# nimistu MCP — Estonian Business Register for AI assistants

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Connect any MCP-compatible AI assistant (Claude, Cursor, ChatGPT, and more) to the
**Estonian Business Register (Äriregister)** and related open data. Ask about any
Estonian company, person, trademark, or activity sector in plain
language — **free, no API key, read-only** — with every answer traceable to its source.

Powered by **[nimistu.ee](https://nimistu.ee)**, a free, ad-free public register that
aggregates 60+ official Estonian open-data sources, each field carrying its source and
last-update date.

- **Endpoint (Streamable HTTP):** `https://nimistu.ee/api/mcp`
- **Free** — no API key, no signup, read-only
- **Bilingual** — Estonian and English
- **Traceable** — every answer is source- and date-stamped

## Quick start

### Claude Code

```bash
claude mcp add --transport http nimistu https://nimistu.ee/api/mcp
```

### Cursor

Add to `~/.cursor/mcp.json` (global) or `.cursor/mcp.json` (project):

```json
{
  "mcpServers": {
    "nimistu": {
      "url": "https://nimistu.ee/api/mcp"
    }
  }
}
```

### Claude Desktop and other clients

```json
{
  "mcpServers": {
    "nimistu": {
      "url": "https://nimistu.ee/api/mcp"
    }
  }
}
```

Stdio-only clients can bridge via [`mcp-remote`](https://www.npmjs.com/package/mcp-remote):

```json
{
  "mcpServers": {
    "nimistu": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://nimistu.ee/api/mcp"]
    }
  }
}
```

**Transports:** Streamable HTTP at `https://nimistu.ee/api/mcp` (recommended) · SSE at
`https://nimistu.ee/api/sse`.

## What you can ask

You talk to it in natural language — you don't need to know table names or tool details.

- Tell me about an Estonian OÜ — owners, board, financials
- Which companies is a given person connected to?
- What happened in the Estonian Business Register today?
- Top 10 taxpayers and employers in Estonia
- Find trademarks containing a word — and who owns them
- How many retail companies (EMTAK 47.8) are there, and where?
- Compare the 2024 financials of three companies

## Capabilities

Ten tools over the full nimistu.ee dataset:

| Capability | What it covers |
| --- | --- |
| **Company profile** | status, address, activity (EMTAK), VAT, employees, financials, tax debt, board (with appointment dates), owners, trademarks |
| **Annual reports** | every filed majandusaasta aruanne: revenue, profit, employees, equity, assets, liabilities, labour cost, plus computed ratios and the EMTAK sector median |
| **Ownership structure** | subsidiaries, associates, foreign parent, group structure |
| **Person & connections** | a person's current and former ties to Estonian companies (board, shareholder, representative) |
| **Fresh registry events** | what changed in the Estonian Business Register today |
| **Rankings** | curated top lists — taxpayers, employers, procurement winners, MPs in business, and more |
| **Trademark search** | EUIPO trademarks by text, with their owners |
| **Sector lookup** | companies by EMTAK activity code, with counts and locations |
| **EMTAK classification** | resolve and explain Estonian activity codes |

## What it does not cover

Worth knowing before you rely on a negative answer:

- **Registry entry history.** Company profiles are current state only — no kanded,
  no määrused, no pending menetlused. An answer about a company is about today,
  and will not mention an ongoing proceeding.
- **Beneficial owners.** Estonia's FIU withdrew public access to the beneficial
  owner register on 10 July 2026 following the CJEU ruling, so this server no
  longer returns them.
- **Court decisions and public-authority documents.** Separate corpora, served by
  [lahend.ee](https://lahend.ee/mcp) and
  [dokumendiregister.ee](https://dokumendiregister.ee/mcp) respectively.
- **Real-time data.** Sources refresh on their own cadences, mostly nightly.
  `get_company` returns `dataAsOf` so you can see how stale an answer is rather
  than having to assume.

## Data sources and attribution

nimistu aggregates 60+ official sources — Äriregister (RIK), the Estonian Tax and
Customs Board (EMTA), EUIPO, public-procurement registers, sanctions lists, and more.
Each field shows its source and last-update date.

- Sources: <https://nimistu.ee/allikad>
- Usage terms: <https://nimistu.ee/litsents>
- Machine-readable index for agents: <https://nimistu.ee/llms.txt>

## Links

- Website — <https://nimistu.ee>
- MCP connection page — <https://nimistu.ee/mcp>

## License

The configuration examples and documentation in this repository are released under the
[MIT License](LICENSE). The nimistu.ee service and the underlying register data have
their own terms — see <https://nimistu.ee/litsents>.