Best price/qty on the order book for a symbol or symbols.
AI agents call ticker_bookTicker to retrieve information from Aster Finance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries current order book information (best bid/ask prices and quantities) for cryptocurrency symbols. It is a pure data retrieval operation that cannot modify, create, or delete data, nor can it execute trades or move funds. While the server provides trading capabilities (evident from sibling tools like cancelOrder, cancelAllOpenOrders), this specific tool is read-only market data access.
From the tool's definition The tool retrieves 'Best price/qty on the order book' which is a read-only query of market data with no side effects or ability to modify state.
Attacks that exploit this kind of access
Best price/qty on the order book for a symbol or symbols. It is categorised as a Read tool in the Aster Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Aster Finance MCP Server MCP server in PolicyLayer and add a rule for ticker_bookTicker: 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 Aster Finance MCP Server. Nothing to install.
ticker_bookTicker 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 ticker_bookTicker 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 ticker_bookTicker. 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.
ticker_bookTicker is provided by the Aster Finance MCP Server MCP server (questflowai/aster-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
ticker_bookTicker is one line of Aster Finance MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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