binance_us_close_listen_key

Close a User Data Stream by invalidating the listen key. Use this when you

SERVERBinance US MCP Server SOURCEnirholas/binance-us-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/nirholas-binance-us-mcp/binance-us-close-listen-key.md

WHAT IT DOES

What binance_us_close_listen_key does on Binance US MCP Server

AI agents use binance_us_close_listen_key to create or update resources in Binance US MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Binance US MCP Server environment.

RISK

Why binance_us_close_listen_key is rated Medium

This tool modifies system state by terminating an authenticated session stream rather than retrieving data (Read) or executing trades (Financial/Execute). While not destructive in the sense of deleting persistent data, invalidating a listen key is a state-changing operation that affects an active connection. It could disrupt legitimate monitoring if misused, but the blast radius is limited to the specific stream.

From the tool's definition 'Close a User Data Stream by invalidating the listen key' — invalidates/revokes an authentication credential, which modifies the state of an active stream connection.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs binance_us_close_listen_key safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Binance US MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For binance_us_close_listen_key, this is the rule to start with:

binance_us_close_listen_key Rate-limited

binance_us_close_listen_key stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "binance_us_close_listen_key": {
      "limits": [
        {
          "counter": "binance_us_close_listen_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Binance US MCP Server, apply this rule, and every binance_us_close_listen_key call is checked against it from then on.

FAQ

Questions about binance_us_close_listen_key

What does the binance_us_close_listen_key tool do? +

Close a User Data Stream by invalidating the listen key. Use this when you. It is categorised as a Write tool in the Binance US MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on binance_us_close_listen_key? +

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

What risk level is binance_us_close_listen_key? +

binance_us_close_listen_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit binance_us_close_listen_key? +

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

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

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

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