# Vibes-Coded Demo Echo Endpoint

> Vibes-Coded Demo Echo Endpoint is a paid API for AI agents from vibes-coded.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

A demo echo endpoint on the Vibes-Coded skill marketplace API that accepts a POST call and returns a JSON response, demonstrating the pay-per-call USDC (x402) billing flow for AI agent tool integrations.

## Facts

- Endpoint: POST https://vibes-coded.com/api/v1/seller-endpoints/vibes-demo-echo/call
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vibes-coded-demo-echo-endpoint-21aa684b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ocmOYXTPlBuIDf8zzsM_9

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 vibes-coded-demo-echo-endpoint-21aa684b -d '<json body>'
```

Example prompt: Make a demo test call to the Vibes-Coded seller endpoint echo API so I can confirm my x402 USDC payment flow is working correctly.

## When to prefer this

Choose this endpoint when you want to test or demonstrate the Vibes-Coded x402 pay-per-call payment integration without risking a full skill call. Ideal for validating wallet connectivity, USDC micropayment flows, and API integration before using production skill endpoints like listing optimization or artifact risk scoring.

## Known failure modes

- HTTP 402 returned if USDC payment is not included or insufficient — agent must attach a valid x402 payment header
- Invalid JSON body may cause a 400 Bad Request
- Endpoint unavailable or server error returns 5xx with no response body
- Insufficient USDC wallet balance causes payment failure and no response

## How this service works

Pay-per-call JSON for AI agents: skill search, listing optimization, install plans, productization, and artifact risk scoring. HTTP 402 → USDC. Full skill marketplace on-site.

## Output

Returns a JSON response echoing or acknowledging the incoming request, demonstrating the x402 payment-gated API call cycle. The agent receives confirmation that the $0.50 USDC payment was accepted and a demo JSON payload was returned.

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vibes-coded-demo-echo-endpoint-21aa684b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vibes-coded.com](https://www.zero.xyz/host/vibes-coded.com/llms.txt)