AI agents call get_klines to retrieve information from Binance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical OHLCV (Open, High, Low, Close, Volume) candlestick data from Binance's public market data. It performs no writes, deletions, executions, or financial transactions. The data queried is publicly available market information. An AI agent misusing this tool could at worst retrieve large volumes of data, causing minor resource consumption, but cannot harm systems or data integrity.
From the tool's definition Tool name is 'get_klines' which retrieves 'historical candlestick data' - a read-only query operation that returns market data without modifying state.
Documented attack patterns abuse exactly the kind of access get_klines gives an agent:
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 get_klines:
{
"version": "1",
"default": "deny",
"tools": {
"get_klines": {}
}
}get_klines is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get historical candlestick data. It is categorised as a Read tool in the Binance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Binance MCP Server MCP server in PolicyLayer and add a rule for get_klines: 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.
get_klines 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 get_klines 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 get_klines. 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.
get_klines is provided by the Binance MCP Server MCP server (qeinfinity/binance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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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6 Binance MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.