Latest daily stock quote for a US-listed ticker (e.g. AAPL, MSFT, BRK.B): open/high/low/close, volume, VWAP, trade count, change and percent change vs the prior session, plus company name, exchange, security type, and market cap. NOTE: end-of-day / delayed data (response flags delayed=true) — for...
AI agents call stocks.quote to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure data retrieval tool that queries and returns market data without side effects. While the server settles payments in USDC via x402, the tool itself does not move money or commit financial obligations—it only reads stock information. The delayed nature and read-only purpose place it firmly in the Read category with low severity.
From the tool's definition Tool retrieves 'Latest daily stock quote' with historical data (open/high/low/close, volume, VWAP, trade count, change) and company metadata (name, exchange, security type, market cap).
Attacks that exploit this kind of access
Latest daily stock quote for a US-listed ticker (e.g. AAPL, MSFT, BRK.B): open/high/low/close, volume, VWAP, trade count, change and percent change vs the prior session, plus company name, exchange, security type, and market cap. NOTE: end-of-day / delayed data (response flags delayed=true) — for daily snapshots and post-close analysis, not real-time trading. Market data by Massive (formerly Polygon.io). It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for stocks.quote: 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 Mcp. Nothing to install.
stocks.quote 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 stocks.quote 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 stocks.quote. 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.
stocks.quote is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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