Get daily time series data for a cryptocurrency
AI agents call get-crypto-daily to retrieve information from Stocks MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical cryptocurrency price/volume data without any ability to modify data, execute trades, transfer funds, or trigger side effects. It is purely informational query access to Alpha Vantage API market data. Even though it touches financial markets, the tool itself performs no financial transactions or state changes—it only reads and returns data.
From the tool's definition Tool name 'get-crypto-daily' and description 'Get daily time series data for a cryptocurrency' indicate data retrieval with no modification or execution capability.
Attacks that exploit this kind of access
Get daily time series data for a cryptocurrency. It is categorised as a Read tool in the Stocks MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Stocks MCP Server MCP server in PolicyLayer and add a rule for get-crypto-daily: 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 Stocks MCP Server. Nothing to install.
get-crypto-daily 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-crypto-daily 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-crypto-daily. 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-crypto-daily is provided by the Stocks MCP Server MCP server (maharshi2708/stocks_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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