x402_register
AI agents use x402_register to commit financial operations through X402 Discovery — usually the final step of a payment, billing, or trading workflow. A call moves real money.
The server context is explicitly financial — USDC micropayments on Base blockchain. The sibling tool 'register_tool_for_payment' and the x402 payment protocol context strongly imply that 'x402_register' registers a tool or endpoint for payment-gated access, potentially committing financial obligations or enabling payment flows.
From the tool's definition Tool name 'x402_register' on a server described as enabling 'autonomous agents to find, evaluate, and pay for services via USDC micropayments on Base'; sibling tool 'register_tool_for_payment' strongly suggests registration involves financial commitment or…
Attacks that exploit this kind of access
x402_register. It is categorised as a Financial tool in the X402 Discovery MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the X402 Discovery MCP server in PolicyLayer and add a rule for x402_register: 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 X402 Discovery. Nothing to install.
x402_register 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 x402_register 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 x402_register. 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.
x402_register is provided by the X402 Discovery MCP server (rplryan/ouroboros). 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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