# QuantaFlow SERP Walmart Search

> QuantaFlow SERP Walmart 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 2026-10-14).

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

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/serp-walmart?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-serp-walmart-search-ed6556ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RRYj7lPxwJYNN8TRXCwsC

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-search-ed6556ec -d '<json body>'
```

Example prompt: Search Walmart for 'wireless noise-cancelling headphones' and give me the top product listings with their prices and links.

## When to prefer this

Choose this endpoint when you need programmatic access to Walmart product search results on a per-query, pay-as-you-go basis via x402 micropayments (USDC). It is best suited for agents that need real-time Walmart SERP data without a subscription, especially in web3/DeFi-native workflows where crypto micropayments are preferred over API keys.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not accepted, resulting in a 402 Payment Required response
- Invalid query parameters: malformed path or query object leads to upstream error
- Upstream unavailability: Walmart search data provider is down or rate-limiting, returning 5xx errors
- Empty results: valid query returns no product listings for obscure or misspelled search terms
- Timeout: upstream response takes too long, resulting in a gateway timeout error

## 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 body containing structured product search results, including product names, prices, ratings, and URLs as returned by the underlying search data provider. The content type is passed through from the upstream source.

## 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-search-ed6556ec/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)