# BuiltWith Product Search via Locus x402

> BuiltWith Product Search via Locus x402 is a paid API for AI agents from builtwith.x402.paywithlocus.com, paid per call via x402, $0.055/call, status unknown (last checked 2026-09-14).

Search for products across BuiltWith's database of 100M+ websites, returning technology and product usage data with pagination support.

## Facts

- Endpoint: POST https://builtwith.x402.paywithlocus.com/builtwith/product
- Price: $0.055/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-product-search-via-locus-x402-aa2c0e61
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PfOXETeLAbalWyvLt4WVy

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 builtwith-product-search-via-locus-x402-aa2c0e61 -d '<json body>'
```

Example prompt: Search BuiltWith for websites using 'Shopify Plus' and show me the first 50 results — I want to see which major brands are running on it.

## When to prefer this

Use this endpoint when you need to search BuiltWith's product database to find websites using a specific technology or product by name, especially when you want paginated results. Prefer this over domain-lookup endpoints when you're starting from a product/technology name rather than a specific domain. Ideal for lead generation, competitive research, or market adoption analysis at scale across 100M+ websites.

## Known failure modes

- Empty or vague QUERY string returns no meaningful results
- Invalid PAGE or LIMIT values may cause pagination errors or default behavior
- Payment failure via x402 protocol results in no data returned
- Rate limiting or quota exhaustion on the BuiltWith API may return errors
- Highly niche or misspelled product names return empty result sets

## How this service works

Technology profiling for websites — detect tech stacks, find sites using specific technologies, discover domain relationships, trends, and competitive intelligence across 100M+ websites.

## Output

Returns a JSON object with a data field containing product search results from BuiltWith's database, along with payment settlement details (amount paid in USDC) and a request ID with a status URL for tracking. The data payload includes websites and metadata matching the product query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "PAGE": {
   "type": "string"
  },
  "LIMIT": {
   "type": "string"
  },
  "QUERY": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "payment": {
   "scheme": "exact",
   "settledUsdc": "0.001000",
   "authorizedMaxUsdc": "0.001000"
  },
  "request": {
   "id": "00000000-0000-4000-8000-000000000000",
   "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
  },
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-product-search-via-locus-x402-aa2c0e61/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from builtwith.x402.paywithlocus.com](https://www.zero.xyz/host/builtwith.x402.paywithlocus.com/llms.txt)