subscribeSpreadTickers

THE RISK

Low Risk

Why subscribeSpreadTickers needs a policy

This tool subscribes to real-time market data streams (spread tickers) from Bybit. It is a read-only operation that retrieves market information with no side effects on accounts, positions, or financial obligations. While it establishes a WebSocket stream, the action itself is non-destructive data retrieval. Severity is low as misuse would only expose the agent to market data already publicly available.

From the tool's definition Tool name 'subscribeSpreadTickers' and description '订阅 Spread 行情快照' (Subscribe to Spread market data snapshots) indicate real-time market data subscription. The 'subscribe' operation retrieves live ticker data without modifying state.

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

POLICY

How to control subscribeSpreadTickers

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 subscribeSpreadTickers:

policy.json

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

subscribeSpreadTickers 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 subscribeSpreadTickers

What does the subscribeSpreadTickers tool do? +

订阅 Spread 行情快照. 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 subscribeSpreadTickers? +

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

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

Can I rate-limit subscribeSpreadTickers? +

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

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

subscribeSpreadTickers 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 →