Edit an existing unfilled order in-place (change price, quantity, or slippage). Faster and cheaper than cancel + recreate. Only works on orders with zero quantity filled. Collateral is adjusted automatically — extra funds are sent if value increases, refunded if it decreases.
AI agents use amend_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 modifies active financial orders on a prediction market, adjusting price, quantity, and collateral. It directly interacts with on-chain financial positions and moves funds, placing it firmly in the Financial category with critical severity given the potential for misuse in live trading markets on Algorand.
From the tool's definition Edit an existing unfilled order in-place (change price, quantity, or slippage)... Collateral is adjusted automatically — extra funds are sent if value increases, refunded if it decreases.
Documented attack patterns abuse exactly the kind of access amend_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 amend_order:
{
"version": "1",
"default": "deny",
"tools": {
"amend_order": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}Any call to amend_order is blocked until a human approves it. The rest of the server keeps working.
Free to start. No card required.
Edit an existing unfilled order in-place (change price, quantity, or slippage). Faster and cheaper than cancel + recreate. Only works on orders with zero quantity filled. Collateral is adjusted automatically — extra funds are sent if value increases, refunded if it decreases. 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 amend_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.
amend_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 amend_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 amend_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.
amend_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.