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Explore the services, application scenarios, advantages, quick start, price, endpoint and access methods of BlockRazor BSC Private Mempool.

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BSC Private Mempool Stream Integration Guide

What is BSC Private Mempool

BSC Private Mempool is a private pending transaction service provided by BlockRazor, used to obtain private orderflow from BlockRazor RPC.

Unlike Public Mempool, which subscribes to pending transactions in public distribution, Private Mempool focuses on private transaction data that hasn't entered the public distribution path. This data is pushed via the SSE protocol, allowing users to directly parse, filter, and process it within their strategy systems. Private Mempool performs uniform anonymization on transaction content, disclosing only the transaction fields authorized for public access. This balances data privacy with the retention of critical information needed for strategy analysis.

Scenarios of BSC Private Mempool

Private Mempool is suitable for users who want to monitor, judge, and execute strategies around private orderflows. Common scenarios include backrunning, copy trading, and sniping.

Backrunning: When a trade appears in the private orderflow that may trigger arbitrage opportunities, users can construct a backrun trade based on these signals and execute the strategy after the target trade.
Copy Trading: When target addresses, strategy accounts, or specific types of transactions appear in the private orderflow, users can identify these copy trading signals earlier and build follow strategies around actions such as buying, selling, adding to positions, or adjusting positions.
Sniping: Identify key signals from private orderflow as early as possible when new pools are created, liquidity is injected, tokens open, or specific target trades are about to trigger market changes, providing an earlier response window for quick entry, signal following, and other timing-sensitive strategies.

Why choose BSC Private Mempool?

In the BSC scenario, many high-value transactions do not appear in the public Mempool, but are instead included via a private routing provided by BlockRazor RPC. For users who want to build strategies around these transactions, waiting until the transactions are finally included to capture signals often means missing more valuable processing opportunities.

Private Mempool relies on BEF to provide users in different regions with access to private orderflow, enabling users to conduct earlier analysis and decisions based on the private transactions.

Quick Start

{% stepper %} {% step %} Purchase BSC Private Mempool

Go to the Pricing page to purchase {% endstep %}

{% step %} Apply for Auth

For Details, see Authentication {% endstep %}

{% step %} Subscribe to BSC Private Mempool

For Details, see Request Example {% endstep %}

{% step %} Construct & submit bundle

For Details, see Bundle {% endstep %} {% endstepper %}

Price

The price is $100 / day and $1000 / month. 2 data streams are allowed per region. Subscribe

Endpoint

{% hint style="info" %}

Please keep the domain for subscribing to bundles consistent with the domain for sending bundles. For example, if you subscribe to https://jp-bscscutum.blockrazor.xyz/stream, send bundles to https://jp-bscscutum.blockrazor.xyz.
Private data streams vary across regions. It is recommended to subscribe to all three endpoints simultaneously. {% endhint %}

地區	端點
Tokyo	https://jp-bscscutum.blockrazor.xyz/stream
New York	https://us-bscscutum.blockrazor.xyz/stream
Frankfurt	https://ger-bscscutum.blockrazor.xyz/stream
Dublin	https://ire-bscscutum.blockrazor.xyz/stream

Request Example

curl -X GET \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer <token>" \
    --data '{}' \
    https://jp-bscscutum.blockrazor.xyz/stream

https://jp-bscscutum.blockrazor.xyz/stream?token=<token>

Data Stream Type

Raw Bundle

Raw Bundle refers to the bundle that has not been followed by the strategy transaction. Transactions in Raw Bundle come from two channels.

Transactions submitted through eth_sendRawTransaction will be automatically constructed as a bundle by BlockRazor RPC and pushed to Private Mempool. The Raw Bundle in this scenario only contains one transaction;

For the Raw Bundle submitted through eth_sendMevBundle, the transactions come from the public mempool or are self-constructed. The Raw Bundle in this scenario can contain up to 50 transactions.

Followed Bundle

After the client executes the backrun, coping trading or sniping strategy on Raw Bundle, it can choose to continue to disclose the bundle to Private Mempool to execute the nested backrun strategy. At this time, the bundle disclosed to the Private Mempool is the Followed Bundle, which contains all transactions in Raw Bundle, and one strategy transaction.

Data Stream Structure

Bundle

Patameters	Format	Remark
chainID	string	ETH: 1, BSC:56
hash	string	bundle hash, data streams are pushed uniformly in the form of bundles
txs	[]tx	transactions included in bundle
nextBlockNumber	uint64	the block number where the bundle is going to be included
maxBlockNumber	uint64	the maximum block number valid for this bundle
proxyBidContract	string	proxy contract address of bundle bidding, biding call for detail can be found in Broken link.
refundAddress	string	input parameter of bidding call, the bidding will be refunded to refundAddress in proportion.
refundCfg	int	input parameter of bidding call
state	[]state	state change of state objects in EVM, data stream example

txs

Patameters	Format	Remark
hash	string	transaction hash
from	string	sender of the transaction
to	string	receiver of the transaction
value	hex	value being transacted
nonce	uint64	nonce
calldata	string	calldata
functionSelector	string	the first 4 bytes of the contract function signature hash
logs	[]log	event logs emitted during transaction execution

log

Patameters	Format	Remark
address	string	the smart contract address that triggered the event
topics	[]string	event log topcis
data	string	storage area for non-index data

state

{% hint style="info" %} the default data stream does not contain state field, if you need it, please modify the url of RPC Endpoint to https://jp-bscscutum.blockrazor.xyz/stream?state=true {% endhint %}

