List prediction markets from Polymarket. Returns market information including questions, outcomes, prices, volume, and liquidity.
AI agents call list_markets 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 retrieves and queries publicly available market data from Polymarket without any side effects. It does not create, modify, delete, or execute operations. The data returned is informational only. This is a straightforward Read category tool with low severity since market data queries pose minimal risk even if an AI agent misuses them.
From the tool's definition Tool description explicitly states it 'List prediction markets' and 'Returns market information' (questions, outcomes, prices, volume, liquidity). The verb 'list' and 'returns' indicate data retrieval with no modification, creation, or deletion of data.
Attacks that exploit this kind of access
List prediction markets from Polymarket. Returns market information including questions, outcomes, prices, volume, and liquidity. 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 list_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 Polymarket MCP Server. Nothing to install.
list_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 list_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 list_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.
list_markets is provided by the Polymarket MCP Server MCP server (rafael-pina/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.
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