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

# Introduction

> Getting started with the OpenRegister API

## Welcome to OpenRegister

Get instant access to data on 4+ million German companies from official sources. Search for companies, check ownership structures, view financials, and retrieve official documents - all through a simple API.

## Getting Started

Ready to start? Check out our [Quickstart Guide](/quickstart) to get up and running in minutes.

1. [Sign up](https://openregister.de) and grab your API key (no credit card required)
2. Start with 50 free requests per month
3. Follow the [Quickstart](/quickstart) to integrate

## What You Can Do

**Company Information** - Names, registration details, management teams, addresses, and contact info

**Find Companies** - Search by name, website, or location. Filter by industry, size, and legal form

**Ownership** - See who owns what, track beneficial owners, explore corporate structures

**Financials** - Balance sheets, revenue, and key metrics from published reports

**Documents** - Official register documents directly from the source

## Popular Use Cases

Companies use OpenRegister for **compliance and KYC**, **sales intelligence**, **due diligence**, **market research**, and **legal services**. If you work with German companies, we probably have the data you need.

## Need Help?

Questions? Want to discuss your use case? Just reach out at [founders@openregister.de](mailto:founders@openregister.de). We're here to help you succeed.

## Data Sources

Access three comprehensive data sources through our API:

<CardGroup>
  <Card title="Handelsregister" icon="building" href="sources/handelsregister">
    Official register data for 4+ million companies - management, ownership, registration details, and documents
  </Card>

  <Card title="Bundesanzeiger" icon="chart-line" href="sources/bundesanzeiger">
    Financial statements and reports - balance sheets, revenue, and key metrics published by companies
  </Card>

  <Card title="Web Data" icon="globe" href="sources/web-data">
    Real-world contact details - emails, phone numbers, and social media profiles from company websites
  </Card>
</CardGroup>