subscribe_to_book_ticker_stream

THE RISK

Low Risk

Why subscribe_to_book_ticker_stream needs a policy

This tool subscribes to a data stream for real-time book ticker information (best bid/ask prices). Book ticker subscriptions are read operations that retrieve public market data without modifying state, executing code, or affecting financial positions. The pattern of sibling read-only market data tools strongly suggests this follows the same read-only paradigm.

From the tool's definition Tool name 'subscribe_to_book_ticker_stream' indicates subscription to market data stream. Sibling tools (get_book_ticker, get_24hr_ticker, get_aggregate_trades, etc.) are all read-only market data retrieval functions.

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

POLICY

How to control subscribe_to_book_ticker_stream

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

policy.json

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

subscribe_to_book_ticker_stream 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 Binance 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

Related tools and policies

More Binance MCP Server tools

Execute subscribe_to_trade_stream subscribe_to_trade_stream Write unsubscribe_from_stream Unsubscribe from a WebSocket stream. Read cleanup_all_streams Close all active WebSocket connections and clean up resources. Read get_24hr_ticker get_24hr_ticker Read get_aggregate_trades get_aggregate_trades Read get_all_24hr_tickers get_all_24hr_tickers Read get_all_book_tickers Get the best price/quantity on the order book for all symbols. Read get_all_rolling_window_tickers get_all_rolling_window_tickers

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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 subscribe_to_book_ticker_stream

What does the subscribe_to_book_ticker_stream tool do? +

subscribe_to_book_ticker_stream. It is categorised as a Read tool in the Binance MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on subscribe_to_book_ticker_stream? +

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

What risk level is subscribe_to_book_ticker_stream? +

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

Can I rate-limit subscribe_to_book_ticker_stream? +

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

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

subscribe_to_book_ticker_stream is provided by the Binance MCP Server MCP server (tienan92it/binance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Binance MCP Server tool call.

Start from Binance 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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