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Full REST API, webhooks, OAuth 2.0, and native n8n nodes – cashwerk integrates seamlessly with your existing systems.
cashwerk is not a siloed solution. Through our open API platform, you connect CRM, invoicing, and project management with your preferred tools. Automate workflows, synchronize data, and unlock new efficiency gains.
Full programmatic access to all cashwerk modules.
Our REST API covers all modules: CRM, invoices, quotations, projects, tasks, deals, time tracking, and more. The interactive OpenAPI documentation via Redocly makes integration straightforward and transparent for developers.
Complete interactive API documentation via Redocly. Test endpoints directly in your browser.
Stable, versioned endpoints (currently v1) with a clear migration strategy for future versions.
Create, read, update, and delete all business data – from contacts to invoices to projects.
Comprehensive coverage of all business modules with consistent JSON structure and pagination.
curl -X GET \
https://production.cashwerk.io/api/v1/crm/contacts/organization/{orgId}/contacts \
-H "X-API-Key: your_api_key" \
-H "Content-Type: application/json"
# Response: 200 OK
{
"success": true,
"data": [...],
"message": "OK",
"statusCode": 200
}Two secure methods for every use case.
Header-based authentication (X-API-Key) for server-side integrations and automated processes.
Standard OAuth flow with consent screen for third-party apps. Securely delegated permissions without sharing passwords.
React to business events in real time.
Webhooks automatically notify your system whenever data changes in cashwerk – when a record is created, updated, or deleted. Every event has the form entity.action (e.g. contact.create, deal.update). With test ping and automatic retry mechanism.
Low-code automation with 300+ nodes.
cashwerk offers native n8n nodes for visual workflow automation. Connect cashwerk with over 300 other services – without writing a single line of code.
CRUD operations for contacts, companies, invoices, quotations, projects, tasks, deals, and time entries.
Webhook-based triggers that automatically start workflows when business data changes.
441+ Tools für Claude, ChatGPT, Cursor IDE und jeden MCP-kompatiblen KI-Assistenten.
Steuern Sie Ihr CRM, Rechnungen, Projekte und Zeiterfassung per natürlicher Sprache — über das offene Model Context Protocol. Gehostet auf europäischen Servern, DSGVO-konform, Setup in 3 Minuten.
{
"mcpServers": {
"cashwerk": {
"url": "https://mcp.cashwerk.io/mcp",
"headers": {
"Authorization": "Bearer YOUR_KEY"
}
}
}
}Seamless connections with leading business tools.
Payment processing, SEPA direct debit, credit card, subscription management, and automatic invoicing.
Accounting export and document transfer. Use cashwerk for CRM and invoicing, sevDesk for financial accounting.
Data export for Lexware accounting. Keep your invoice data synchronized between both systems.
DATEV export for your tax advisor. Generate DATEV-compatible files (EXTF-CSV, DXSO-XML) with one click – export-only, no connector account required.
Hosted in the EU – developed in Europe
Fully data protection compliant
Servers only in Germany
Sustainable & responsible
Start for free. No credit card required. Data stays in Germany.