executePurchase

THE RISK

Critical Risk

Why executePurchase needs a policy

This tool executes a financial transaction by placing a buy order on a cryptocurrency exchange, directly committing funds to purchase tokens. This is a financial operation with critical severity as an AI agent misusing this tool could result in significant monetary losses through unintended purchases.

From the tool's definition Place a buy order to purchase on-chain tokens with payment tokens

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

POLICY

How to control executePurchase

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 executePurchase:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "executePurchase": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to executePurchase is blocked until a human approves it. The rest of the server keeps working.

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

Critical-risk tools in Bybit MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about executePurchase

What does the executePurchase tool do? +

Place a buy order to purchase on-chain tokens with payment tokens.\nReturns an. It is categorised as a Financial tool in the Bybit MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on executePurchase? +

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

executePurchase is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit executePurchase? +

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

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

executePurchase 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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