// MCP TOOL REFERENCE

propose_match

Propose a match between an existing maker order and the configured wallet as taker. The maker escrowAppId and address can be found via get_orderbook. quantityMatched is in microunits.

ServerAlpha Arcade
CategoryFinancial

How to control propose_match ↓

WHAT IT DOES

What propose_match does on Alpha Arcade

AI agents use propose_match 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 propose_match needs a policy

This tool initiates on-chain trade matching on a prediction market platform built on Algorand. Matching orders constitutes a financial transaction that commits funds and creates binding positions. If misused by an AI agent, it could result in unintended financial commitments or losses, placing it squarely in the Financial category with critical severity due to irreversible on-chain execution.

From the tool's definition Propose a match between an existing maker order and the configured wallet as taker... quantityMatched is in microunits

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

POLICY

How to control propose_match

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 propose_match:

policy.json

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

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

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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 split_shares Split USDC into equal YES and NO outcome tokens. 1 USDC (1000000 microunits) = 1 YES + 1 N Financial create_limit_order Place a limit order on a prediction market. Price and quantity in microunits (500000 = $0. 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 propose_match

What does the propose_match tool do? +

Propose a match between an existing maker order and the configured wallet as taker. The maker escrowAppId and address can be found via get_orderbook. quantityMatched is in microunits. 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 propose_match? +

Register the Alpha Arcade MCP server in PolicyLayer and add a rule for propose_match: 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 propose_match? +

propose_match 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 propose_match? +

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

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

propose_match 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.

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