# PayStage

> Safety tools for AI agent payments (x402 + MCP). PayStage sits in front of an agent's wallet and returns pay, review, or do_not_pay before money moves.

## Available now

- MCP payment preflight — evaluates a proposed x402 payment against a local policy.
- Outstanding-auth watch — lists and evaluates payments that are authorized but not yet settled.

Install the umbrella MCP server:

    npx -y @paystage/mcp

## Tools

- evaluate_mcp_payment — evaluate a proposed x402 payment against the local policy. Returns pay, review, or do_not_pay.
- list_outstanding_auths — list payments that are authorized but not yet settled.
- evaluate_outstanding_auths — evaluate outstanding authorizations and flag double-pay or limbo risk.

## Policy example

    {
      "version": 1,
      "max_amount": { "value": "1.00", "asset": "USDC", "decimals": 6 },
      "allowed_pay_to": ["0x209693Bc6afc0C5328bA36FaF03C514EF312287C"],
      "allowed_networks": ["eip155:8453", "eip155:84532"],
      "unknown_payee": "review"
    }

## Verdicts

- pay — within policy, safe to proceed.
- review — needs human or higher-level approval.
- do_not_pay — blocked by policy.

## Listed on

- mcp.so: https://mcp.so/server/paystage
- MCP Registry: https://registry.modelcontextprotocol.io/v0/servers?search=xyz.paystage
- npm: https://www.npmjs.com/package/@paystage/mcp
- GitHub: https://github.com/base-buzz/paystage

## Links

- Website: https://paystage.xyz
- GitHub: https://github.com/base-buzz/paystage
- npm: https://www.npmjs.com/package/@paystage/mcp