Building

A startup database built for agents instead of analysts.

Startup data an agent can query. Companies, funding rounds, headcount by quarter, open roles, with a source URL on every fact. There is no dashboard.

Why it exists

I have built this before

Mattermark was company profiles, saved screens, and curated lists for deal flow. People paid for the dashboard. The work underneath it was collecting facts about companies and keeping them current.

The human never sits in front of a filter builder

You ask your agent. The agent queries the graph, builds the screen, and writes the memo. Answers are tool results. The agent writes the prose.

Every fact carries its source

Each field comes with the URL it was fetched from, the date, and whether it has been verified. A contributed fact goes in as unverified and stays that way until the source checks out.

The gaps are on the front page

Coverage is published per field and per country, so an agent can say it does not know. An agent that cannot see the gaps fills them with guesses.

The code is public. Most of it was built with Claude, and the repository is the record of that. dmorrill/startupgraph on GitHub

How it got here

  1. December 2025

    An open source startup database

    Companies, headcount over time, funding rounds, and news mentions, for investors, job seekers, and anyone curious. A web page to browse them. The long-term idea was to track every tech startup and detect new ones automatically.

  2. February 2026

    The import push

    Importers for Y Combinator, Wikipedia, SEC filings, GitHub organisations, Hacker News, Companies House, and Product Hunt. The graph is now about 70,000 companies, most of them from the UK register.

  3. July 2026

    Agent-first

    An agent-first Mattermark. Agents screen, research, and monitor through MCP and the API, and the phone shows what they produced. The research layer became first-class data: lists, screens, notes, and signals, each one recording which agent wrote it and why.

  4. October 2026

    No dashboard at all

    The landing page is the whole UI. A key arrives by email, every call carries one, and the coverage table sits on the front page next to the tools. Contribute a fact with a source and your key earns calls once it verifies.

What it will not be

There is no dashboard, and that is the product decision rather than a gap. Mattermark sold a filter builder to analysts. This assumes you have an agent and sells the agent a workspace. Every call carries a key, free ones included, so abuse is one key to cut and every key's usage is visible.

Introducing Mattermark, the deal intelligence company (2014)

Where it is

Built in public, and most of it built with Claude. The repository is public under an MIT licence. The graph has about 70,000 companies and funding rounds for only a few dozen of them, which is the gap the whole page is about. The domain does not resolve yet.

checked October 12, 2026

The Groupthink story, with its numbers