# BuiltWith Free Domain Tech Stack Summary

> BuiltWith Free Domain Tech Stack Summary is a paid API for AI agents from BuiltWith at builtwith.mpp.paywithlocus.com, paid per call via MPP, $0.015/call, status unknown (last checked 2026-10-09).

Returns a summarized technology profile for a given domain, detecting its tech stack across categories like analytics, frameworks, CDN, and more.

## Facts

- Endpoint: POST https://builtwith.mpp.paywithlocus.com/builtwith/free?utm_source=zero.xyz
- Price: $0.015/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Provider: BuiltWith
- Docs: https://api.builtwith.com
- Website: https://builtwith.com
- Tags: technology-profiling, tech-stack, competitive-intel, domains, data
- Canonical page: https://www.zero.xyz/c/builtwith-free-95bf1ed3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N57SAExvpIqZUWgIY5zCR

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-free-95bf1ed3 -d '<json body>'
```

Example prompt: Can you give me a summary of the tech stack for shopify.com — what CMS, analytics, CDN, and frameworks they're using?

## When to prefer this

Use this endpoint when you need a quick, cost-effective technology summary for a domain without requiring the full detailed breakdown. It is ideal for competitive research, lead qualification, or tech stack audits at scale. Prefer the full Domain Lookup endpoint when you need exhaustive technology data.

## Known failure modes

- Unknown or unindexed domain returns empty or minimal result
- Invalid domain format causes input validation error
- Domain with no crawl history returns no technology data
- Large response may be truncated as indicated by _truncated flag in example

## How this service works

Lightweight tech summary — group counts (web server, CMS, JS, SSL, etc.) with live/dead counts and category breakdowns.

## Output

A summarized technology profile for the queried domain, listing detected technologies grouped by category (e.g. analytics, CMS, hosting, CDN, JavaScript frameworks). The response is a structured summary rather than a full deep-dive report.

## Example request

```json
{
 "LOOKUP": "example.com"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "LOOKUP"
 ],
 "properties": {
  "LOOKUP": {
   "type": "string",
   "description": "Domain to summarize"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-free-95bf1ed3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from builtwith.mpp.paywithlocus.com](https://www.zero.xyz/host/builtwith.mpp.paywithlocus.com/llms.txt)