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: 0x6374Ca2da5646C73Eb444aB99780495d61035f9b

2. Include the following field in your submission request payload:

   "mev_builders": ["all"]

Parameters

Parameter	Description	Instructions & Notes
transaction	Raw transactions bytes without 0x prefix.	Mandatory. Learn more about constructing the transaction here.
mev_builders	A list of MEV builders that should receive the transaction without delay.	[Optional, default: bloxroute builder] Possible MEV builders are: bloxroute: bloXroute internal builder all: all builders Other options: 48club, blockrazor, jetbldr, nodereal
backrunme_reward_address	String – valid BSC address specifying where backrun rewards should be shared.	Optional

Examples

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"
    }
  }'

HTTPS POST

wscat

Response

Result Field	Description
tx_hash	Transaction hash

Cloud-API

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