BinanceOptionsDeleteListenKey

THE RISK

Critical Risk

Why BinanceOptionsDeleteListenKey needs a policy

The tool explicitly deletes a listen key and terminates a user data stream connection. This is an irreversible termination action — once the listen key is deleted and the stream is closed, any active subscriptions or real-time data feeds relying on that key are lost. This maps to Destructive rather than Write because the action cannot be undone (the stream is terminated).

From the tool's definition Close/delete an options listen key. This will terminate the user data stream connection.

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

POLICY

How to control BinanceOptionsDeleteListenKey

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for BinanceOptionsDeleteListenKey:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "BinanceOptionsDeleteListenKey"
  ]
}

BinanceOptionsDeleteListenKey disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Sperax Ecosystem Crypto & DeFI 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.

RESTRICT THIS TOOL →

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EXPLORE

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Go deeper

Critical-risk tools in Sperax Ecosystem Crypto & DeFI MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about BinanceOptionsDeleteListenKey

What does the BinanceOptionsDeleteListenKey tool do? +

Close/delete an options listen key. This will terminate the user data stream connection. It is categorised as a Destructive tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on BinanceOptionsDeleteListenKey? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for BinanceOptionsDeleteListenKey: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is BinanceOptionsDeleteListenKey? +

BinanceOptionsDeleteListenKey is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit BinanceOptionsDeleteListenKey? +

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

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

BinanceOptionsDeleteListenKey is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI 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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