Check if Binance.US system is under maintenance. Status 0 = normal, 1 = system maintenance. Requires API key authentication.
AI agents call binance_us_system_status 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 is a read-only operation that queries system status information with no side effects. While it requires API authentication, the action is purely informational and does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal—an attacker could only determine system availability, which is low-value information that may be publicly disclosed anyway.
From the tool's definition Tool performs a status check ('Check if Binance.US system is under maintenance') and returns status information without modifying any data. Description explicitly states it retrieves a status value (0 or 1) using API key authentication.
Documented attack patterns abuse exactly the kind of access binance_us_system_status 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_system_status:
{
"version": "1",
"default": "deny",
"tools": {
"binance_us_system_status": {}
}
}binance_us_system_status is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check if Binance.US system is under maintenance. Status 0 = normal, 1 = system maintenance. Requires API key authentication. 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_system_status: 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_system_status 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_system_status 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_system_status. 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_system_status 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.