# BuiltWith Agent Ask

> BuiltWith Agent Ask is a paid API for AI agents from api.builtwith.com, paid per call via x402, $0.0495/call, status unknown (last checked 2026-09-15).

Accepts a natural-language query to find websites that use specific technologies, returning a list of matching domains with BuiltWith tech-stack data

## Facts

- Endpoint: POST https://api.builtwith.com/agent/ask
- Price: $0.0495/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-agent-ask-293a2038
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4c-1nySYhz0ws1YjGQ5jB

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-agent-ask-293a2038 -d '<json body>'
```

Example prompt: Use BuiltWith to find me a list of websites that are running Shopify as their e-commerce platform and also using Klaviyo for email marketing — include any extra metadata you can get.

## When to prefer this

Choose this endpoint when you need to discover websites filtered by specific technology usage using plain-language queries, rather than building complex programmatic filters. Ideal for sales prospecting, competitive intelligence, or market research where the user can describe what they want in natural language. Prefer it over raw BuiltWith REST endpoints when you want to skip API parameter construction and just describe the target website profile conversationally.

## Known failure modes

- Empty Results array if no websites match the query criteria
- Vague or ambiguous natural-language query produces irrelevant or broad results
- Query exceeds 1000 character limit returns validation error
- Payment failure or insufficient USDC balance blocks the request
- Rate limiting or quota exceeded on the BuiltWith API side

## How this service works

BuiltWith API Overview

## Output

A JSON object with a Results array, where each entry represents a matching website and may include domain name, detected technologies, and additional BuiltWith metadata (when the meta flag is enabled). Fields vary based on available data and query scope.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "meta": {
   "type": "boolean",
   "default": false,
   "description": "Include additional BuiltWith metadata when available."
  },
  "query": {
   "type": "string",
   "maxLength": 1000,
   "minLength": 1,
   "description": "Natural-language description of the websites to find."
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-agent-ask-293a2038/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)