Get best bid/ask prices and quantities (top of book).
AI agents call binance_us_ticker_book to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves real-time or snapshot market data (bid/ask pricing information) from Binance US. It is a pure read operation with no side effects—it does not execute trades, move funds, modify data, or trigger state changes. While the data relates to financial markets, the tool itself does not commit financial obligations or execute transactions.
From the tool's definition Tool name 'binance_us_ticker_book' and description 'Get best bid/ask prices and quantities (top of book)' indicate retrieval of market data without any modification, creation, deletion, or financial transaction.
Documented attack patterns abuse exactly the kind of access binance_us_ticker_book gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for binance_us_ticker_book:
{
"version": "1",
"default": "deny",
"tools": {
"binance_us_ticker_book": {}
}
}binance_us_ticker_book is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get best bid/ask prices and quantities (top of book). It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for binance_us_ticker_book: 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 BNB Chain MCP. Nothing to install.
binance_us_ticker_book 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 binance_us_ticker_book 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 binance_us_ticker_book. 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.
binance_us_ticker_book is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.