# x402 Demo Discovery Endpoint

> x402 Demo Discovery Endpoint is a paid API for AI agents from x402-demo-discovery-endpoint.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Demo protected endpoint for discovering and testing x402 pay-per-call resource access

## Facts

- Endpoint: POST https://x402-demo-discovery-endpoint.vercel.app/protected
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-demo-discovery-endpoint-vercel-app-8716c847
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V-Fg4mr1uMnyidS2PPJxK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-demo-discovery-endpoint-vercel-app-8716c847 -d '<json body>'
```

Example prompt: I want to test how the x402 micropayment protocol works — can you call the demo discovery endpoint that charges $0.001 USDC per request and show me what protected resource it returns?

## When to prefer this

Use this endpoint when testing or demonstrating the x402 pay-per-call protocol, validating agent micropayment flows, or exploring how USDC-gated HTTP resources behave. Not intended for production data retrieval.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Invalid or malformed x402 payment header — returns 402 or 400
- Network or Vercel hosting downtime — returns 503
- Payment facilitator unavailable — transaction cannot be completed

## How this service works

Demo endpoint for x402 resource discovery

## Output

Returns a demo payload from a payment-gated resource, confirming that the x402 payment was processed and the protected endpoint was successfully accessed.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-demo-discovery-endpoint-vercel-app-8716c847/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-demo-discovery-endpoint.vercel.app](https://www.zero.xyz/host/x402-demo-discovery-endpoint.vercel.app/llms.txt)