BlockRazor for MEV Searchers: Arbitrage and Backrunning

MEV searching is an unforgiving discipline. Capturing an arbitrage opportunity, executing a profitable backrun, or landing a snipe ahead of the competition demands the earliest possible view of pending orderflow, the ability to execute transactions atomically, and a direct path to the validators building the next block. BlockRazor’s infrastructure stack is designed end-to-end for this workflow: private mempool access feeds your detection layer, Bundle mode handles atomic execution, and the BlockRazor Block Builder — responsible for 37% of historical block production on BSC — maximises the probability your bundle lands.

Why searchers choose BlockRazor

Private Mempool Stream

Subscribe to BlockRazor’s private orderflow stream — pending transactions submitted via the BlockRazor RPC — to see signal opportunities before they reach the public mempool.

Bundle Submission

Submit atomic bundles that execute alongside a target transaction in the same block. Supports both project-builder and Searcher bid modes on BSC and Ethereum.

Block Builder

Submit bundles directly to the BlockRazor Block Builder, which holds a 37% cumulative block production rate on BSC — the highest of any builder on the chain.

Core benefits

Earliest signal with private orderflow

The Private Mempool stream delivers transactions that users have submitted via the BlockRazor RPC endpoint. Because these transactions travel through BlockRazor’s protected relay rather than the public P2P network, you observe them earlier and with less competition than you would from a public mempool feed. This is the signal source for arbitrage detection, backrun construction, and snipe targeting.

Atomic execution with Bundle mode

Once you have identified a target transaction, Bundle mode lets you submit a set of transactions that must land in the same block, in a defined order, immediately after the target. If the bundle cannot be placed, it is not included at all — eliminating the risk of partial execution where your transaction fires without the expected context. On BSC, use eth_sendMevBundle in Searcher mode; on Ethereum, use eth_sendBid.

Direct Block Builder connectivity for maximum win rate

Submitting through the BlockRazor Block Builder bypasses general validator gossip and places your bundle directly in the hands of the builder that wins the most blocks on BSC. With a 37% historical block production rate — first across the entire BSC chain — the BlockRazor Block Builder gives your bundles the highest realistic probability of landing in the target block.

Chain and service matrix

Use Case	Required Service	Supported Chains
Signal detection	Private Mempool Stream	BSC, Ethereum
Backrunning	Bundle (Searcher) + Block Builder	BSC, Ethereum
Arbitrage	Bundle (Searcher) + Block Builder	BSC, Ethereum
Token sniping	Bundle (Searcher)	BSC, Ethereum
Bundle simulation	Call Bundle (Block Builder)	BSC

Private Mempool access ($1,000/month) covers both BSC and Ethereum orderflow. See the pricing page for full subscription details and bundle options for BSC-focused searchers.

Integration patterns

Private Mempool Stream
Bundle — Searcher Bid (BSC)
Bundle — Searcher Bid (Ethereum)

Connect to the Private Mempool WebSocket stream to receive RPC orderflow in real time. Each message contains a fully formed pending transaction that arrived via the BlockRazor protected RPC.

const ws = new WebSocket(
  "wss://stream.blockrazor.io/bsc/<api-key>/private-mempool"
);

ws.on("message", (data) => {
  const { tx } = JSON.parse(data);
  // Decode and evaluate for arbitrage / backrun opportunities
  const opportunity = analyze(tx);
  if (opportunity) submitBundle(opportunity);
});

Submit a bid bundle using eth_sendMevBundle in Searcher mode. Your bid competes in the orderflow auction run by the BlockRazor Block Builder.

curl -X POST https://rpc.blockrazor.io/bsc/<api-key>/bundle \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendMevBundle",
    "params": [{
      "txs": ["0x<signal_tx_hex>", "0x<searcher_tx_hex>"],
      "blockNumber": "0x<target_block>",
      "minTimestamp": 0,
      "maxTimestamp": 0,
      "revertingTxHashes": []
    }],
    "id": 1
  }'

On Ethereum, use eth_sendBid to submit your bundle to the BlockRazor relay for inclusion by a compatible block builder.

curl -X POST https://rpc.blockrazor.io/eth/<api-key>/bundle \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendBid",
    "params": [{
      "txs": ["0x<signal_tx_hex>", "0x<searcher_tx_hex>"],
      "blockNumber": "0x<target_block>"
    }],
    "id": 1
  }'

Use the Call Bundle method on BSC to simulate your bundle against the current block state before committing a live bid. This lets you validate profitability and catch revert conditions without spending gas on failed attempts.

Recommended services

Private Mempool Stream

Subscribe to BlockRazor RPC orderflow for the earliest view of signal transactions on BSC and Ethereum.

Bundle Submission

Atomic bundle execution in Searcher bid mode for backrunning and arbitrage on BSC and Ethereum.

Block Builder

Direct submission to the BSC Block Builder with a 37% historical block production rate.

Get Started

Use Cases

Transaction Submission

Streams

Block Builder

BlockRazor for MEV Searchers: Arbitrage and Backrunning

Why searchers choose BlockRazor

Private Mempool Stream

Bundle Submission

Block Builder

Core benefits

Chain and service matrix

Integration patterns

Recommended services

Private Mempool Stream

Bundle Submission

Block Builder

Build docs developers (and LLMs) love

Get Started

Use Cases

Transaction Submission

Streams

Block Builder

Documentation Index

​Why searchers choose BlockRazor

Private Mempool Stream

Bundle Submission

Block Builder

​Core benefits

​Chain and service matrix

​Integration patterns

​Recommended services

Private Mempool Stream

Bundle Submission

Block Builder

Build docs developers (and LLMs) love

Why searchers choose BlockRazor

Core benefits

Chain and service matrix

Integration patterns

Recommended services