fetch_ohlcv

THE RISK

Low Risk

Why fetch_ohlcv needs a policy

This tool only retrieves historical market data (price and volume candlesticks) for a trading symbol. It has no side effects, does not modify any state, and does not interact with orders or balances. Pure read operation with minimal blast radius.

From the tool's definition Fetches historical Open-High-Low-Close-Volume (OHLCV) candlestick data

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

POLICY

How to control fetch_ohlcv

PolicyLayer is an MCP gateway — it sits between your AI agents and CCXT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_ohlcv:

policy.json

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

fetch_ohlcv 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 CCXT 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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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 fetch_ohlcv

What does the fetch_ohlcv tool do? +

Fetches historical Open-High-Low-Close-Volume (OHLCV) candlestick data for a specific trading symbol and timeframe. It is categorised as a Read tool in the CCXT MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on fetch_ohlcv? +

Register the CCXT MCP Server MCP server in PolicyLayer and add a rule for fetch_ohlcv: 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 CCXT MCP Server. Nothing to install.

What risk level is fetch_ohlcv? +

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

Can I rate-limit fetch_ohlcv? +

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

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

fetch_ohlcv is provided by the CCXT MCP Server MCP server (jcwleo/ccxt-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CCXT MCP Server tool call.

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

CHECK YOUR STACK →