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Lexware Office (lexoffice) API and MCP server

Lexware Office has no API for sending an invoice by email, recording a payment or cancelling an invoice, and the API it does have needs version XL. Sign in to Lexware Office once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with Lexware Office (lexoffice).

Lexware Office (lexoffice) has no API for this. So we run one for you.

Lexware Office (lexoffice)'s own API, a GitHub MCP server and Cotlet compared
What you need Lexware Office (lexoffice)'s APIGitHub MCP serverCotlet
Sending, payments, cancelling No Partly Yes, 14 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Lexware Office (lexoffice) changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 14, 2026. Sources: Lexware Office Public API · Lexware Office API documentation · Lexware Office Public API license and terms of use · Lexware Office prices and versions

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to Lexware Office (lexoffice) in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Lexware Office (lexoffice) to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 14 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. Lexware Office (lexoffice) and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/lexware-office with its own method and path, such as POST /api/v1/lexware-office/documents/{document_id}/finalize, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Lexware Office (lexoffice) API and MCP server do?

14 tools on your own Lexware Office (lexoffice) account. Agents call them as operations of the MCP tools lexware_office_read and lexware_office_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Lexware Office (lexoffice) tools in Cotlet's MCP server and REST API
Tool What it does Access
list_documents Invoices, quotes, order confirmations and delivery notes, filtered by type and status. read
get_document One document with its lines, totals, status and reminders already sent. read
list_contacts Customers and suppliers saved in Lexware Office, searchable by name or email. read
list_receipts Receipts in Lexware Office with the fields the automatic recognition filled in. read
download_document_pdf The PDF of a finalised invoice or quote. read
create_contact Save a new customer or supplier in Lexware Office. write
create_invoice Save a draft invoice for a contact. Nothing is sent and no number is assigned yet. write
create_quotation Save a draft quote for a contact. Nothing is sent. write
finalize_document Finalise a draft invoice or quote: it gets its number and can no longer be edited. writeasks first
send_document Email a finalised invoice or quote to the customer with its PDF attached. writeasks first
record_payment Record a customer payment on an open invoice. writeasks first
send_payment_reminder Send a Mahnung or Zahlungserinnerung for an overdue invoice, with an optional fee. writeasks first
cancel_invoice Cancel (stornieren) a finalised invoice. The number stays blocked. writeasks first
upload_receipt Upload a supplier invoice or receipt file for bookkeeping. It lands in "Zu prüfen". write

Scroll the table for all 14 tools.

Ask in plain words. Your agent does the rest.

All Lexware Office (lexoffice) use cases

Is it safe to connect Lexware Office (lexoffice)?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the Lexware Office (lexoffice) API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while Lexware Office (lexoffice) is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does Lexware Office (lexoffice) have an API?

Yes, Lexware Office has a public REST API with an API key (checked 14 Oct 2026). It covers quotes, order confirmations, invoices, contacts, file uploads, payments (read only) and webhooks, but only from version XL, and Lexware publishes no MCP server of its own. You generate the key yourself, and the API cannot change an invoice once it is finalised.

How do I get access?

Sign up free, open Lexware Office (lexoffice) under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 14 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to Lexware Office (lexoffice) yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Lexware Office (lexoffice) sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: finalize_document, send_document, record_payment, send_payment_reminder, cancel_invoice wait for your OK by default. You can switch that off per tool for scheduled runs.

Can my agent undo a finalised invoice?

Only the way you would: cancel_invoice clicks Stornieren, and the corrected invoice is a new document. A cancellation cannot be undone and the cancelled number stays blocked, which Lexware says GoBD requires.

Should I use a Lexware Office (lexoffice) MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when Lexware Office (lexoffice) changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with Lexware Office (lexoffice)?

No. Cotlet is independent and not affiliated with Lexware Office (lexoffice).

Give your agent access to Lexware Office (lexoffice).

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