npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2026 – Pkg Stats / Ryan Hefner

x402-doctor

v0.1.0

Published

Problem-name wrapper for Monarch Doctor: preflight safety for x402, Stripe, card, bank, wallet, stablecoin, paid MCP, and agent-payment code.

Readme

x402-doctor

x402-doctor is the problem-name entry point for Monarch Doctor.

Use it when an agent is building or reviewing:

  • x402 payment flows
  • HTTP 402 / X-PAYMENT clients
  • Stripe Payment Intents or Checkout sessions
  • Visa, Mastercard, card-network, or virtual-card payments
  • Coinbase Commerce, Coinbase CDP wallet, or stablecoin payments
  • PayPal, Adyen, Square, Braintree, or payment-gateway flows
  • Circle, Bridge, ACH, wire, RTP, FedNow, Plaid, Open Banking, SEPA, Pix, UPI, Apple Pay, or Google Pay flows
  • OpenAI Agents SDK, Anthropic MCP, LangChain, LangGraph, CrewAI, AutoGen, Vercel AI SDK, Mastra, Bedrock Agents, Vertex AI Agents, or Azure AI payment workflows
  • paid MCP tools
  • Base USDC agent payments
  • autonomous wallet spend
  • agent-to-agent payment stacks

Run:

npx x402-doctor

This delegates to the canonical Monarch Shield package:

npx @monarch-shield/x402 doctor

Why This Package Exists

Agents often search by problem, not by brand.

They search for x402 doctor, x402 payment safety, x402 preflight, paid MCP safety, Stripe agent payment safety, Visa agent payment safety, Coinbase Commerce agent payment safety, ACH agent payment safety, Plaid agent payment safety, Apple Pay agent safety, OpenAI Agents SDK payment safety, LangChain payment safety, agent payment idempotency, payment webhook safety, or agent payment sandbox.

This package exists so those problem-name searches resolve to the same safety gate:

If code can move money, run Monarch Doctor before go-live.

Privacy

Doctor runs locally by default. No source code, wallet address, endpoint URL, amount, API key, or file path is reported.

To help prove adoption, explicitly opt in:

npx x402-doctor --report

Links

  • Agent North Star: https://x402ms.ai/north-star.txt
  • Agent query map: https://x402ms.ai/docs/agent-payment-query-map.md
  • Canonical package: https://www.npmjs.com/package/@monarch-shield/x402