{"demo":true,"note":"Free fixed-input sample of real output. The paid route accepts your own input: /api/search ($0.03 per call, x402 USDC on Base, no signup or API key).","paid_endpoint":"https://horizonpulse.dev/api/search","price":"$0.03","fixed_input":"q=x402 payment protocol, n=2 (fixed; recorded sample, refreshed at most daily)","sample_status":200,"sample":{"source":"search","priced":{"amountUsd":"$0.03","amountAtomic":"30000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base","payTo":"0x5b32c973596078a967562ca652761404f19be0e9"},"asOf":"2026-10-01T02:34:15.376Z","ok":true,"query":"x402 payment protocol","provider":"serper (Google results)","n":2,"resultCount":2,"fetchedOk":2,"elapsedMs":1757,"results":[{"rank":1,"url":"https://x402.org/","title":"x402","snippet":"x402 enables instant, low-cost payments for digital services. It's designed for API monetization, agentic commerce, paywalled content, and any scenario where ...","ok":true,"finalUrl":"https://x402.org/","status":200,"format":"markdown","truncated":false,"content":"# x402\n\nClose Search\n\n# x402\n\nx402 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.\n\n Read x402 Foundation Announcement\n#### Last 30 Days\n\n## 75.41M\n\nTransactions\n\n## $24.24M\n\nVolume\n\n## 94.06K\n\nBuyers\n\n## 22K\n\nSellers\n\n### → Accept payments with a single line of code\n\n app.use(paymentMiddleware({\n \"GET /weather\": {\n accepts: [...], // As many networks / schemes as you want to support\n description: \"Weather data\", // What your endpoint does\n },\n}));\n\nThat’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.\n\n#### MEET OUR MEMBERS\n\n#### ABOUT x402\n\n## Payments on the internet are fundamentally flawed.\n\nFilling 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.\n\n#### HTTP-Native\n\n## It’s built-in to the internet.\n\nx402 is built-in to existing HTTP requests, with no additional communication required.\n\n## It’s how the internet should be: open, free, and effortless.\n\n### Zero protocol fees\n\nx402 is free for the customer and the merchant—just pay nominal payment network fees\n\n### Zero wait\n\nMoney moves at the speed of the internet\n\n### Zero friction\n\nNo accounts or personal information needed\n\n### Zero centralization\n\nAnyone on the internet can build on or extend x402\n\n### Zero restrictions\n\nx402 is a neutral standard, not tied to any specific network\n\n#### THE NEW WAY\n\n## We need a new way to transfer value on the internet…\n\nThe 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.\n\n#### The old way\n\n 1. Create account with new API provider\n\n Time consuming setup\n\n 2. Add payment method to API provider\n\n KYC required, delaying access and requiring approval\n\n 3 Buy credits or subscription\n\n Prepaid commitment → overpay or run out of funds\n\n 4 Manage API key\n\n Security risk → must store and rotate keys\n\n 5 Make payment\n\nSlow transactions, chargebacks, fees\n\n#### With x402\n\n 1. AI agent sends HTTP request and receives 402: Payment Required\n\n No account setup, instant onboarding\n\n 2. AI agent pays instantly with stablecoins\n\n No signups or approvals required\n\n 3. API access granted\n\n No API key management and related security risks\n\n## …so it’s time to start building something better\n\nJoin a global community of thousands of builders contributing to an open codebase, faster financial system, and freer internet.\n\n Learn how to get started\n\n## FAQs\n\n### What is x402 used for?\n\nx402 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.\n\n### Is x402 production ready?\n\nYes, x402 is production-ready and has processed millions of transactions. The protocol is open-source and has been audited for security.\n\n### How do I integrate x402?\n\nIntegration is simple – add a single line of middleware to your server. Check our  documentation  for detailed guides and examples in multiple programming languages.\n\n### What blockchains does x402 support?\n\nx402 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.\n\nCopyright © x402 a Series of LF Projects, LLC For web site terms of use, trademark policy and other project policies please see https://lfprojects.org .\n\n Close Menu\n\n About\n\n About x402\n\n Members\n\n Contact\n\n Community\n\n Get Involved\n\n Meeting Calendar\n\n Working Groups\n\n Resources\n\n Blog\n\n Announcements\n\n Docs\n\n Get Started\n\n Reports\n\n Join x402\n\n github\n\n slack"},{"rank":2,"url":"https://docs.stripe.com/payments/machine/x402","title":"x402 payments","snippet":"x402 is a protocol for internet payments. When a client requests a paid resource, your server returns an HTTP 402 response with payment details, including a ...","ok":true,"finalUrl":"https://docs.stripe.com/payments/machine/x402","status":200,"format":"markdown","truncated":true,"content":"# x402 payments | Stripe Documentation\n\nSkip to content\n\n x402\n\n Create account or Sign in\n\n The Stripe Docs logo\n\n Search\n\n / Ask AI\n\n Create account Sign in\n\n Get started Payments Revenue Data Platforms and marketplaces Money management Stablecoins Developer resources\n\n More\n\n APIs & SDKs Help\n\n