# BuiltWith Technology Lists via Locus x402

> BuiltWith Technology Lists 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 2026-09-15).

Returns a paginated list of websites using a specified technology, sourced from BuiltWith's database of 100M+ websites.

## Facts

- Endpoint: POST https://builtwith.x402.paywithlocus.com/builtwith/lists
- Price: $0.055/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-technology-lists-via-locus-x402-1a1b93b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wE1wbNvV_1vxJ5QzzFIF1

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-technology-lists-via-locus-x402-1a1b93b4 -d '<json body>'
```

Example prompt: Give me a list of up to 100 websites that use Shopify, sorted by default order — include metadata in the results.

## When to prefer this

Use this endpoint when you need a bulk list of domains using a specific named technology — ideal for lead generation, market research, or competitive intelligence at scale. Prefer this over single-domain lookup endpoints when your goal is discovering which sites use a given tech rather than profiling a single domain. Best suited for agents that need paginated access to BuiltWith's full technology adoption dataset.

## Known failure modes

- Invalid or unrecognized technology name returns empty or error response
- AMOUNT exceeding 500 results in validation error or capped response
- Missing TECH parameter may return an error or empty dataset
- Invalid OFFSET token causes pagination failure
- Payment failure via x402 protocol blocks request from being processed
- Rate limiting or quota exhaustion may return 402 or 429 errors

## How this service works

Locus public pay-per-use API

## Output

A JSON object containing a list of websites that use the specified technology, along with optional metadata about each domain, a pagination offset token for fetching the next page, and payment settlement details including USDC amounts charged.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "META": {
   "type": "string"
  },
  "TECH": {
   "type": "string"
  },
  "ORDER": {
   "type": "string"
  },
  "AMOUNT": {
   "type": "string"
  },
  "OFFSET": {
   "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-technology-lists-via-locus-x402-1a1b93b4/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)