Check for arbitrage across Polymarket outcomes. Input comma-separated YES prices.
AI agents call arbitrage_scan 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 is a read operation that queries market data and performs calculations (arbitrage detection) on that data without side effects. While the broader server context involves financial markets, this specific tool only analyzes and returns information about pricing opportunities. No transactions, transfers, or irreversible actions occur.
From the tool's definition Tool description: 'Check for arbitrage across Polymarket outcomes. Input comma-separated YES prices.' The tool scans and analyzes market data to identify arbitrage opportunities but does not execute trades, move funds, or modify market state.
Attacks that exploit this kind of access
Check for arbitrage across Polymarket outcomes. Input comma-separated YES prices. 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 arbitrage_scan: 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.
arbitrage_scan 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 arbitrage_scan 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 arbitrage_scan. 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.
arbitrage_scan 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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