pm_approve_ctf

THE RISK

Medium Risk

Why pm_approve_ctf needs a policy

This tool modifies token approval permissions on-chain, allowing the Polymarket Exchange contract to transfer CTF tokens on behalf of the user. While reversible (approvals can be revoked), it is a Write operation that changes authorization state.

From the tool's definition Approve CTF ERC-1155 tokens for Polymarket Exchange contract - 'approve' is a reversible state change that grants spending permissions to a contract

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

POLICY

How to control pm_approve_ctf

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pm_approve_ctf": {
      "limits": [
        {
          "counter": "pm_approve_ctf_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

pm_approve_ctf stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about pm_approve_ctf

What does the pm_approve_ctf tool do? +

Approve CTF ERC-1155 tokens for Polymarket Exchange contract. It is categorised as a Write tool in the Waiaas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pm_approve_ctf? +

Register the Waiaas MCP server in PolicyLayer and add a rule for pm_approve_ctf: 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 Waiaas. Nothing to install.

What risk level is pm_approve_ctf? +

pm_approve_ctf is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pm_approve_ctf? +

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

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

pm_approve_ctf is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Waiaas tool call.

Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →