# BuiltWith Keywords API

> BuiltWith Keywords API is a paid API for AI agents from api.builtwith.com, paid per call via x402, $0.0495/call, status unknown (last checked 2026-09-14).

Returns keyword and tag metadata associated with technologies detected on a given domain

## Facts

- Endpoint: POST https://api.builtwith.com/agent/keywords
- Price: $0.0495/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-keywords-api-337c65ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ei3qVCthmgcbrAxSMJqfX

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-api-337c65ce -d '<json body>'
```

Example prompt: Can you look up what technology keywords and tags BuiltWith has on record for shopify.com?

## When to prefer this

Use this endpoint when you need keyword or tag-level technology metadata for a domain from BuiltWith's database — particularly useful for sales intelligence, lead enrichment, or competitive research workflows where you want to know what technology categories or platforms a site is associated with. Prefer this over generic web scraping when you need structured, pre-classified technology signal rather than raw HTML analysis.

## Known failure modes

- Domain not found in BuiltWith database — empty Results array returned
- Invalid domain format (e.g. including URL path or protocol) — validation error
- Domain string too long (>253 characters) — schema validation failure
- Insufficient BuiltWith data coverage for obscure or new domains — sparse or empty results
- Payment or authorization failure — request not processed

## How this service works

BuiltWith API Overview

## Output

A JSON object with a Results array containing keyword and tag data associated with technologies detected on the requested domain, including technology names, categories, and related metadata. Fields vary based on available data for the domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 253,
   "minLength": 1,
   "description": "Domain name to research, for example example.com. Do not include a URL path."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "Results": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-keywords-api-337c65ce/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.builtwith.com](https://www.zero.xyz/host/api.builtwith.com/llms.txt)