Patameters	Format	Remark
"0x7C3b……3cb9E2"	[]string	The address of the state object where the data changes, which can be EOA or smart contract
"0x935b……6cf608"	string	the Key of the changed data in state object
"0x0000……3ffc00"	string	the Value of changed data in state object

Data Stream Example(default)

{
    "chainID":"56" //ETH: 1, BSC:56
    "hash":"0x2ba4c05436d4a48a0ce30341a3164b34b31c091a28ed62618f7b0512aba41f51" // bundle hash
    "txs":[{
          "hash":"0x2ba4c05436d4a48a0ce30341a3164b34b31c091a28ed62618f7b0512aba41f51"
          "from":"0xB4647b856CB9C3856d559C885Bed8B43e0846a47"
          "to":"0x0000000000000000000000000000000000001000"
          "value":"0x1c4eda9192000"
          "nonce":88036
          "calldata":"0xf340fa01000000000000000000000000b4647b856cb9c3856d559c885bed8b43e0846a47"
          "functionSelector":"0xe47d166c"
          "logs":[
              {
                "address": "0x6c1bcf1b99d9f0819459dad661795802d232437e",
                "topics": ["0xc42079f94a6350d7e6235f29174924f928cc2ac818eb64fed8004e115fbcca67", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x0000000000000000000000000000000000000000000000000000000000000000"],
                "data": "0x"
              }
              {
                "address": "0x6c1bcf1b99d9f0819459dad661795802d232437e",
                "topics": ["0xc42079f94a6350d7e6235f29174924f928cc2ac818eb64fed8004e115fbcca67", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x0000000000000000000000000000000000000000000000000000000000000000"],
                "data": "0x"
              }
          ]
    }]
    "nextBlockNumber":39177941  //the block number where the bundle is going to be included
    "maxBlockNumber":39177941  //the maximum block number valid for this bundle
    "proxyBidContract":"0x74Ce839c6aDff544139f27C1257D34944B794605" //bidding contract address, call the contract's proxyBid method to bid
    "refundAddress":"0x6c1bcf1b99d9f0819459dad661795802d232437e", //the bidding amount will be refunded to refundAddress in proportion
    "refundCfg":10380050 //refund configuration
}

Data Stream Example(including state)

{% hint style="info" %} The default data stream does not contain state field, if you need to obtain it, please modify the url of RPC Endpoint to https://bsc.blockrazor.xyz/stream?state=true {% endhint %}

{
    "chainID":"56" //ETH: 1, BSC:56
    "hash":"0x2ba4c05436d4a48a0ce30341a3164b34b31c091a28ed62618f7b0512aba41f51" // bundle hash
    "txs":[{
          "hash":"0x2ba4c05436d4a48a0ce30341a3164b34b31c091a28ed62618f7b0512aba41f51"
          "from":"0xB4647b856CB9C3856d559C885Bed8B43e0846a47"
          "to":"0x0000000000000000000000000000000000001000"
          "value":"0x1c4eda9192000"
          "nonce":88036
          "calldata":"0xf340fa01000000000000000000000000b4647b856cb9c3856d559c885bed8b43e0846a47"
          "functionSelector":"0xe47d166c"
          "logs":[
              {
                "address": "0x6c1bcf1b99d9f0819459dad661795802d232437e",
                "topics": ["0xc42079f94a6350d7e6235f29174924f928cc2ac818eb64fed8004e115fbcca67", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x0000000000000000000000000000000000000000000000000000000000000000"],
                "data": "0x"
              }
              {
                "address": "0x6c1bcf1b99d9f0819459dad661795802d232437e",
                "topics": ["0xc42079f94a6350d7e6235f29174924f928cc2ac818eb64fed8004e115fbcca67", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x0000000000000000000000000000000000000000000000000000000000000000"],
                "data": "0x"
              }
          ]
    }]
    "nextBlockNumber":39177841  //the block number where the bundle is going to be included
    "maxBlockNumber":39177941  //the maximum block number valid for this bundle
    "proxyBidContract":"0x74Ce839c6aDff544139f27C1257D34944B794605" //bidding contract address, call the contract's proxyBid method to bid
    "refundAddress":"0x6c1bcf1b99d9f0819459dad661795802d232437e", //the bidding amount will be refunded to refundAddress in proportion
    "refundCfg":10380050 //refund configuration
    "state": { //state change of state objects
	"0x7C3b00CB3B40Cc77d88329A58574E29cFA3cb9E2": { //The address of the state object where the data changes, which can be EOA or smart contract
	      "0x935b605129a438014d6ae0692623c5e1fbf83d5a631f5a0f8489a301966cf608": "0x00000000000000000000000000000000000000000000010c86a7e418723ffc00"
	      //"the Key of the changed data in state object":"the Value of changed data in state object"
	      }
      }
}

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BSC Private Mempool Stream Integration Guide

Quick Start

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Request Example

Data Stream Type

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Data Stream Structure

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BSC Private Mempool Stream Integration Guide

Quick Start

Price

Endpoint

Request Example

Data Stream Type

Raw Bundle

Followed Bundle

Data Stream Structure

state

Data Stream Example(default)

Data Stream Example(including state)