Execute market order at best available price using FOK.
AI agents use create_market_order to commit financial operations through Polymarket MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
A market order executes a trade immediately at the best available price with no ability to reverse once filled. FOK (Fill-Or-Kill) means the order either completes fully or not at all, with no partial fills. This directly moves money/assets and commits financial obligations on a prediction market platform.
From the tool's definition 'Execute market order at best available price using FOK' — this directly places a live trading order on Polymarket prediction markets, committing financial resources immediately using Fill-Or-Kill execution.
Attacks that exploit this kind of access
Execute market order at best available price using FOK. 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 create_market_order: 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.
create_market_order 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 create_market_order 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 create_market_order. 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.
create_market_order is provided by the Polymarket MCP Server MCP server (nancheng582-jpg/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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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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