Place a market order with auto-matching against best available counterparty orders. Price, quantity, and slippage in microunits (500000 = $0.50, 1000000 = 1 share, 50000 = $0.05 slippage). Locks ~0.957 ALGO collateral. Returns escrowAppId, matched quantity, and actual fill price.
AI agents use create_market_order to commit financial operations through Alpha Arcade — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly executes financial transactions on-chain by placing market orders on prediction markets, locking real cryptocurrency (ALGO) as collateral. It commits financial obligations and moves on-chain assets, making it a Financial category tool with critical severity since an AI agent could place unintended trades, lose funds, or create large financial exposures with no reversibility once matched.
From the tool's definition Place a market order with auto-matching against best available counterparty orders. Locks ~0.957 ALGO collateral. Returns escrowAppId, matched quantity, and actual fill price.
Documented attack patterns abuse exactly the kind of access create_market_order gives an agent:
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_market_order:
{
"version": "1",
"default": "deny",
"tools": {
"create_market_order": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}Any call to create_market_order is blocked until a human approves it. The rest of the server keeps working.
Free to start. No card required.
Place a market order with auto-matching against best available counterparty orders. Price, quantity, and slippage in microunits (500000 = $0.50, 1000000 = 1 share, 50000 = $0.05 slippage). Locks ~0.957 ALGO collateral. Returns escrowAppId, matched quantity, and actual fill price. 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.
Register the Alpha Arcade MCP server in PolicyLayer and add a rule for create_market_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.
create_market_order is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the create_market_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.
Set action: deny in the PolicyLayer policy for create_market_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.
create_market_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.
Start from Alpha Arcade, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
20 Alpha Arcade tools catalogued and risk-classified — across an index of 43,000+ MCP servers.