# BuiltWith Keywords Lookup via Locus x402

> BuiltWith Keywords Lookup via Locus x402 is a paid API for AI agents from builtwith.x402.paywithlocus.com, paid per call via x402, $0.035/call, status unknown (last checked 2026-09-15).

Extracts SEO/meta keywords associated with a given domain using BuiltWith's database of 100M+ websites.

## Facts

- Endpoint: POST https://builtwith.x402.paywithlocus.com/builtwith/keywords
- Price: $0.035/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-keywords-lookup-via-locus-x402-82c959ab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D7xf97R0T5Tmb7L6AxRYL

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-keywords-lookup-via-locus-x402-82c959ab -d '<json body>'
```

Example prompt: What keywords is shopify.com associated with according to BuiltWith? I want to understand their SEO targeting.

## When to prefer this

Use this endpoint when you specifically need keyword metadata associated with a domain as indexed by BuiltWith, particularly for SEO analysis, competitive keyword research, or domain enrichment workflows. Prefer this over generic web scraping when you want structured, pre-indexed data from BuiltWith's 100M+ site database rather than live page content.

## Known failure modes

- Domain not found in BuiltWith database — returns empty data object
- Invalid or malformed domain string causes lookup failure
- Payment not settled — x402 payment protocol failure blocks the request
- Rate limiting or quota exceeded on the BuiltWith data source
- Network timeout if BuiltWith upstream is slow

## 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 keyword data extracted from BuiltWith's profile of the requested domain, along with payment settlement metadata (settled USDC amount, authorized max) and a request tracking ID with a status URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "LOOKUP": {
   "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-keywords-lookup-via-locus-x402-82c959ab/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)