market_get_fear_greed_historical

WHAT IT DOES

What market_get_fear_greed_historical does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents call market_get_fear_greed_historical to retrieve information from Sperax Ecosystem Crypto & DeFI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why market_get_fear_greed_historical needs a policy

This tool retrieves historical market sentiment data (Fear & Greed Index) without any capability to modify, delete, execute code, or commit financial transactions. It is a pure data query with no side effects. The blast radius of misuse is minimal—an agent could only retrieve publicly available historical data, which poses no security risk.

From the tool's definition Tool name and description indicate data retrieval: 'Get historical Fear & Greed Index data for specified number of days'. The verb 'Get' and the focus on fetching historical index data with no modification capability demonstrate a read-only operation.

Documented attack patterns abuse exactly the kind of access market_get_fear_greed_historical gives an agent:

POLICY

How to control market_get_fear_greed_historical

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for market_get_fear_greed_historical:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "market_get_fear_greed_historical": {}
  }
}

market_get_fear_greed_historical is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Sperax Ecosystem Crypto & DeFI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about market_get_fear_greed_historical

What does the market_get_fear_greed_historical tool do? +

Get historical Fear & Greed Index data for specified number of days. It is categorised as a Read tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on market_get_fear_greed_historical? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for market_get_fear_greed_historical: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is market_get_fear_greed_historical? +

market_get_fear_greed_historical is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit market_get_fear_greed_historical? +

Yes. Add a rate_limit block to the market_get_fear_greed_historical 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.

How do I block market_get_fear_greed_historical completely? +

Set action: deny in the PolicyLayer policy for market_get_fear_greed_historical. 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.

What MCP server provides market_get_fear_greed_historical? +

market_get_fear_greed_historical is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.