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Sign in, install the FastBill Invoicing in one click, paste the credentials, mint an MCP API key — done. No Docker, no git clone, no local server to run.
TL;DR
Connect FastBill invoicing to Claude AI using MCP. Query customers, invoices, expenses and revenue data with natural language. Step-by-step guide.
Connect FastBill to Claude
FastBill is one of Germany's most popular invoicing tools for freelancers and small businesses. With AnythingMCP, you can connect FastBill's API directly to Claude, enabling natural language queries over your financial data.
What You Can Do
Once connected, ask Claude things like:
- "Show me all unpaid invoices from this quarter"
- "How much revenue did customer Müller GmbH generate last year?"
- "List my top 10 customers by invoice volume"
- "What are my total expenses for March?"
Step 1: Set Up AnythingMCP
git clone https://github.com/HelpCode-ai/anythingmcp.git
cd anythingmcp && docker compose up -d
Or use AnythingMCP Cloud for instant setup without Docker.
Step 2: Import the FastBill Adapter
- Open
http://localhost:3000/connectors/store - Find FastBill Invoicing in the adapter list
- Click Import — you'll be prompted for your credentials
- Enter your FastBill email and API key (find it in FastBill under Settings → API)
Step 3: Assign to an MCP Server
After import, choose which MCP server should expose FastBill tools. You can select an existing one or create a new MCP server.
Step 4: Connect Claude
Add the MCP server to your Claude Desktop configuration:
{
"mcpServers": {
"fastbill": { "url": "http://localhost:4000/mcp" }
}
}
Available Tools
| Tool | Description |
|---|---|
fastbill_list_customers | Search and list customers |
fastbill_list_invoices | List invoices by customer, month, or year |
fastbill_get_invoice | Get full invoice details with line items |
fastbill_list_expenses | List expenses by period |
fastbill_list_revenues | List revenue entries |
Why AnythingMCP?
Unlike building a custom integration, AnythingMCP gives you a pre-built FastBill adapter with one-click import. Your API credentials are encrypted, and all requests are logged in the audit trail. You can combine FastBill with other connectors (DHL, weclapp, etc.) in a single MCP server.
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