Claim winnings or refund from a settled UPDOWN round. Pre-checks via quoteClaimPayout — refuses to send if 0.
AI agents use updown_claim to commit financial operations through Basis MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool triggers an on-chain financial transaction to claim monetary payouts from a prediction market. It moves cryptocurrency assets and constitutes a financial operation. Misuse could result in unauthorized claims or interaction with incorrect rounds, making severity high.
From the tool's definition 'Claim winnings or refund from a settled UPDOWN round' — directly moves funds (winnings or refunds) to the user from a prediction market contract.
Attacks that exploit this kind of access
Claim winnings or refund from a settled UPDOWN round. Pre-checks via quoteClaimPayout — refuses to send if 0. It is categorised as a Financial tool in the Basis MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Basis MCP Server MCP server in PolicyLayer and add a rule for updown_claim: 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 Basis MCP Server. Nothing to install.
updown_claim is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the updown_claim 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 updown_claim. 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.
updown_claim is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). 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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