Time-series price (implied-probability) history for a Polymarket outcome token. Pass the CLOB token id and an interval (1h, 6h, 1d, 1w, 1m, max). Returns timestamped price points — for charting how a market
AI agents call predict.price-history to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves time-series price history data from Polymarket for visualization/analysis purposes. It is a query operation that fetches existing data with no side effects, no code execution, no financial transactions, and no data modification or deletion. Despite the server's focus on financial settlement infrastructure, this specific tool only reads market data.
From the tool's definition Tool description states it 'Returns timestamped price points — for charting how a market', indicating retrieval of historical price data without modification, deletion, or execution of trades.
Attacks that exploit this kind of access
Time-series price (implied-probability) history for a Polymarket outcome token. Pass the CLOB token id and an interval (1h, 6h, 1d, 1w, 1m, max). Returns timestamped price points — for charting how a market. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for predict.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 Mcp. Nothing to install.
predict.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 predict.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 predict.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.
predict.price-history is provided by the MCP server (@2sio/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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