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The Private Mempool stream gives you exclusive access to transactions submitted through BlockRazor’s RPC endpoints that have not yet been broadcast to the public peer-to-peer network. Because these transactions are routed privately through BlockRazor’s infrastructure, they arrive at your listener before they become visible in the public mempool — providing a meaningful latency and information advantage for searchers, MEV bots, and quantitative trading systems. The stream is available on both BSC and Ethereum at $1,000 per month.
The Private Mempool surfaces BlockRazor RPC orderflow — real user transactions submitted with MEV protection. These are not synthetic or simulated; they represent genuine pending activity that never touches the public P2P layer until block inclusion or expiration.

​
Connection Details

PropertyValue
ProtocolWebSocket (WSS)
Pricing$1,000 / month
ChainsBNB Smart Chain (BSC), Ethereum

​
Endpoints

wss://mempool.blockrazor.io/bsc/private?auth=YOUR_AUTH_TOKEN
Replace YOUR_AUTH_TOKEN with the API token from your BlockRazor dashboard. A single subscription grants access to both chain endpoints at the same pricing tier.

​
Authentication

Append your token as a query parameter when establishing the WebSocket connection. No additional handshake is needed — the server starts streaming private pending transactions immediately after authentication succeeds. 
wss://mempool.blockrazor.io/bsc/private?auth=YOUR_AUTH_TOKEN

​
Code Examples

Connect and process private mempool events using the WebSocket client for your preferred chain: 
const WebSocket = require('ws');

const ws = new WebSocket(
  'wss://mempool.blockrazor.io/bsc/private?auth=YOUR_AUTH_TOKEN'
);

ws.on('open', () => console.log('Connected to BSC Private Mempool'));

ws.on('message', (data) => {
  const tx = JSON.parse(data);
  console.log(
    'Private pending tx:', tx.hash,
    'from:', tx.from,
    'to:', tx.to
  );
});

ws.on('error', (err) => console.error('WebSocket error:', err));
ws.on('close', () => console.log('Connection closed'));
Monitor tx.gasPrice to quickly filter for high-priority transactions. Private mempool transactions are pre-public and represent the highest-signal events for copy-trading and backrunning strategies.

​
Response Fields

Each message is a JSON object describing a single private pending transaction with the same field schema as the public mempool stream.
​
hash
string
required
The unique 32-byte hex transaction hash (e.g. 0xabc123...).
​
from
string
required
The originating sender address that signed the transaction.
​
to
string
required
The recipient address or target contract. null for contract-creation transactions.
​
value
string
required
Native token value transferred, hex-encoded in wei (BNB for BSC, ETH for Ethereum).
​
gas
string
required
Sender-specified gas limit for the transaction, hex-encoded integer.
​
gasPrice
string
required
Gas price offered by the sender in wei, hex-encoded. For EIP-1559 transactions on Ethereum, this reflects the effective gas price.
​
data
string
required
ABI-encoded calldata. "0x" for plain transfers; contains function selector and arguments for contract interactions.

​
Example Message

{
  "hash": "0x9e1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a",
  "from": "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
  "to": "0x10ED43C718714eb63d5aA57B78B54704E256024E",
  "value": "0x0",
  "gas": "0x55730",
  "gasPrice": "0x1DCD65000",
  "data": "0x7ff36ab5000000000000000000000000000000000000000000000000002386f26fc10000"
}

​
Pricing & Discounts

Subscription PeriodDiscount
1 month—
3 months5% off
6 months10% off
9 months15% off
12 months20% off

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