Get best bid/ask price and quantity for a symbol or all symbols. Useful for spread analysis.
AI agents call bn_book_ticker to retrieve information from Node2flow/binance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns current market pricing information from the Binance exchange. It has no side effects, does not execute trades, does not commit funds, and does not modify any state. It is a straightforward data retrieval operation that falls clearly into the Read category with low risk.
From the tool's definition Tool retrieves best bid/ask price and quantity data (market data query); described as useful for 'spread analysis' which is a read-only analytical operation. No modification, deletion, or financial commitment capability.
Attacks that exploit this kind of access
Get best bid/ask price and quantity for a symbol or all symbols. Useful for spread analysis. It is categorised as a Read tool in the Node2flow/binance MCP Server, which means it retrieves data without modifying state.
Register the Node2flow/binance MCP server in PolicyLayer and add a rule for bn_book_ticker: 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 Node2flow/binance. Nothing to install.
bn_book_ticker 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 bn_book_ticker 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 bn_book_ticker. 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.
bn_book_ticker is provided by the Node2flow/binance MCP server (node2flow-th/binance-mcp-community). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
bn_book_ticker is one line of Node2flow/binance's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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