{"uid":"cap_aOH3VmldxiZY242FO0mdk","slug":"hello-world-x402-vercel-app-d23d4494","name":"Hello World x402 Demo Endpoint","description":"Returns \"Hello World\" after payment verification","url":"https://hello-world-x402.vercel.app/hello","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"string","description":"A simple greeting message"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_b2sv2SkQd_U9i9iRyte_7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a simple 'Hello World' string after verifying a $0.001 USDC micropayment via the x402 payment protocol","exampleAgentPrompt":"Can you call the hello-world x402 demo endpoint to test that micropayments are working — it should return 'Hello World' after the $0.001 USDC payment goes through?","exampleUseCases":null,"resultDescription":"A simple greeting string 'Hello World' returned after successful x402 payment verification, confirming the micropayment flow completed successfully.","failureModes":["Payment not included or malformed x402 header — returns HTTP 402 Payment Required","Insufficient USDC balance — payment verification fails","Network mismatch (wrong chain, not eip155:8453/Base) — payment rejected","Invalid or expired payment — returns authorization error","Rate limiting or Vercel deployment unavailability — returns 5xx error"],"whenToPreferThis":"Use this endpoint when you want to test or demonstrate the x402 micropayment protocol in action, verify that a USDC-gated HTTP call works end-to-end, or confirm your x402 client implementation is functioning correctly. It is a canonical 'hello world' demo of pay-per-call APIs and is ideal for integration smoke tests.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:32:53.368Z","isFirstParty":false}