# QuantaFlow SERP Walmart Product Search

> QuantaFlow SERP Walmart Product Search is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).

Performs a Walmart product search engine results page (SERP) query and returns product listings, via the x402 micropayment-gated API gateway.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/serp-walmart-product?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-serp-walmart-product-search-8f44283c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZYmcN-vLxiHC77ZTloPgp

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-serp-walmart-product-search-8f44283c -d '<json body>'
```

Example prompt: Search Walmart for 'wireless noise-cancelling headphones under $100' and give me the top product listings with prices and titles.

## When to prefer this

Choose this endpoint when you need programmatic access to Walmart product search results (SERP data) on a pay-per-call basis using the x402 micropayment protocol, especially useful for agents that need Walmart-specific product pricing, availability, or catalog data without a subscription-based API contract.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment rejected — no results returned
- Invalid query path or malformed request body — upstream may return an error or empty results
- Upstream Walmart SERP provider unavailability — gateway may return a 502 or timeout
- Rate limiting by the upstream provider — may return throttling errors
- Empty result set if the query matches no Walmart products

## How this service works

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

## Output

Returns the upstream Walmart SERP response, including product listings with titles, prices, ratings, and URLs as returned by the underlying data source, passed through after successful x402 micropayment authorization.

## 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-serp-walmart-product-search-8f44283c/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)