Top 20 crypto by volume — prices, 24h change, volume.
AI agents call crypto_overview to retrieve information from Polymarket MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns market data (prices, volume metrics, price changes) without creating positions, executing trades, modifying data, or triggering financial transactions. It is purely informational retrieval. Although the server context involves financial markets and decision-making, this specific tool performs no financial transactions or irreversible actions—it only reads public market information.
From the tool's definition Tool description states it retrieves 'Top 20 crypto by volume — prices, 24h change, volume.' These are read-only data retrievals with no modification, creation, or execution of trades or commands.
Attacks that exploit this kind of access
Top 20 crypto by volume — prices, 24h change, volume. It is categorised as a Read tool in the Polymarket MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for crypto_overview: 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 Polymarket MCP Server. Nothing to install.
crypto_overview 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_overview 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_overview. 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_overview is provided by the Polymarket MCP Server MCP server (miles0sage/polymarket-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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