> ## Documentation Index
> Fetch the complete documentation index at: https://docs.otbstudio.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Belgian company data API and MCP server

> Developer docs for OTB Studio: every Belgian company (KBO/BCE) with its directors, shareholders and filed annual accounts, through a REST API and an MCP server.

Every Belgian company on the register, live and ceased, with its directors, shareholders and up to 20 years of filed annual accounts. Query it from your code over REST, or let Claude, Cursor or ChatGPT answer from it directly over MCP. Every record carries the date it was last refreshed and a reference to the filing it came from.

## Get started

**1. Create an account**

Sign up at [app.otbstudio.ai](https://app.otbstudio.ai/auth/sign-up) and confirm your email address.

**2. Choose a plan**

Every call needs a plan, search included. There is no free tier. See [Pricing](/pricing.md).

**3. Connect**

Add the connector in Claude, or create an API key in the dashboard and use it below.

## Connect an agent

In **Claude**, add `https://mcp.otbstudio.ai/mcp` as a custom connector and sign in with your OTB Studio account. Nothing else to set up. See [The MCP server](/mcp.md).

In **Claude Code, Cursor and other MCP clients**, [create a key](/authentication.md) and add:

```json theme={null}
{
  "mcpServers": {
    "otb-studio": {
      "type": "http",
      "url": "https://mcp.otbstudio.ai/mcp",
      "headers": { "Authorization": "Bearer otb_live_…" }
    }
  }
}
```

## Or call the REST API

```bash theme={null}
curl -s "https://api.otbstudio.ai/v1/companies?q=noordkaap&limit=2" \
  -H "Authorization: Bearer $OTB_KEY"
```

See [The REST API](/rest.md), or the [API reference](/api-reference/en/companies/search-companies.md). MCP and REST read the same data through the same code, so both give the same answer, and one key works for both.

## What the register holds

> **3.3M**
>
> companies on the register, live and ceased

> **4.9M**
>
> director and mandate records

> **8.45M**
>
> filed annual accounts

Questions or problems: [engineering@otbstudio.ai](mailto:engineering@otbstudio.ai).


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