Firstline is a developer-focused company data platform providing API access to commercial register and company information for Austria and Germany. The service helps businesses integrate company data into their own applications and workflows, with self-service registration and an API key available immediately. Its data offering includes company names, legal forms, operating status, headquarters, contact details, managers and financial information. Register data is regularly updated from official sources.

Firstline supports use cases such as internal business tools, KYB and compliance checks, CRM lead enrichment, and due diligence for mergers, acquisitions and investments. Developers can access an OpenAPI specification, Postman collection, TypeScript and Python SDKs, an n8n node, and comprehensive documentation. The platform offers a free tier with 100 requests per month and a Pro plan at €49 per month with 100,000 requests included. No credit card is required for the free plan, and subscriptions have no minimum contract and can be cancelled at any time. Priority support is included with Pro, while webhooks are listed as coming soon.