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Hello World x402 Demo Endpoint
x402
Hello World x402 Demo Endpoint is a paid API for AI agents from hello-world-x402.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns a simple 'Hello World' string after verifying a $0.001 USDC micropayment via the x402 payment protocol
Price / call$0.001
Success—
StatusUnknown
How this service works
Returns "Hello World" after payment verification
Output
A simple greeting string 'Hello World' returned after successful x402 payment verification, confirming the micropayment flow completed successfully.
Example use cases
Example prompt
“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?”
Technical details
Endpoint
GEThttps://hello-world-x402.vercel.app/helloWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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