get_midpoint
AI agents call get_midpoint to retrieve information from Polymarket without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves market data (likely the midpoint price in an order book) without modifying, deleting, or executing external operations. No side effects are evident. The empty description reduces confidence slightly, but context from the server's stated read-only purpose and naming pattern of sibling tools strongly supports Read classification.
From the tool's definition Tool is part of a 'read-only interface' server per the server description. Name 'get_midpoint' suggests retrieval of a pricing midpoint value. Sibling tools (get_price, get_price_history, get_book, etc.) are all query/retrieval operations with no side effects.
Attacks that exploit this kind of access
get_midpoint. It is categorised as a Read tool in the Polymarket MCP Server, which means it retrieves data without modifying state.
Register the Polymarket 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. 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 (pr1m8/polymarket-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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