// MCP TOOL REFERENCE

create_limit_order

ServerAlpha Arcade
CategoryFinancial

WHAT IT DOES

What create_limit_order does on Alpha Arcade

AI agents use create_limit_order to commit financial operations through Alpha Arcade — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why create_limit_order needs a policy

This tool directly commits financial obligations on-chain by placing a limit order on a prediction market and locking real ALGO collateral. It involves on-chain financial transactions on Algorand, making it Financial category with critical severity due to the potential for irreversible monetary commitment and the risk of an AI agent placing unintended or manipulative market orders.

From the tool's definition Place a limit order on a prediction market. Price and quantity in microunits (500000 = $0.50, 1000000 = 1 share). Locks ~0.957 ALGO collateral

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

POLICY

How to control create_limit_order

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

policy.json

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

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

Create a free account and register Alpha Arcade — 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 Alpha Arcade tools

Financial amend_order Edit an existing unfilled order in-place (change price, quantity, or slippage). Faster and Financial claim Claim USDC from a resolved market by redeeming outcome tokens. Winning = 1:1 USDC. Losing Financial propose_match Propose a match between an existing maker order and the configured wallet as taker. The ma Financial split_shares Split USDC into equal YES and NO outcome tokens. 1 USDC (1000000 microunits) = 1 YES + 1 N Financial create_market_order Place a market order with auto-matching against best available counterparty orders. Price, Financial merge_shares Merge equal YES and NO outcome tokens back into USDC. 1 YES + 1 NO = 1 USDC. Destructive cancel_order Cancel an open order. Requires escrowAppId (from create_limit_order or get_open_orders) an Read get_agent_guide Returns the Alpha Arcade agent guide — data model, units, orderbook mechanics, workflows,

All 20 Alpha Arcade tools →

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Go deeper

Critical-risk tools in Alpha Arcade → 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 create_limit_order

What does the create_limit_order tool do? +

Place a limit order on a prediction market. Price and quantity in microunits (500000 = $0.50, 1000000 = 1 share). Locks ~0.957 ALGO collateral (refunded on cancel/fill). Returns escrowAppId — save it for cancel_order. It is categorised as a Financial tool in the Alpha Arcade MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on create_limit_order? +

Register the Alpha Arcade MCP server in PolicyLayer and add a rule for create_limit_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 Alpha Arcade. Nothing to install.

What risk level is create_limit_order? +

create_limit_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 create_limit_order? +

Yes. Add a rate_limit block to the create_limit_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 create_limit_order completely? +

Set action: deny in the PolicyLayer policy for create_limit_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 create_limit_order? +

create_limit_order is provided by the Alpha Arcade MCP server (phara23/alpha-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Alpha Arcade tool call.

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20 Alpha Arcade tools catalogued and risk-classified — across an index of 43,000+ MCP servers.