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How to Connect FastBill to MCP for AI Agents

Manage invoices, customers, and expenses with AI agents via MCP. FastBill is a popular invoicing tool for German freelancers and small businesses.

FastBill Invoicing with AI Agents

FastBill is a popular invoicing and bookkeeping platform for German freelancers and small businesses. By connecting its API to MCP, AI agents can query customers, list invoices, track expenses, and analyze revenue.

Quick Setup

git clone https://github.com/HelpCode-ai/anythingmcp.git
cd anythingmcp && docker compose up -d

Open http://localhost:3000/connectors/store, import the FastBill adapter, and enter your FastBill email and API key.

{
  "mcpServers": {
    "fastbill": { "url": "http://localhost:4000/mcp" }
  }
}

Available Tools

| Tool | Description | |------|-------------| | fastbill_list_customers | List customers with search filtering | | fastbill_list_invoices | List invoices filtered by customer, month, or year | | fastbill_get_invoice | Get full invoice details with line items | | fastbill_list_expenses | List expenses filtered by period | | fastbill_list_revenues | List revenue entries |

Use Cases

  • "Show all unpaid invoices from this month"
  • "How much revenue did I generate in Q1?"
  • "List all customers from Munich"
  • "What are my total expenses for March 2026?"