Full coin profile by CoinGecko id (e.g. bitcoin, ethereum, solana). Returns price, market cap + rank, FDV, 24h volume, all-time high/low with dates, circulating/total/max supply, price changes (1h/24h/7d/30d/1y), categories, and official links (homepage, X, GitHub, subreddit). Richer than crypto....
AI agents call crypto.coin 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 public cryptocurrency market information. It performs no mutations, executions, or financial operations. While it's part of a crypto infrastructure, the tool itself only reads and returns market data without side effects. The pay-per-call settlement model affects the server infrastructure, not this tool's classification.
From the tool's definition Tool retrieves cryptocurrency data from CoinGecko API: 'Returns price, market cap + rank, FDV, 24h volume, all-time high/low with dates, circulating/total/max supply, price changes, categories, and official links.' No modification, deletion, or financial…
Attacks that exploit this kind of access
Full coin profile by CoinGecko id (e.g. bitcoin, ethereum, solana). Returns price, market cap + rank, FDV, 24h volume, all-time high/low with dates, circulating/total/max supply, price changes (1h/24h/7d/30d/1y), categories, and official links (homepage, X, GitHub, subreddit). Richer than crypto.token-price (spot only) and crypto.markets (list row). 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 crypto.coin: 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.
crypto.coin 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 crypto.coin 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 crypto.coin. 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.
crypto.coin 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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