transfer_erc20

THE RISK

Critical Risk

This tool directly moves financial assets (ERC20 tokens) from one address to another, committing a financial obligation and irreversibly transferring value. This is a financial operation with critical severity due to the potential for unlimited asset loss if an AI agent misuses it or is socially engineered to transfer to attacker-controlled addresses.

From the tool's definition Tool name 'transfer_erc20' and description 'Transfer ERC20 tokens to an address' indicate moving cryptocurrency assets. ERC20 tokens represent financial value on blockchain networks.

Documented attack patterns abuse exactly the kind of access transfer_erc20 gives an agent:

HOW TO CONTROL TRANSFER_ERC20

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 transfer_erc20:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "transfer_erc20": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to transfer_erc20 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.

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EXPLORE

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FAQ

What does the transfer_erc20 tool do? +

Transfer ERC20 tokens to an address. 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 transfer_erc20? +

Register the BNB Chain MCP server in PolicyLayer and add a rule for transfer_erc20: 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 transfer_erc20? +

transfer_erc20 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 transfer_erc20? +

Yes. Add a rate_limit block to the transfer_erc20 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 transfer_erc20 completely? +

Set action: deny in the PolicyLayer policy for transfer_erc20. 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 transfer_erc20? +

transfer_erc20 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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// WHAT TRANSFER_ERC20 ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL TRANSFER_ERC20

// EXPLORE