binance_us_close_listen_key

THE RISK

Medium Risk

Why binance_us_close_listen_key needs a policy

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.

Documented attack patterns abuse exactly the kind of access binance_us_close_listen_key gives an agent:

POLICY

How to control binance_us_close_listen_key

PolicyLayer is an MCP gateway — it sits between your AI agents and Binance US MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for binance_us_close_listen_key:

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"
        }
      ]
    }
  }
}

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.

Create a free account and register Binance US MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

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Financial binance_us_cancel_replace Cancel an existing order and place a new order on the same symbol atomically. This is usef Financial binance_us_cust_new_order Place a new trade order through the custodial solution. ⚠️ REQUIRES CUSTODIAL SOLUTION AP Financial binance_us_new_oco Place a new OCO (One-Cancels-the-Other) order on Binance.US. OCO orders combine a limit or Financial binance_us_new_order Place a new trade order on Binance.US. Supports LIMIT, MARKET, STOP_LOSS, STOP_LOSS_LIMIT, Financial binance_us_cl_transfer Transfer assets in or out of your credit line account. ⚠️ REQUIRES CREDIT LINE API KEY - Financial binance_us_cust_transfer Transfer assets from custodial partner account to Binance.US custodial sub-account. ⚠️ RE Financial binance_us_cust_undo_transfer Undo a previous transfer from your custodial partner. ⚠️ REQUIRES CUSTODIAL SOLUTION API Financial binance_us_cust_wallet_transfer Transfer assets from Binance.US exchange wallet to custodial sub-account. ⚠️ REQUIRES CUS

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

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.

Enforce policy on every Binance US MCP Server tool call.

Start from Binance US 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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