BinancePortfolioMarginCreateListenKey

THE RISK

Low Risk

Why BinancePortfolioMarginCreateListenKey needs a policy

Creating a listen key is an authentication/session initiation step that enables read-only streaming of account data via WebSocket. It does not move funds, modify account state, or execute trades. The 'create' here refers to generating a temporary token, not creating a financial resource. Severity is low as the key only grants read access to data streams.

From the tool's definition Create a listen key for Portfolio Margin user data stream... used to subscribe to account updates via WebSocket

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

POLICY

How to control BinancePortfolioMarginCreateListenKey

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 BinancePortfolioMarginCreateListenKey:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "BinancePortfolioMarginCreateListenKey": {}
  }
}

BinancePortfolioMarginCreateListenKey is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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FAQ

Questions about BinancePortfolioMarginCreateListenKey

What does the BinancePortfolioMarginCreateListenKey tool do? +

Create a listen key for Portfolio Margin user data stream. The listen key is used to subscribe to account updates via WebSocket. It is categorised as a Read tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on BinancePortfolioMarginCreateListenKey? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for BinancePortfolioMarginCreateListenKey: 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 BinancePortfolioMarginCreateListenKey? +

BinancePortfolioMarginCreateListenKey is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit BinancePortfolioMarginCreateListenKey? +

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

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

BinancePortfolioMarginCreateListenKey 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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