect(
            uri,
            header=["Authorization:{}".format(auth_key)],            
            sslopt={"cert_reqs": ssl.CERT_NONE},
    ) as websocket:
        subscribe_request = {
            "jsonrpc": "2.0",
            "id": 1,
            "method": "subscribe",
            "params": ["arbOnlyMEV", {"include": ["transactions"]}]
        }
        await websocket.send(json.dumps(subscribe_request))
        response = await websocket.recv()
        subscription_id = json.loads(response)["result"]

        while True:
            next_notification = await websocket.recv()
            print(next_notification)  # or process it generally

        unsubscribe_request = {
            "jsonrpc": "2.0",
            "id": 2,
            "method": "unsubscribe",
            "params": [subscription_id]
        }
        await websocket.send(json.dumps(unsubscribe_request))

if __name__ == '__main__':
    asyncio.run(main())    
```

{% endtab %}

{% tab title="Golang" %}

```go
package main

import (
	"crypto/tls"
	"fmt"
	"github.com/gorilla/websocket"
	"net/http"
)

func main() {
  tlsConfig := &tls.Config{
  	InsecureSkipVerify: true,
  }
  dialer := websocket.DefaultDialer
  dialer.TLSClientConfig = tlsConfig
  wsSubscriber, _, err := dialer.Dial("wss://backrunme.blxrbdn.com/ws", http.Header{"Authorization": []string{<YOUR-AUTHORIZATION-HEADER>}})

	if err != nil {
		fmt.Println(err)
		return
	}

	subRequest := `{"id": 1, "method": "subscribe", "params": ["arbOnlyMEV", {"include": ["transactions"]}]}`
	err = wsSubscriber.WriteMessage(websocket.TextMessage, []byte(subRequest))
	if err != nil {
		fmt.Println(err)
		return
	}

	for {
		_, nextNotification, err := wsSubscriber.ReadMessage()
		if err != nil {
			fmt.Println(err)
		}
		fmt.Println(string(nextNotification)) // or process it generally
	}
}
```

{% endtab %}
{% endtabs %}

#### Response

{% tabs %}
{% tab title="Transaction Event" %}

```bash
<<< {
  "jsonrpc": "2.0",
  "id": null,
  "method": "subscribe",
  "params": {
    "subscription": "3c87cccd-0df5-4938-947e-b24f7602f147",
    "result": {
      "transactions": [
          {
          "txHash": "0x88b...296",
          "txContents": {
            "from": "0x6e9...f89",
            "gas": "0x299b6",
            "gasPrice": "0xf9982de00",
            "hash": "0x88b...296",
            "input": "0x18...cc2",
            "nonce": "0xf",
            "value": "0x0",
            "type": "0x0",
            "to": "0x7a2...88d"
          },
          "localRegion": true
        }
      ]
    }
  }
}
```

{% endtab %}
{% endtabs %}


---

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