split_shares

THE RISK

Critical Risk

Why split_shares needs a policy

This tool moves real financial assets (USDC stablecoin) on-chain, converting them into prediction market outcome tokens. It commits a financial transaction on the Algorand blockchain, consuming USDC and producing tokenized positions. Misuse could result in unintended conversion of user funds into illiquid or worthless outcome tokens.

From the tool's definition Split USDC into equal YES and NO outcome tokens. 1 USDC (1000000 microunits) = 1 YES + 1 NO

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

POLICY

How to control split_shares

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 split_shares:

policy.json

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

Any call to split_shares 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 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,

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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 split_shares

What does the split_shares tool do? +

Split USDC into equal YES and NO outcome tokens. 1 USDC (1000000 microunits) = 1 YES + 1 NO. 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 split_shares? +

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

split_shares 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 split_shares? +

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

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

split_shares 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.

Start from Alpha Arcade, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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