Crypto Fear & Greed Index (0=extreme fear, 100=extreme greed) with optional history
AI agents call fear_greed_index to retrieve information from AgentPay x402 — Economic-intelligence layer for AI Agents without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure data retrieval tool that queries and returns the Fear & Greed Index metric, optionally with historical records. No side effects, no code execution, no financial transactions, no data modification. While the broader server handles payments, this specific tool only reads sentiment data.
From the tool's definition Tool retrieves Crypto Fear & Greed Index values (0-100 scale) with optional historical data. The description contains 'retrieve' semantics with no modification, deletion, or execution capabilities mentioned. It queries a public sentiment indicator.
Attacks that exploit this kind of access
Crypto Fear & Greed Index (0=extreme fear, 100=extreme greed) with optional history. It is categorised as a Read tool in the AgentPay x402 — Economic-intelligence layer for AI Agents MCP Server, which means it retrieves data without modifying state.
Register the AgentPay x402 — Economic-intelligence layer for AI Agents MCP server in PolicyLayer and add a rule for fear_greed_index: 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 AgentPay x402 — Economic-intelligence layer for AI Agents. Nothing to install.
fear_greed_index 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 fear_greed_index 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 fear_greed_index. 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.
fear_greed_index is provided by the AgentPay x402 — Economic-intelligence layer for AI Agents MCP server (romudille-bit/agentpay). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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