Get latest cryptocurrency listings with market data
AI agents call get-cryptocurrency-listings to retrieve information from CoinMarketCap 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 cryptocurrency market data from an API. It performs no mutations, does not execute code or commands, does not delete data, and does not move money. While CoinMarketCap data can inform financial decisions, the tool itself only reads and returns information with no side effects. Classified as Read with low severity.
From the tool's definition Tool is named 'get-cryptocurrency-listings' and described as 'Get latest cryptocurrency listings with market data' — purely a retrieval operation that queries and returns data without modification or execution.
Attacks that exploit this kind of access
Get latest cryptocurrency listings with market data. It is categorised as a Read tool in the CoinMarketCap MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CoinMarketCap MCP Server MCP server in PolicyLayer and add a rule for get-cryptocurrency-listings: 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 CoinMarketCap MCP Server. Nothing to install.
get-cryptocurrency-listings 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-cryptocurrency-listings 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-cryptocurrency-listings. 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-cryptocurrency-listings is provided by the CoinMarketCap MCP Server MCP server (szcharlesji/crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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