x402_pay

Make an HTTP request to a URL, automatically paying any x402 Payment Required (402) response.

SERVERRemit Md MCP Server SOURCEpay-skill/mcp

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/pay-skill-mcp/x402-pay.md

WHAT IT DOES

What x402_pay does on Remit Md MCP Server

AI agents use x402_pay to commit financial operations through Remit Md MCP Server, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why x402_pay is rated Critical

This tool directly moves money in response to HTTP 402 status codes. An AI agent using this could be tricked into making unintended payments by requesting URLs designed to return 402 responses. The automatic payment mechanism with potentially unbounded transaction amounts makes this critical severity. Financial transactions are the most severe risk category regardless of other capabilities present.

From the tool's definition Tool description explicitly states 'automatically paying any x402 Payment Required (402) response' - this commits financial transactions. Server description confirms 'financial transactions such as direct payments' and 'fund streaming' are core functionality.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs x402_pay safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Remit Md MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For x402_pay, this is the rule to start with:

x402_pay Approval-gated

Any call to x402_pay is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "x402_pay": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Remit Md MCP Server, apply this rule, and every x402_pay call is checked against it from then on.

FAQ

Questions about x402_pay

What does the x402_pay tool do? +

Make an HTTP request to a URL, automatically paying any x402 Payment Required (402) response. It is categorised as a Financial tool in the Remit Md MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on x402_pay? +

Register the Remit Md MCP Server MCP server in PolicyLayer and add a rule for x402_pay: 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 Remit Md MCP Server. Nothing to install.

What risk level is x402_pay? +

x402_pay is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit x402_pay? +

Yes. Add a rate_limit block to the x402_pay 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.

How do I block x402_pay completely? +

Set action: deny in the PolicyLayer policy for x402_pay. 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.

What MCP server provides x402_pay? +

x402_pay is provided by the Remit Md MCP Server MCP server (pay-skill/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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