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 Muse 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 Muse
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 Muse, enabling natural language queries over your financial data.
What You Can Do
Once connected, ask Muse 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 Muse
The quickstart above listens on localhost only. For Muse, install the connector on AnythingMCP Cloud instead, or on an instance with a public HTTPS address.
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.
Muse adds remote MCP servers as custom connectors and signs in to them with OAuth.
- In Muse, open Settings → Connectors and choose Add custom connector.
- Paste the MCP server URL
https://cloud.anythingmcp.com/mcp/YOUR_SERVER_ID. - Muse opens the AnythingMCP sign-in page: sign in and approve access.
- In a chat, ask Muse for something that needs the
FastBilltools.
You can also set it up from a chat, on the web, in the iOS and Android apps or in WhatsApp. Send Muse this message:
Create a Custom Connector for a new remote MCP server, then connect to it:
Name: AnythingMCP
Transport: remote streamable HTTP
URL: https://cloud.anythingmcp.com/mcp/YOUR_SERVER_ID
Auth: OAuth
Self-hosting? Use your instance's public HTTPS address instead of https://cloud.anythingmcp.com. Muse connects from Meta's cloud, so localhost does not work.
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 is Muse available? Meta currently offers Muse in the US and Canada, on the web, in the iOS and Android apps and in WhatsApp.
Does Meta review this connector? No. Meta doesn't review custom connectors. Muse sees only the tools you switched on for this MCP server in AnythingMCP, and you can disconnect it anytime under Settings → Connectors.
Next steps
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