# Private Transactions

The `bsc_private_tx` endpoint allows users to submit a single transaction directly to blocks built by bloXroute block builders. These BSC transactions receive automatic front-running protection at the server level.

Private transactions are automatically enrolled in the BackRunMe service, which returns some of the generated profit to the searcher. The endpoint returns a transaction hash upon successful submission.

This service is available via **Cloud API** only.

## Submission Endpoint

* Method: `bsc_private_tx`
* Endpoint: `api.blxrbdn.com` (Cloud API)
* Request type: *`HTTPS,WSS`*

#### Enable Dynamic Fees

We have implemented a new mechanism to improve transaction landing speed and prioritization. To enable this mechanism:

1. Send a fee payment as an **internal transaction** to the bloXroute smart contract:\
   \&#xNAN;**`0x6374Ca2da5646C73Eb444aB99780495d61035f9b`**
2. Include the following field in your submission request payload:

   ```json
   "mev_builders": ["all"]
   ```

### Parameters

<table><thead><tr><th width="238.38588460286456">Parameter</th><th width="282.727783203125">Description</th><th>Instructions &#x26; Notes</th></tr></thead><tbody><tr><td><strong><code>transaction</code></strong></td><td>Raw transactions bytes without <strong><code>0x</code></strong> prefix. </td><td><strong>Mandatory</strong><em>.</em> Learn more about constructing the transaction <a href="../../eth/sending-transactions/raw-transaction-construction">here</a>.</td></tr><tr><td><code>mev_builders</code></td><td><p></p><p>A list of MEV builders that should receive the transaction without delay. </p></td><td><p><em>[Optional, default: <code>bloxroute</code> builder]</em> <br></p><p>Possible MEV builders are:</p><ul><li><code>bloxroute</code>: bloXroute internal builder </li><li><code>all</code>: all builders</li><li>Other options: <code>48club</code>, <code>blockrazor</code>, <code>jetbldr</code>, <code>nodereal</code></li></ul></td></tr><tr><td><code>backrunme_reward_address</code></td><td>String – valid BSC address specifying where backrun rewards should be shared.</td><td>Optional - See  <a href="../../backrunme-program/overview">Backrunme program</a></td></tr></tbody></table>

### Examples&#x20;

{% tabs %}
{% tab title="HTTP POST" %}

```
curl http://api.blxrbdn.com \
  --insecure \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: <YOUR-AUTHORIZATION-HEADER>" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "bsc_private_tx",
    "params": {
      "transaction": "f86b0184...e0b58219",
      "mev_builders": ["all"],
      "backrunme_reward_address": "0xYourRewardAddressHere"
    }
  }'

```

{% endtab %}

{% tab title="HTTPS POST" %}

```bash
curl https://api.blxrbdn.com \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: <YOUR-AUTHORIZATION-HEADER>" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "bsc_private_tx",
    "params": {
      "transaction": "f86b0184...e0b58219",
      "mev_builders": ["all"],
      "backrunme_reward_address": "0xYourRewardAddressHere"
    }
  }'

```

{% endtab %}

{% tab title="wscat" %}

```bash
wscat -c wss://api.blxrbdn.com/ws --header "Authorization: <YOUR-AUTHORIZATION-HEADER>" --no-check
> {"jsonrpc":"2.0","id":1,"method":"bsc_private_tx","params":{"transaction":"f86b0184...e0b58219","mev_builders":["all"],"backrunme_reward_address":"0xYourRewardAddressHere"}}

```

{% endtab %}
{% endtabs %}

#### Response

| Result Field  | Description      |
| ------------- | ---------------- |
| **`tx_hash`** | Transaction hash |

{% tabs %}
{% tab title="Cloud-API" %}

```bash
{
    "jsonrpc": "2.0", 
    "id": "1", 
    "result": "0xffd59870844e5...bfa54a69"        
}   
```

{% endtab %}
{% endtabs %}