Get a real-time orderbook snapshot for a market via WebSocket. Faster than on-chain reads (~5s vs ~10s). Returns the same full processed snapshot shape as get_full_orderbook, with bids, asks, spread, and per-side YES/NO detail. Requires the market slug (URL-friendly name), not the market app ID.
AI agents call stream_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.
stream_orderbook is a read-only query tool that fetches and returns orderbook market data without side effects. It does not create, modify, delete, execute commands, or move funds. The tool merely provides faster real-time access to existing market information. Misuse by an AI agent would be limited to information gathering and would not cause financial loss, data destruction, or irreversible actions.
From the tool's definition Tool retrieves real-time orderbook data via WebSocket. Description states it 'Get[s] a real-time orderbook snapshot' and 'Returns the same full processed snapshot shape as get_full_orderbook', with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access stream_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 stream_orderbook:
{
"version": "1",
"default": "deny",
"tools": {
"stream_orderbook": {}
}
}stream_orderbook is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a real-time orderbook snapshot for a market via WebSocket. Faster than on-chain reads (~5s vs ~10s). Returns the same full processed snapshot shape as get_full_orderbook, with bids, asks, spread, and per-side YES/NO detail. Requires the market slug (URL-friendly name), not the market app ID. 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 stream_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.
stream_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 stream_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 stream_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.
stream_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.