Top holders across a market's outcome tokens.
AI agents call get_market_holders to retrieve information from Polymarket Research without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves publicly available market data (holder information for outcome tokens) with no side effects. It matches the Read category definition: retrieves or queries data with no side effects. The read-only nature of the server and the descriptive language indicating data retrieval (not creation, modification, or deletion) confirm low severity.
From the tool's definition Tool description states it retrieves 'Top holders across a market's outcome tokens'. The server is explicitly marked as 'Read-only MCP server', and the tool performs a data retrieval operation without modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Top holders across a market's outcome tokens. It is categorised as a Read tool in the Polymarket Research MCP Server, which means it retrieves data without modifying state.
Register the Polymarket Research MCP server in PolicyLayer and add a rule for get_market_holders: 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 Research. Nothing to install.
get_market_holders 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_market_holders 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_market_holders. 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_market_holders is provided by the Polymarket Research MCP server (yoppav/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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