# BuiltWith Domain Lookup via Locus x402

> BuiltWith Domain Lookup 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).

Looks up the technology stack and web infrastructure profile of a given domain using BuiltWith data, returning detected technologies, metadata, and attributes.

## Facts

- Endpoint: POST https://builtwith.x402.paywithlocus.com/builtwith/domain
- 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-domain-lookup-via-locus-x402-f88871e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LbDLO-tIINcZHmVVKR2uQ

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-domain-lookup-via-locus-x402-f88871e6 -d '<json body>'
```

Example prompt: Can you look up what technologies shopify.com is using — I want to know their full tech stack including their CMS, CDN, analytics tools, and payment processors, and exclude any dead links from the results?

## When to prefer this

Choose this endpoint when you need authoritative, comprehensive technology stack data for a specific domain backed by BuiltWith's database of 100M+ websites. It is ideal when you need structured, filterable technology profiles including historical detection dates, and when you are willing to pay per-lookup via the x402 micropayment protocol. Prefer this over scraping or manual inspection when you need reliable, categorized tech stack intelligence for competitive analysis, sales prospecting, or market research.

## Known failure modes

- Invalid or unresolvable domain returns empty or error data
- Domain not indexed in BuiltWith database returns no technology results
- Malformed FDRANGE or LDRANGE date format causes filter failure
- Payment failure via x402 protocol results in request not being processed
- Rate limiting or quota exhaustion on the underlying BuiltWith API

## 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

A JSON object containing the detected technologies for the requested domain, including technology names, categories, first and last detected dates, and optional attributes and metadata. The response also includes payment settlement details and a request status URL for tracking.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "NOPII": {
   "type": "string"
  },
  "HIDEDL": {
   "type": "string"
  },
  "LOOKUP": {
   "type": "string"
  },
  "NOATTR": {
   "type": "string"
  },
  "NOMETA": {
   "type": "string"
  },
  "FDRANGE": {
   "type": "string"
  },
  "LDRANGE": {
   "type": "string"
  },
  "HIDETEXT": {
   "type": "string"
  },
  "LIVEONLY": {
   "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-domain-lookup-via-locus-x402-f88871e6/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)