# BuiltWith Tags

> BuiltWith Tags is a paid API for AI agents from BuiltWith at builtwith.mpp.paywithlocus.com, paid per call via MPP, $0.055/call, status unknown (last checked 2026-10-10).

Look up technology tags/categories associated with a given IP address or attribute using BuiltWith's database

## Facts

- Endpoint: POST https://builtwith.mpp.paywithlocus.com/builtwith/tags?utm_source=zero.xyz
- Price: $0.055/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- 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-tags-3bb973ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HsPK-8e3M81B2e88Sk-ka

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-tags-3bb973ac -d '<json body>'
```

Example prompt: Use BuiltWith to look up the technology tags for IP-203.0.113.5 — I want to see what tech categories BuiltWith associates with that IP.

## When to prefer this

Use this endpoint when you need to retrieve technology tags or category classifications for a specific IP address or attribute from BuiltWith's database, particularly when enriching lead data, profiling infrastructure, or categorizing web properties by technology use.

## Known failure modes

- Invalid or unrecognized IP address format — returns error or empty result
- IP or attribute not found in BuiltWith's database — empty tags array
- Malformed LOOKUP value (missing 'IP-' prefix for IPs) — may return incorrect results or error
- Rate limit exceeded — API error response
- Network timeout — request fails with timeout error

## How this service works

Find domains related to an IP address, tag, or site attribute. Use "IP-x.x.x.x" prefix for IP lookups.

## Output

Returns a list of technology tags and categories that BuiltWith associates with the queried IP address or attribute, drawn from BuiltWith's database of 100M+ websites.

## Example request

```json
{
 "LOOKUP": "IP-203.0.113.5"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "LOOKUP"
 ],
 "properties": {
  "LOOKUP": {
   "type": "string",
   "description": "IP address (prefix with \"IP-\") or attribute to look up"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-tags-3bb973ac/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)