# BuiltWith Technology Change Detection

> BuiltWith Technology Change Detection is a paid API for AI agents from api.builtwith.com, paid per call via x402, $0.0495/call, status unknown (last checked 2026-09-13).

Detects technology stack changes on a domain over time, reporting what was added or removed

## Facts

- Endpoint: POST https://api.builtwith.com/agent/changes
- Price: $0.0495/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-technology-change-detection-3f0e2b27
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SahGSxFarmqgeZRHC2tlM

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-technology-change-detection-3f0e2b27 -d '<json body>'
```

Example prompt: Can you check what technology changes BuiltWith has detected on shopify.com since last month — anything added or dropped?

## When to prefer this

Choose this endpoint when you specifically need to track what has changed in a website's technology stack over time, rather than just getting a current snapshot. It is ideal for competitive intelligence workflows, sales prospecting triggers, and partner churn detection where temporal change signals matter. Prefer this over a general technology lookup when the user's question is about what is different, new, or dropped rather than what is currently present.

## Known failure modes

- Domain not found in BuiltWith database returns empty Results array
- Invalid domain format (URL path included) causes request failure
- Unknown or unsupported time boundary string may return no filtered results
- Rate limiting or payment failure returns HTTP error
- Very new domains with no crawl history return empty results

## How this service works

BuiltWith API Overview

## Output

A JSON object with a Results array containing detected technology changes for the domain, including technologies added and removed within the specified time period, with metadata such as technology category, dates, and change type.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "since": {
   "type": "string",
   "minLength": 1,
   "description": "Optional BuiltWith time boundary, for example 'last month'."
  },
  "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-technology-change-detection-3f0e2b27/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)