cancel_order

THE RISK

Critical Risk

Why cancel_order needs a policy

Cancelling an open order on a cryptocurrency exchange is a financial operation — it terminates a live financial commitment/instruction. While it doesn't move money directly, it modifies the state of a financial order that could affect trades, exposure, and market positions.

From the tool's definition Cancels an existing open order on an exchange

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

POLICY

How to control cancel_order

PolicyLayer is an MCP gateway — it sits between your AI agents and CCXT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel_order:

policy.json

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

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

Create a free account and register CCXT 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

Related tools and policies

More CCXT MCP Server tools

Financial withdraw_cryptocurrency Initiates a cryptocurrency withdrawal to a specified address. Financial create_futures_limit_order Places a new limit order in a futures/swap market. Financial create_futures_market_order Places a new market order in a futures/swap market, filled at the best available current p Financial create_spot_limit_order Places a new limit order in the spot market. Financial create_spot_market_order Places a new market order in the spot market, to be filled at the best available current p Financial set_trading_leverage Sets the leverage for a specific trading symbol, typically in futures or margin markets. Read calculate_technical_indicator Fetches OHLCV data for a given symbol and timeframe, then calculates a specified technical Read fetch_account_balance Fetches the current balance of an account from a specified cryptocurrency exchange.

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Go deeper

Critical-risk tools in CCXT 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 cancel_order

What does the cancel_order tool do? +

Cancels an existing open order on an exchange. It is categorised as a Financial tool in the CCXT MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on cancel_order? +

Register the CCXT MCP Server MCP server in PolicyLayer and add a rule for cancel_order: 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 CCXT MCP Server. Nothing to install.

What risk level is cancel_order? +

cancel_order 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 cancel_order? +

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

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

cancel_order is provided by the CCXT MCP Server MCP server (jcwleo/ccxt-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CCXT MCP Server tool call.

Start from CCXT 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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