# QuantaFlow eBay SERP Search via x402

> QuantaFlow eBay SERP Search via x402 is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Performs an eBay search engine results page (SERP) query and returns product listings via a pay-per-call x402 payment gateway at $0.01 USDC per request.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/serp-ebay?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-ebay-serp-search-via-x402-996d77f8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cM4tyOc_ErWz0ga_wWfb2

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 quantaflow-ebay-serp-search-via-x402-996d77f8 -d '<json body>'
```

Example prompt: Search eBay for a used iPhone 14 Pro and show me the current listings with prices — I want to see what's available right now.

## When to prefer this

Choose this endpoint when you need live eBay marketplace search results and want to pay per call with USDC via the x402 protocol rather than managing a traditional API key subscription. Ideal for agents that perform occasional or bursty eBay lookups without committing to a monthly API plan.

## Known failure modes

- Payment failure if insufficient USDC balance — returns 402 Payment Required
- Invalid or malformed query parameters result in empty or error response
- eBay upstream API rate limiting or downtime causes 502/503 passthrough errors
- Missing required path or query fields return a generic proxy error
- Network timeout from upstream eBay service

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

Returns the upstream eBay SERP response containing product listings, titles, prices, item conditions, seller details, and listing URLs matching the submitted search query. The response is passed through directly from the upstream eBay search API after successful micropayment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-ebay-serp-search-via-x402-996d77f8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)