AI agents call market.arb.get to retrieve information from Rekko MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves arbitrage opportunity data across prediction markets without creating, modifying, deleting, or executing operations. While arbitrage information could inform financial trading decisions, the tool itself only reads and returns market intelligence—the user or AI agent decides whether to act on it.
From the tool's definition The tool name 'market.arb.get' and description 'Get cross-platform arbitrage opportunities' use the verb 'get', which retrieves data. The '(cached)' notation indicates it queries stored information without modifying state.
Attacks that exploit this kind of access
Get cross-platform arbitrage opportunities between Kalshi and Polymarket (cached). It is categorised as a Read tool in the Rekko MCP MCP Server, which means it retrieves data without modifying state.
Register the Rekko MCP server in PolicyLayer and add a rule for market.arb.get: 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 Rekko MCP. Nothing to install.
market.arb.get 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 market.arb.get 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 market.arb.get. 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.
market.arb.get is provided by the Rekko MCP server (rekko-ai/rekko-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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