subscribeSpreadPublicTrade

THE RISK

Low Risk

Why subscribeSpreadPublicTrade needs a policy

This tool subscribes to read-only WebSocket streams of public trade data. It retrieves real-time market information about spread trades but does not execute trades, modify account state, or move funds. The 'subscribe' verb in this context means establishing a data listener rather than executing an action with side effects.

From the tool's definition Tool name 'subscribeSpreadPublicTrade' indicates subscription to public trade data streams. The description '订阅 Spread 成交数据' translates to 'Subscribe to Spread transaction/trade data'.

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

POLICY

How to control subscribeSpreadPublicTrade

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 subscribeSpreadPublicTrade:

policy.json

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

subscribeSpreadPublicTrade 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.
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 subscribeSpreadPublicTrade

What does the subscribeSpreadPublicTrade tool do? +

订阅 Spread 成交数据. 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 subscribeSpreadPublicTrade? +

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

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

Can I rate-limit subscribeSpreadPublicTrade? +

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

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

subscribeSpreadPublicTrade 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 →