Get top cryptocurrencies ranked by market cap with prices, volumes, and 24h changes.
AI agents call market_cap to retrieve information from Mcp Market Data without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries public market data (cryptocurrency rankings, prices, volumes, changes) with no side effects, no state modification, no code execution, and no financial transactions. It is purely informational.
From the tool's definition Tool name 'market_cap' and description 'Get top cryptocurrencies ranked by market cap with prices, volumes, and 24h changes' indicates data retrieval only. The verb 'Get' and absence of modification/execution/deletion language confirm read-only operation.
Attacks that exploit this kind of access
Get top cryptocurrencies ranked by market cap with prices, volumes, and 24h changes. It is categorised as a Read tool in the Mcp Market Data MCP Server, which means it retrieves data without modifying state.
Register the Mcp Market Data MCP server in PolicyLayer and add a rule for market_cap: 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 Market Data. Nothing to install.
market_cap 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 market_cap 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 market_cap. 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.
market_cap is provided by the Mcp Market Data MCP server (shipitandpray/mcp-market-data). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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