Get the midpoint price for a Polymarket token (average of best bid and ask).
AI agents call get_midpoint to retrieve information from Polymarket MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and calculates a market price metric (midpoint of bid-ask spread) from existing market data. It performs no write, modification, deletion, code execution, or financial transaction. The operation is idempotent and has no persistent effects on the system or data. Severity is low because accessing public market price data poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name 'get_midpoint' and description 'Get the midpoint price for a Polymarket token (average of best bid and ask)' indicate a pure retrieval operation. Server description emphasizes 'read access' and 'analyze events' without side effects.
Attacks that exploit this kind of access
Get the midpoint price for a Polymarket token (average of best bid and ask). It is categorised as a Read tool in the Polymarket MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for get_midpoint: 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.
get_midpoint is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_midpoint 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 get_midpoint. 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.
get_midpoint is provided by the Polymarket MCP Server MCP server (yigitabi5444/yigit_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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