q402_pay

USE THIS TOOL whenever the user asks to send, transfer, or pay USDC / USDT /

SERVERQ402 Mcp SOURCE@quackai/q402-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/io-github-bitgett-q402-mcp/q402-pay.md

WHAT IT DOES

What q402_pay does on Q402 Mcp

AI agents use q402_pay to commit financial operations through Q402 Mcp, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why q402_pay is rated Critical

This tool directly commits financial obligations by transferring cryptocurrency assets. Even though it is described as 'gasless' and operates on a 'Sandbox-default' environment, the core function is to move money between accounts.

From the tool's definition Tool description explicitly states 'send, transfer, or pay USDC / USDT'; context indicates Q402 is a gasless payment system on EVM chains. The tool facilitates direct movement of stablecoins (USDC/USDT).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs q402_pay safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Q402 Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For q402_pay, this is the rule to start with:

q402_pay Approval-gated

Any call to q402_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": {
    "q402_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 Q402 Mcp, apply this rule, and every q402_pay call is checked against it from then on.

FAQ

Questions about q402_pay

What does the q402_pay tool do? +

USE THIS TOOL whenever the user asks to send, transfer, or pay USDC / USDT /. It is categorised as a Financial tool in the Q402 Mcp MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on q402_pay? +

Register the Q402 MCP server in PolicyLayer and add a rule for q402_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 Q402 Mcp. Nothing to install.

What risk level is q402_pay? +

q402_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 q402_pay? +

Yes. Add a rate_limit block to the q402_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 q402_pay completely? +

Set action: deny in the PolicyLayer policy for q402_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 q402_pay? +

q402_pay is provided by the Q402 MCP server (@quackai/q402-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Q402, and thousands of servers like it.

This server

All 41 Q402 tools → Critical-risk tools on this server →

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pay_x402 on 8004swap →pay_invoice on Bitcoin MCP Server → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →