get_historical_fng_tool

WHAT IT DOES

What get_historical_fng_tool does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents call get_historical_fng_tool 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 get_historical_fng_tool needs a policy

This tool queries and retrieves historical Fear & Greed Index data for a specified time period. It performs a read-only operation with no capability to modify, delete, execute code, or commit financial transactions. The data retrieved is informational only and useful for analysis. The blast radius of misuse is minimal—an agent could only retrieve historical market sentiment data, which cannot cause harm.

From the tool's definition Tool name includes 'get_historical' and description states 'Get historical Fear & Greed Index' — purely retrieves past data without modification or side effects.

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

POLICY

How to control get_historical_fng_tool

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 get_historical_fng_tool:

policy.json

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

get_historical_fng_tool 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_historical_fng_tool

What does the get_historical_fng_tool tool do? +

Get historical Fear & Greed Index for specified number of days as a tool. 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 get_historical_fng_tool? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for get_historical_fng_tool: 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 get_historical_fng_tool? +

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

Can I rate-limit get_historical_fng_tool? +

Yes. Add a rate_limit block to the get_historical_fng_tool 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 get_historical_fng_tool completely? +

Set action: deny in the PolicyLayer policy for get_historical_fng_tool. 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 get_historical_fng_tool? +

get_historical_fng_tool 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.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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