Get market data for a specific cryptocurrency, showing all exchange markets where it trades
AI agents call get_markets to retrieve information from CoinCap 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 and displays cryptocurrency market data for exchanges. It performs a read-only query operation with no side effects, no code execution, no data modification, and no financial transactions. The blast radius of misuse is minimal—an AI agent could only retrieve market information that is already public. This is a standard Read category tool.
From the tool's definition Tool name 'get_markets' and description 'Get market data for a specific cryptocurrency, showing all exchange markets where it trades' indicate retrieval of publicly available market information with no modification, creation, deletion, or execution…
Attacks that exploit this kind of access
Get market data for a specific cryptocurrency, showing all exchange markets where it trades. It is categorised as a Read tool in the CoinCap MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CoinCap MCP Server MCP server in PolicyLayer and add a rule for get_markets: 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 CoinCap MCP Server. Nothing to install.
get_markets 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_markets 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_markets. 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_markets is provided by the CoinCap MCP Server MCP server (sanchello69/mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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