Calculate expected value + Kelly sizing for a Polymarket bet.
AI agents use calculate_ev to commit financial operations through Polymarket MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool performs financial calculations (expected value and Kelly criterion sizing) specifically for placing bets on Polymarket. While it may only compute recommendations rather than execute trades directly, it is explicitly designed to guide financial betting decisions on a real money prediction market.
From the tool's definition 'Calculate expected value + Kelly sizing for a Polymarket bet' — directly calculates financial bet sizing on a prediction market platform
Attacks that exploit this kind of access
Calculate expected value + Kelly sizing for a Polymarket bet. It is categorised as a Financial tool in the Polymarket MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for calculate_ev: 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 Polymarket MCP Server. Nothing to install.
calculate_ev is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the calculate_ev 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.
Set action: deny in the PolicyLayer policy for calculate_ev. 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.
calculate_ev is provided by the Polymarket MCP Server MCP server (miles0sage/polymarket-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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