create_permit_signature

THE RISK

High Risk

Creating a permit signature generates a cryptographic authorization that allows a third party to spend tokens on behalf of the signer without requiring a separate on-chain approval transaction. While signing itself is not a financial transaction, it creates a binding cryptographic authorization that can be used to drain tokens — similar in blast radius to a token approval.

From the tool's definition Create an EIP-2612 permit signature for gasless token approvals

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

HOW TO CONTROL CREATE_PERMIT_SIGNATURE

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 create_permit_signature:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_permit_signature": {
      "limits": [
        {
          "counter": "create_permit_signature_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

create_permit_signature stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in BNB Chain MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

What does the create_permit_signature tool do? +

Create an EIP-2612 permit signature for gasless token approvals. It is categorised as a Execute tool in the BNB Chain MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on create_permit_signature? +

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

create_permit_signature is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit create_permit_signature? +

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

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

create_permit_signature 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.

GOVERN BNB CHAIN →

Free to start. No card required.

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

// WHAT CREATE_PERMIT_SIGNATURE ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL CREATE_PERMIT_SIGNATURE

// EXPLORE