pm_buy

THE RISK

Critical Risk

Why pm_buy needs a policy

This tool executes a financial transaction by purchasing outcome tokens on a prediction market (Polymarket), committing real cryptocurrency funds. This directly involves financial obligations and asset transfers, making it Financial category. Severity is high because an AI agent could misuse this to spend significant funds on prediction market positions that may become worthless.

From the tool's definition Buy outcome tokens on Polymarket prediction market

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

POLICY

How to control pm_buy

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_buy:

policy.json

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

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

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.

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FAQ

Questions about pm_buy

What does the pm_buy tool do? +

Buy outcome tokens on Polymarket prediction market. It is categorised as a Financial tool in the Waiaas MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on pm_buy? +

Register the Waiaas MCP server in PolicyLayer and add a rule for pm_buy: 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_buy? +

pm_buy 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 pm_buy? +

Yes. Add a rate_limit block to the pm_buy 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_buy completely? +

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

pm_buy 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.

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