x402 Scan

MPP Scan is a website for monitoring real transaction volume on the Machine Payments Protocol (MPP).

x402 is an open standard and protocol for internet-native payments over HTTP. It lets resource servers declare payment requirements for endpoints through middleware, while clients and payment facilitators handle payment schemes without requiring the server to manage details such as gas or RPC access. The protocol is designed to support multiple networks, tokens, currencies, signing standards, and payment schemes, including crypto and potentially fiat-based systems. Reference SDKs and integrations are available for TypeScript, Python, and Go, with adapters for frameworks and clients including Express, Fastify, Fetch, Hono, Next.js, and Axios. The project is intended to be openly accessible, backward-compatible where possible, and trust-minimizing: facilitators and resource servers should not move funds beyond the client's stated intentions.

Coinbase Facilitator is a payment service in the x402 flow that verifies payment signatures and submits transactions to the blockchain.

Cloudflare is an internet infrastructure and security platform that provides hosting and delivery infrastructure for applications, agents, websites, and data. Its network combines compute, connectivity, and security at edge locations, with Workers running code close to users and backend data; the company states that its network operates in more than 335 cities and reaches 95% of the world's Internet-connected population within 50 milliseconds. Cloudflare also provides AI crawler controls that let site owners inspect, allow, or block crawler activity, along with pay-per-crawl and a monetization gateway for pages, data sets, APIs, MCP tool calls, files, and search indexes. The described x402 flow uses an HTTP 402 response to request payment, after which an agent pays, retries with proof, and Cloudflare verifies the payment at the edge.

**Stripe** is a financial technology company that provides online payment processing software and APIs for businesses of all sizes. Founded in 2010 by Irish brothers Patrick and John Collison, it lets companies accept payments, manage subscriptions and billing, handle tax compliance, prevent fraud, and access treasury and banking tools. Headquartered in South San Francisco and Dublin, it remains privately held.