getEarnAprHistory

THE RISK

Low Risk

Why getEarnAprHistory needs a policy

This tool retrieves historical APR (Annual Percentage Rate) data for earn products on the Bybit exchange. It performs a passive data query with no side effects—no positions are modified, no transactions occur, and no data is created or deleted. The blast radius of misuse is minimal since an AI agent could only access or enumerate historical financial metrics already public on the exchange.

From the tool's definition Tool name 'getEarnAprHistory' and description 'Query historical daily APR for a product' indicate data retrieval with no modification. The verb 'Query' and 'get' are characteristic of read operations.

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

POLICY

How to control getEarnAprHistory

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 getEarnAprHistory:

policy.json

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

getEarnAprHistory 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 getEarnAprHistory

What does the getEarnAprHistory tool do? +

Query historical daily APR for a product. Supports. 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 getEarnAprHistory? +

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

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

Can I rate-limit getEarnAprHistory? +

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

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

getEarnAprHistory 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 →