Get historical price data for a market. Shows how odds have changed over time.
AI agents call get_price_history 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 queries and retrieves historical price/odds data from Polymarket prediction markets. It is a passive data retrieval operation that does not modify state, execute code, delete data, or involve financial transactions. The worst-case misuse (flooding requests) is mitigated by API rate limiting and causes no lasting harm. Therefore it is classified as Read with low severity.
From the tool's definition Tool name 'get_price_history' and description 'Get historical price data for a market. Shows how odds have changed over time.' indicate data retrieval with no side effects. Returns read-only market data without modification, creation, or deletion.
Attacks that exploit this kind of access
Get historical price data for a market. Shows how odds have changed over time. 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_price_history: 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_price_history 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_price_history 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_price_history. 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_price_history is provided by the Polymarket MCP Server MCP server (rafael-pina/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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