send_private_transaction

THE RISK

Critical Risk

This tool sends blockchain transactions using Flashbots Protect RPC. Sending transactions on a blockchain is a financial operation — it can transfer tokens/assets, interact with DeFi contracts, or commit financial obligations. The Flashbots context confirms it's executing real on-chain transactions with real financial value. Misuse could result in irreversible loss of funds, making it critical severity.

From the tool's definition Send a transaction via Flashbots Protect RPC to avoid MEV extraction (frontrunning, sandwich attacks)

Documented attack patterns abuse exactly the kind of access send_private_transaction gives an agent:

HOW TO CONTROL SEND_PRIVATE_TRANSACTION

PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for send_private_transaction:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_private_transaction": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to send_private_transaction is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register BNB Chain MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

GATE THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1240 BNB Chain MCP tools →

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All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
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FAQ

What does the send_private_transaction tool do? +

Send a transaction via Flashbots Protect RPC to avoid MEV extraction (frontrunning, sandwich attacks). It is categorised as a Financial tool in the BNB Chain MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on send_private_transaction? +

Register the BNB Chain MCP server in PolicyLayer and add a rule for send_private_transaction: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches BNB Chain MCP. Nothing to install.

What risk level is send_private_transaction? +

send_private_transaction is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit send_private_transaction? +

Yes. Add a rate_limit block to the send_private_transaction rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block send_private_transaction completely? +

Set action: deny in the PolicyLayer policy for send_private_transaction. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides send_private_transaction? +

send_private_transaction is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BNB Chain MCP tool call.

Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT SEND_PRIVATE_TRANSACTION ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL SEND_PRIVATE_TRANSACTION

// EXPLORE