execute_swap

THE RISK

Critical Risk

This tool executes a token swap on a decentralized exchange, which directly moves cryptocurrency assets between tokens. This constitutes a financial transaction with real monetary value. Misuse could result in significant financial loss through unfavorable trades, and the action is effectively irreversible once submitted to the blockchain.

From the tool's definition Execute a token swap on a DEX

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

HOW TO CONTROL EXECUTE_SWAP

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 execute_swap:

policy.json

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

Any call to execute_swap 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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Go deeper

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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 execute_swap tool do? +

Execute a token swap on a DEX. 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 execute_swap? +

Register the BNB Chain MCP server in PolicyLayer and add a rule for execute_swap: 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 execute_swap? +

execute_swap 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 execute_swap? +

Yes. Add a rate_limit block to the execute_swap 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 execute_swap completely? +

Set action: deny in the PolicyLayer policy for execute_swap. 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 execute_swap? +

execute_swap 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 EXECUTE_SWAP ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL EXECUTE_SWAP

// EXPLORE