Skip the install. Get this working in under 2 minutes.
Start a free trial on cloud.anythingmcp.com, add the FastBill Invoicing in one click, then point your AI client (Claude, ChatGPT, Copilot or Cursor) at the generated MCP endpoint. No Docker, no git clone, zero engineering experience required.
Summary
Connect FastBill invoicing to Gemini using MCP. Query customers, invoices, expenses and revenue data with natural language. Step-by-step guide.
Try asking
Example prompts for FastBill Invoicing
Click any prompt to copy it. Paste into Claude, ChatGPT, Cursor, Gemini, Copilot or OpenClaw to run it against this connector.
Claude is AI and can make mistakes. Please double-check responses.
Connect FastBill to Gemini
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 Gemini, enabling natural language queries over your financial data.
What You Can Do
Once connected, ask Gemini 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
curl -fsSL https://raw.githubusercontent.com/HelpCode-ai/anythingmcp/main/docker-compose.quickstart.yml -o docker-compose.yml
printf 'JWT_SECRET=%s\nENCRYPTION_KEY=%s\n' "$(openssl rand -hex 32)" "$(openssl rand -hex 32)" > .env
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 Gemini
Your server URL: in AnythingMCP, open MCP Servers → the server this connector is on, and copy its URL (
https://cloud.anythingmcp.com/mcp/…). Use it wherever this guide showsYOUR_SERVER_ID.
Gemini CLI reads MCP servers from ~/.gemini/settings.json (on Windows %USERPROFILE%\.gemini\settings.json). Add:
{
"mcpServers": {
"anythingmcp": {
"httpUrl": "https://cloud.anythingmcp.com/mcp/YOUR_SERVER_ID",
"headers": { "X-API-Key": "YOUR_MCP_API_KEY" }
}
}
}
- Create an MCP API key in AnythingMCP under MCP Servers → your server → API keys, and paste it in place of
YOUR_MCP_API_KEY. - Save the file and restart
gemini. - Run
/mcpinside Gemini CLI (orgemini mcp listin your shell) —anythingmcpshould show as connected. - Start prompting — Gemini CLI can now call the
FastBilltools.
Self-hosting with the quickstart above? Use your server's local endpoint http://localhost:4000/mcp/<server-id> as the URL.
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.
FAQ
Where does Gemini CLI look for MCP servers? In ~/.gemini/settings.json for your user, or in .gemini/settings.json inside a project. gemini mcp list shows each server and whether it connects.
Next steps
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