Stablecoin supply leaderboard (via DefiLlama, free/keyless): the largest stablecoins by circulating USD, with peg type (USD/EUR/…), peg mechanism (fiat-backed, crypto-backed, algorithmic), and current price. For tracking stablecoin market share and de-peg risk.
AI agents call crypto.stablecoins 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 passive data retrieval tool that gathers market information about stablecoins for analytics and monitoring purposes. It has no side effects, cannot modify data, execute code, or move funds. The server context involves financial infrastructure (USDC settlement), but this specific tool only reads public blockchain data for informational use.
From the tool's definition Tool retrieves and queries stablecoin supply data from DefiLlama with no modification capability—'leaderboard', 'circulating USD', 'current price' are all read/retrieval operations. No write, delete, or execution of external commands.
Attacks that exploit this kind of access
Stablecoin supply leaderboard (via DefiLlama, free/keyless): the largest stablecoins by circulating USD, with peg type (USD/EUR/…), peg mechanism (fiat-backed, crypto-backed, algorithmic), and current price. For tracking stablecoin market share and de-peg risk. 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.stablecoins: 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.stablecoins 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.stablecoins 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.stablecoins. 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.stablecoins 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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