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hello-world-x402 /world - Reverse Greeting Endpoint
x402
hello-world-x402 /world - Reverse Greeting 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 2026-10-22).
Returns the string 'World Hello' (a reversed greeting) as a plain-text response after micropayment verification via x402
Price / call$0.001
Success—
StatusUnknown
How this service works
Returns "World Hello" - UPDATED TEST v2.0
Output
A plain-text string 'World Hello' returned with content-type text/plain; charset=utf-8. This is a simple reversed greeting used to demonstrate and test x402 pay-per-call functionality.
Example use cases
Example prompt
“Fetch the reversed greeting from the hello-world-x402 /world endpoint — it should return 'World Hello' as plain text after the $0.001 USDC micropayment goes through.”
Technical details
Endpoint
GEThttps://hello-world-x402.vercel.app/world?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to test or demonstrate the x402 micropayment protocol with a minimal, predictable plain-text response. It is ideal for verifying that a $0.001 USDC pay-per-call flow works end-to-end, or for integration testing of x402-enabled agent payment pipelines. Not suitable for production use cases requiring meaningful data.
Side effects
- Payment not provided or incorrect amount: 402 Payment Required response with payment details
- Network or Vercel deployment unavailable: 503 or timeout
- Invalid HTTP method (non-GET): 405 Method Not Allowed
- Payment verification failure on eip155:845 network: payment rejected or unconfirmed
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"_nonJson": true,
"_preview": "World Hello",
"_contentType": "text/plain; charset=utf-8"
}Tags
x402
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