subscribeExecutionFast

THE RISK

Low Risk

Why subscribeExecutionFast needs a policy

The tool subscribes to a real-time WebSocket stream for fast execution updates. Subscribing to a data feed is a read operation with no side effects — it only receives data. The authentication requirement ('需要鉴权') suggests it accesses private account data, but doesn't modify anything. Severity is low as misuse only exposes trade execution data.

From the tool's definition 订阅快速成交推送 — 'subscribe' and 'push notification' indicate this is a read/stream operation that listens for execution events

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

POLICY

How to control subscribeExecutionFast

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

policy.json

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

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

Create a free account and register Bybit 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about subscribeExecutionFast

What does the subscribeExecutionFast tool do? +

订阅快速成交推送（需要鉴权）. It is categorised as a Read tool in the Bybit MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on subscribeExecutionFast? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for subscribeExecutionFast: 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 Bybit MCP Server. Nothing to install.

What risk level is subscribeExecutionFast? +

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

Can I rate-limit subscribeExecutionFast? +

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

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

subscribeExecutionFast is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bybit MCP Server tool call.

Start from Bybit MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →