subscribeSpreadExecution

THE RISK

Low Risk

Why subscribeSpreadExecution needs a policy

The tool subscribes to a real-time data stream for spread execution events. Subscribing to a WebSocket feed is a read/monitoring operation with no side effects on orders, positions, or funds. The authentication requirement ('需要鉴权') is for access control, not because it modifies state. Severity is low since misuse only results in receiving market data.

From the tool's definition 订阅 Spread 成交推送 — 'subscribe' and '推送' (push/stream) indicate this is a data subscription for receiving spread execution updates

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

POLICY

How to control subscribeSpreadExecution

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 subscribeSpreadExecution:

policy.json

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

subscribeSpreadExecution 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.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about subscribeSpreadExecution

What does the subscribeSpreadExecution tool do? +

订阅 Spread 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 subscribeSpreadExecution? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for subscribeSpreadExecution: 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 subscribeSpreadExecution? +

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

Can I rate-limit subscribeSpreadExecution? +

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

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

subscribeSpreadExecution 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.

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