# Domduck

> Domduck tracks domain reputation over time and keeps the history permanently.
> It reads Ahrefs Domain Rating, Tranco rank, registration date, TLS state, DNS
> records, OpenPageRank, Cloudflare Radar categories and robots.txt AI crawler
> policy for every tracked domain, once a day, and never overwrites a reading.
> Unlimited domains, free, no tier cap.

Every reading is an append-only observation stamped with the day it was taken.
A missing day means nobody looked, not that the value was zero. That distinction
is the product: a rank series with a zero in it reads as the best result ever
recorded, and it would be a lie.

These AI crawlers are tracked by name: GPTBot and OAI-SearchBot (OpenAI), ClaudeBot (Anthropic), PerplexityBot (Perplexity), Google-Extended (Google), Applebot-Extended (Apple), CCBot (Common Crawl) and Bytespider (ByteDance). Each one is
recorded as allowed, disallowed or unspecified. Unspecified is not allowed: a
catch-all `Disallow: /` blocks an agent the file never names.

Domduck exposes three surfaces: a dashboard, an MCP server for agents, and an
embeddable Domain Rating badge.

If you are an agent and you want to call Domduck rather than read about it,
start at the MCP server documentation below. There is a public MCP server with
no account, no key and no sign-up at `POST https://domduck.com/api/mcp/public`,
which is the shortest path from this file to a working tool call.

## Product

- [Domduck](https://domduck.com/): What it tracks, what it costs, and an anonymous lookup that needs no account.
- [Status](https://domduck.com/status): Whether each data source collected today. Coverage, not last-write time, so one hand-checked domain cannot make a stalled source read as healthy.
- [Changelog](https://domduck.com/changelog): What shipped and when.
- [About](https://domduck.com/about): Who runs Domduck and why the history is the point.

## For agents

- [MCP server](https://domduck.com/docs/mcp.md): Ten tools over Streamable HTTP, with a bearer key. The connection block for every client, then a reference for every tool.
- [Public MCP server](https://domduck.com/docs/mcp-public.md): Three read-only tools, no account and no key, ten requests a minute per IP.
- [AI crawler policy](https://domduck.com/docs/ai-crawlers.md): The eight agents Domduck tracks, the three states each one can be in, and why unspecified is not the same as allowed.
- [HTTP API](https://domduck.com/docs/api.md): One domain with no account through POST /api/lookup, and the SVG badge at GET /api/badge/{domain}.
- [Data sources](https://domduck.com/docs/sources.md): Every source Domduck reads, what its numbers mean, which direction is better, and how often it is re-read.

## Optional

- [Sign in](https://domduck.com/sign-in): Magic link only. There are no passwords and no reset flow, because the link is the reset.
- [Privacy](https://domduck.com/privacy): What is stored, and what is not.
- [Terms](https://domduck.com/terms): Terms of use.