Fetch the on-chain orderbook as a unified YES-perspective view. Merges all 4 sides (YES bids/asks + NO bids/asks) into a single book: NO bids become YES asks at $(1-X), NO asks become YES bids at $(1-X). Asks sorted low-to-high, bids sorted high-to-low. Includes spread calculation.
AI agents call get_orderbook to retrieve information from Alpha Arcade without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
get_orderbook retrieves and reformats existing orderbook data without creating, modifying, deleting, or executing any state-changing operations. Even though it operates in a financial prediction market context, the tool itself only reads and displays data. The most severe risk from misuse would be information exposure, not financial loss or unintended transactions. This maps cleanly to the Read category.
From the tool's definition Tool description explicitly states it 'Fetch[es] the on-chain orderbook' and presents data transformation/aggregation of existing market data. No mutations, state changes, or side effects are described.
Documented attack patterns abuse exactly the kind of access get_orderbook 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 get_orderbook:
{
"version": "1",
"default": "deny",
"tools": {
"get_orderbook": {}
}
}get_orderbook is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch the on-chain orderbook as a unified YES-perspective view. Merges all 4 sides (YES bids/asks + NO bids/asks) into a single book: NO bids become YES asks at $(1-X), NO asks become YES bids at $(1-X). Asks sorted low-to-high, bids sorted high-to-low. Includes spread calculation. It is categorised as a Read tool in the Alpha Arcade MCP Server, which means it retrieves data without modifying state.
Register the Alpha Arcade MCP server in PolicyLayer and add a rule for get_orderbook: 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.
get_orderbook is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_orderbook 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 get_orderbook. 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.
get_orderbook 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.
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20 Alpha Arcade tools catalogued and risk-classified — across an index of 43,000+ MCP servers.