# x402: An open protocol for internet-native payments backed by Coinbase

Source: https://www.x402.org

## Summary

x402 is presented as an open, neutral standard for internet-native payments that lets clients and servers pay each other directly over HTTP. The page says servers can require payment with a single line of middleware, and that an unpaid request receives an HTTP 402 response prompting the client to pay and retry. It states that x402 has zero protocol fees, requires no accounts or personal information, and is not tied to any specific network. According to the FAQ, the protocol is production-ready, has processed millions of transactions, and has been audited for security.

## Article

x402 is an open, neutral standard for internet-native payments. It absolves the Internet’s original sin by natively making payments possible between clients and servers, creating win-win economies that empower agentic payments at scale. x402 exists to build a more free and fair internet.

Read x402 Foundation Announcement

Last 30 Days

→ Accept payments with a single line of code

app.use(paymentMiddleware({ "GET /weather": { accepts: [...], // As many networks / schemes as you want to support description: "Weather data", // What your endpoint does }, }));

That’s it. Add one line of code to require payment for each incoming request. If a request arrives without payment, the server responds with HTTP 402, prompting the client to pay and retry.

MEET OUR MEMBERS

ABOUT x402

Payments on the internet are fundamentally flawed.

Filling out a form is a human behavior that doesn’t match the programmatic nature of the internet. It’s time for an open, internet-native form of payments. Payments that are amazing for humans and AI agents.

HTTP-Native

It’s built-in to the internet.

x402 is built-in to existing HTTP requests, with no additional communication required.

It’s how the internet should be: open, free, and effortless.

Zero protocol fees

x402 is free for the customer and the merchant—just pay nominal payment network fees

Zero wait

Money moves at the speed of the internet

Zero friction

No accounts or personal information needed

Zero centralization

Anyone on the internet can build on or extend x402

Zero restrictions

x402 is a neutral standard, not tied to any specific network

THE NEW WAY

We need a new way to transfer value on the internet…

The old way of doing payments is barely working for a human world, let alone an agentic future. x402 does in moments what existing systems can’t do at all.

The old way

1. Create account with new API provider Time consuming setup

2. Add payment method to API provider KYC required, delaying access and requiring approval

3 Buy credits or subscription Prepaid commitment → overpay or run out of funds

4 Manage API key Security risk → must store and rotate keys

5 Make payment Slow transactions, chargebacks, fees

With x402

1. AI agent sends HTTP request and receives 402: Payment Required No account setup, instant onboarding

2. AI agent pays instantly with stablecoins No signups or approvals required

3. API access granted No API key management and related security risks

…so it’s time to start building something better

Join a global community of thousands of builders contributing to an open codebase, faster financial system, and freer internet.

Learn how to get started

FAQs

What is x402 used for?

x402 enables instant, low-cost payments for digital services. It’s designed for API monetization, agentic commerce, paywalled content, and any scenario where traditional payment methods are too slow or expensive.

Is x402 production ready?

Yes, x402 is production-ready and has processed millions of transactions. The protocol is open-source and has been audited for security.

How do I integrate x402?

Integration is simple – add a single line of middleware to your server. Check our documentation for detailed guides and examples in multiple programming languages.

What blockchains does x402 support?

x402 is blockchain-agnostic and supports all EVM-compatible chains, Solana, and more. Stablecoin payments are the primary use case. x402 is also extensible to traditional payment methods.

## Comments

**macbudkowski.eth**: Wondering if it doesn't open a path to monetize sites like Kiwi. I imagine they'd add reflinks, so if it takes e.g., $0.10 to read a Substack post, we could take $0.02 or sth. Of course this model works only at scale, but might make sense long-term.