---
title: "AI: your invoices from your AI assistant · EenFactuurMaken.nl"
description: "Control EenFactuurMaken.nl from ChatGPT, Claude, Cursor, Gemini CLI or Copilot in VS Code with the MCP server and REST API. With Markdown pages, llms.txt and ready-made prompts."
url: "https://eenfactuurmaken.nl/en/ai"
markdown_url: "https://eenfactuurmaken.nl/en/ai.md"
language: "en-GB"
---

AI

# Your invoices, controlled by your AI assistant

Ask your AI assistant to create an invoice, send reminders or give you a VAT overview. EenFactuurMaken.nl has an MCP server, a REST API and a site that AIs can read easily.

[Connect the MCP server](https://eenfactuurmaken.nl/en/docs/mcp) [See the prompts](https://eenfactuurmaken.nl/en/docs/prompts)

Works with

- ChatGPT
- Claude
- Cursor
- Gemini CLI
- Copilot (VS Code)

Just ask

## What you can ask

Just in your own words.

- “Create an invoice for Bakkerij De Vries for 12 hours of web design.”
- “Send reminders for all overdue invoices.”
- “Make a VAT overview for Q3.”
- “Turn these spreadsheet rows into invoice lines.”

[Go to the prompt library](https://eenfactuurmaken.nl/en/docs/prompts)

- You Which invoices are still open with customers in Germany?
- Assistant Two: 2026-0038 to Müller GmbH (€2,400, 9 days overdue) and 2026-0041 to Kaffeehaus Lenz (€640, due Friday). Shall I send Müller a reminder in German?

```
# Fetch all open invoices
curl https://eenfactuurmaken.nl/api/v1/invoices?status=open \
  -H "Authorization: Bearer efm_…"

{ "data": [ … ], "total": 2 }
```

Open standards

## Built to connect

Not a closed app, but open standards.

- ### [MCP server](https://eenfactuurmaken.nl/en/docs/mcp)

  The Model Context Protocol. Your assistant gets tools for customers, products and invoices.

- ### [REST API](https://eenfactuurmaken.nl/en/docs/api)

  Anything the app can do, the API can too. With API keys, on every plan.

- ### [Every page as Markdown](https://eenfactuurmaken.nl/index.md)

  Add .md to any address and you get clean text, ideal for pasting into a chat.

- ### [llms.txt](https://eenfactuurmaken.nl/llms.txt)

  An overview of the site for AIs, with links to all key pages.

- ### [Prompt library](https://eenfactuurmaken.nl/en/docs/prompts)

  Ready-made prompts to copy, or to open directly in ChatGPT or Claude.

- ### [OpenAPI spec](https://eenfactuurmaken.nl/api/v1/openapi.json)

  Have your AI generate a client in your programming language.

Connect safely

## You stay in control

An AI assistant is handy, but an invoice is a legal document.

- You decide which assistant gets access, and you can revoke that access any time.

- Our prompts have the assistant create a draft first and ask for your approval before anything is issued or sent.

- The same checks as in the app: an invoice missing mandatory details can't be issued through AI either.

- You see API keys once and never paste them into a chat. Your assistant signs in through the connection itself.

Why no AI in your invoices?

## We don't let AI write your invoices

EenFactuurMaken.nl itself doesn't use AI to generate text or amounts on your invoices. There are good reasons for that.

- ### Privacy

  Your invoices contain your customers' data. We don't send it to an AI service. If you connect an assistant yourself, you choose which one.

- ### Accuracy

  A language model can get an amount or a VAT rate wrong. On an invoice, that's not acceptable. What's on it, you entered or confirmed.

- ### Predictable

  VAT, totals and numbering are calculated with fixed rules. The same input always gives the same invoice.

## Try it with your own assistant

Create a free account, create an API key or connect the MCP server, and ask your assistant for your first invoice.

[Start for free](https://eenfactuurmaken.nl/en/signup) [Connect the MCP server](https://eenfactuurmaken.nl/en/docs/mcp)