x402

In plain words

X402 is an open standard that enables HTTP APIs to charge per request using blockchain payments. Developed by Coinbase, it eliminates the need for API keys or stored credit cards. Users and AI agents keep funds in their own wallets, discover compatible endpoints dynamically, and automatically pay microtransactions in USDC or other tokens per API call. It targets developers and AI systems that need seamless, frictionless access to multiple APIs without account creation or pre-funding requirements.

written from the facts on this page · September 2026

From the sources

x402 revives the original “HTTP 402 Payment Required” status code to allow bots, agents, and apps to pay-per-call using stablecoins—no API keys, no human-in-the-loop setup required. Make any API or MCP server accessible to agents without human config.

x402 is the internet's payment standard. An open standard for internet-native payments that empowers agentic payments at scale. Build a more free and fair internet.

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. 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. Filling out a form is a human…from x402.org

In the maker’s words, at launch

Hi HN – excited to announce x402, initially developed by Coinbase (YC 12) x402 lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers (humans or AI agents) keep funds in their own wallet and dynamically discover compatible endpoints, call them as usual, and automatically pay a…

• 
  P402.ioJan 2026 · p402.io · ▲102

  Route, verify, and settle paid API calls with clear traces

• 
  delegareApr 2026 · delegare.dev · ▲70

  Hi guys, am building SecureLend.ai and when working on our underwriting agents (free trial, paid after) I had issues with seamless payment options. Of course I looked at x402 which I believe is a great protocol but not a fan of a) sharing private keys with the agent b) having a human in the loop or c) similar workaround e.g. pre-funded wallets So I started building out a solution. For my use case it was important to not only have stablecoins but also a fiat rail which is now implemented using Stripe. Initially I build a mandate system internally but am very glad and big shoutout to the guys…

• 
  x402 wallet API: 9 Base endpoints, USDCAug 2026 · api.kachangsia.com · ▲1

  9 Base endpoints for AI agents, paid in USDC per call

• 
  L402.org2024 · l402.org · ▲122

  Internet-native paywalls with HTTP 402 status code

• 
  Cloud World ModelJun 2026 · cloudworldmodel.ai · ▲172

  How we built native x402 payable API support so AI agents can run simulations and pay per request — no human-in-the-loop billing setup required.

• 
  x402statsAug 2026 · x402stats.io · ▲3

  Independent x402 stats: organic volume, wash-trades removed

• 
  Spira Maxima▲578

  Video model that turns script into viral social media videos

  AI · 20d ago · spira.ai

• 
  Rill Browser▲540

  The browser where Claude Code and Codex work beside you

  AI · 20d ago · rill.love

• 
  Germany's new sovereign AI model Kolibri▲424

  Kolibri is Aleph Alpha

  AI · 22d ago · tej.as

• 
  Giving Opus 5.5 a simulated paint canvas▲392

  Paintings by AI models: programs run through a simulation of oil paint.

  AI · 23d ago · stillwet.art

• 
  Beam.win▲377

  Run AI agents on one Mac and use its windows on another

  AI · 6d ago · beam.win

• 
  FastRouter.ai▲364

  Route requests to the right LLM for cost, latency & quality

  AI · 24d ago · fastrouter.ai

• 
  Tapflow 2.0▲1,125

  We built Tapflow for devs, designers, PMs, and tech folks who’ve been sitting on internal docs, templates, and systems — but never productized them. Upload a PDF, notes, or workshop deck, and Tapflow drafts a structured product (with chapters, teaser and pricing plans). It’s good for AI kits, onboarding guides, design systems, and frameworks. You can sell through Stripe, LemonSqueezy, or PayPal. Real-time collaboration is in early beta. No site builder, no LMS — clean design and just focused tools to ship. Fully bootstrapped and just launched on PH today →…

  Work · 2025 · tapflow.ai

• C9
  Clippy – 90s UI for local LLMs▲1,122

  Life & fun · 2025 · felixrieseberg.github.io

• 
  Appwrite Sites▲990

  Appwrite 2.0 brings a new engine, a rebuilt Console, five database types, an S3 API, an OAuth 2.1 server, and organization-level Domains and Firewall.

  Dev tools · 2025 · appwrite.io

• 
  AI Meeting Notes by Notion▲965

  Perfect meeting memory in Notion

  AI · 2025 · notion.com

• 
  Den▲948

  Multiplayer AI agent builder

  AI · 2025 · getden.io

• 
  Raycast for iOS▲870

  Powerful productivity on the go

  AI · 2025 · raycast.com