get_market_stats

THE RISK

Low Risk

Why get_market_stats needs a policy

This tool performs data retrieval only. Put/call ratios and sentiment indicators are passive metrics calculated from existing market data. There are no side effects, no financial transactions, no code execution, and no data modification. It is analogous to a market data query or fetch operation.

From the tool's definition Tool retrieves 'market-wide put/call ratios and sentiment indicators'—querying existing market data with no modification, creation, deletion, or execution of trades.

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

POLICY

How to control get_market_stats

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_market_stats": {}
  }
}

get_market_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_market_stats

What does the get_market_stats tool do? +

Market-wide put/call ratios and sentiment indicators. It is categorised as a Read tool in the Momentum MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_market_stats? +

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

What risk level is get_market_stats? +

get_market_stats is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_market_stats? +

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

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

get_market_stats is provided by the Momentum MCP server (mphinance/momentum-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Momentum tool call.

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

CHECK YOUR STACK →