Bitcoin Fear & Greed Index — 7-day history with trading signals.
AI agents call crypto_fear_greed 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 displays historical fear & greed index data and trading signals. It has no side effects—it does not execute trades, transfer funds, modify market data, or trigger external operations. While it is part of a financial prediction market platform and may inform trading decisions, the tool itself is purely a data retrieval (Read) function.
From the tool's definition Tool name 'crypto_fear_greed' and description 'Bitcoin Fear & Greed Index — 7-day history with trading signals' indicate retrieval of historical market sentiment data without modification or financial transaction initiation.
Attacks that exploit this kind of access
Bitcoin Fear & Greed Index — 7-day history with trading signals. 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 crypto_fear_greed: 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.
crypto_fear_greed 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 crypto_fear_greed 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 crypto_fear_greed. 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.
crypto_fear_greed is provided by the Polymarket MCP Server MCP server (miles0sage/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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