builtwith.com

# BuiltWith

> Find out what websites are built with.

BuiltWith detects the technologies used on any website including CMS, ecommerce platforms, analytics,
frameworks, hosting providers, and more.

## Start Here (For LLMs and AI Agents)

Use the API-focused LLM guide first:
- https://api.builtwith.com/llms.txt

This file is a high-level product map. The API LLM guide above contains detailed endpoint usage.
A full version of this product map is at https://builtwith.com/llms-full.txt and the full API
reference is at https://api.builtwith.com/llms-full.txt.

## Core BuiltWith Links

- Website lookup: `https://builtwith.com/[domain]`
  - Example: https://builtwith.com/example.org
- Natural language Ask tool: https://builtwith.com/ask
- Technology trends and market movement: https://trends.builtwith.com
- MCP endpoint for AI integration: https://api.builtwith.com/mcp
- API LLM guide (primary): https://api.builtwith.com/llms.txt

## Discovery Endpoints

BuiltWith publishes the following `.well-known` resources for agents, API clients, and integration discovery:

- Agent Skills Discovery index: https://builtwith.com/.well-known/agent-skills/index.json
- BuiltWith API agent skill: https://builtwith.com/.well-known/agent-skills/builtwith-api/SKILL.md
- MCP discovery manifest: https://builtwith.com/.well-known/mcp.json
- Agent card: https://builtwith.com/.well-known/agent-card.json
- API catalog: https://builtwith.com/.well-known/api-catalog
- OAuth authorization server metadata: https://builtwith.com/.well-known/oauth-authorization-server
- OAuth protected resource metadata: https://builtwith.com/.well-known/oauth-protected-resource
- OpenAI plugin/app manifest: https://builtwith.com/.well-known/openai.json
- HTTP message signatures directory: https://builtwith.com/.well-known/http-message-signatures-directory
- Security contact policy: https://builtwith.com/.well-known/security.txt

## Billing And Credit Endpoints

BuiltWith exposes MPPX credit and spending-limit endpoints on the API host. The same paths are discoverable from `builtwith.com` as redirects to `api.builtwith.com`.

- Credit balance: `GET https://api.builtwith.com/mppx/api-discovery`
- Spending limits: `GET https://api.builtwith.com/mppx/api-configuration`
- Credit purchase: `POST https://api.builtwith.com/mppx/api-purchase`
- Local OpenAPI discovery: `GET https://api.builtwith.com/mppx/openapi.json`
- BuiltWith.com aliases:
  - `GET https://builtwith.com/mppx/api-discovery`
  - `GET https://builtwith.com/mppx/api-configuration`
  - `POST https://builtwith.com/mppx/api-purchase`
  - `GET https://builtwith.com/mppx/openapi.json`

## Programmatic Access

For direct API requests, use the official API docs and endpoint details:
- https://api.builtwith.com

Popular API families include:
- Domain technology lookup
- Technology and company lists
- Relationships / related sites
- Trust and risk signals
- Redirect and keyword data
- API-based trends data

## Notes

- Bots/AI agents may be blocked on interactive website pages.
- For reliable automated access, use the API and MCP routes.