Lexware Office MCP server

Read Lexware Office contacts, articles, invoices and vouchers; create contacts and draft invoices. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Lexware Office50 free tool calls a month

What can I ask?

Turn on the Lexware Office connector, then ask in plain words. The AI picks the tools.

Show me all my customers whose name starts with Acme.
Which invoices are open and not yet paid?
List my articles and services with their prices.
Create a new customer contact for Acme GmbH in Berlin.

What you can do with Lexware Office in Claude and ChatGPT

For small business owners and bookkeepers in Germany who do invoicing with Lexware Office.

Find open and unpaid invoices

The AI searches the voucher list by type and status and reads the open amount of each. It opens an invoice and its payments to see what was paid.

Look up customers and vendors

The AI searches contacts by name or email part and opens one for numbers, addresses, emails, phones and notes.

Read quotations, credit notes, delivery notes and reminders

The AI opens a quotation, credit note, delivery note or dunning (payment reminder) with status and line items, and totals where the document has them.

List articles with prices and posting categories

The AI lists your products and services with price, tax rate and unit, and the bookkeeping posting categories for income or outgo.

Add a customer or vendor, draft an invoice or quotation

The AI creates a customer or vendor contact, then a draft invoice or quotation. Drafts are not finalized or sent, so you check them in Lexware Office first.

Changes data

How do I connect Lexware Office?

Before you connect

The login page asks for your Lexware Office API key.

Create a key in Lexware Office → Erweiterungen → Public API (app.lexware.de/addons/public-api); the Public API needs the XL plan. Give the key all permissions for every tool to work. Your key is used only to call the Lexware API on your behalf; it is never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name Lexware Office and this URL, then click Add:
https://lexware-office.usefulapi.io/mcp
Claude opens the login page: enter your Lexware Office API key.
In a chat, click + → Connectors and turn on Lexware Office.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name Lexware Office and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://lexware-office.usefulapi.io/mcp
ChatGPT opens the login page: enter your Lexware Office API key.
In Plugins, install Lexware Office, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http lexware-office https://lexware-office.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "lexware-office": {
      "url": "https://lexware-office.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "lexware-office": {
      "type": "http",
      "url": "https://lexware-office.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add lexware-office --url https://lexware-office.usefulapi.io/mcp

codex mcp login lexware-office

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://lexware-office.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Lexware Office API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper organization	$9/mo · $90/yr	10,000 tool calls / month
Pro+per organization	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Lexware Office server only. Ask your AI to run lexware_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with lexware_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with lexware_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 25

Show all 25 tools (the AI picks them for you)

Read only · 18

Get the company profilelexware_get_profile
The connected Lexware Office organization: organizationId, company name, the user who created the API key, tax type (net/gross/vatfree), small-business flag (Kleinunternehmer), distance-sales principle and the plan's business features (INVOICING, INVOICING_PRO, BOOKKEEPING). Good first call.
List or search contactslexware_list_contacts
List customers and vendors, optionally filtered (filters combine with AND). name and email match as case-insensitive substrings (at least 3 characters; _ and % are wildcards). Paged: pass next_page as page.
List articleslexware_list_articles
List articles (products and services usable as invoice line items), with price, tax rate and unit. Optional exact filters by article number, GTIN or type. Paged: pass next_page as page.
List vouchers (invoices, quotations, receipts...)lexware_list_vouchers
Search the voucher list: metadata (id, type, status, number, dates, contact, total and open amount) of sales documents (invoice, quotation, creditnote, orderconfirmation, deliverynote, downpaymentinvoice) and bookkeeping vouchers (salesinvoice, salescreditnote, purchaseinvoice, purchasecreditnote). Omit voucher_types / voucher_statuses for all. Then fetch details with the matching get tool (invoice → lexware_get_invoice, quotation → lexware_get_quotation, creditnote → lexware_get_credit_note, orderconfirmation → lexware_get_order_confirmation, deliverynote → lexware_get_delivery_note, downpaymentinvoice → lexware_get_down_payment_invoice, the four bookkeeping types → lexware_get_bookkeeping_voucher). Dates are yyyy-mm-dd, whole days in German time. Up to 10,000 results can be paged through; narrow the dates for more.
Get an invoicelexware_get_invoice
Get one invoice by id: status (draft/open/paid/voided), line items, totals, tax amounts, payment and shipping conditions, related vouchers. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a quotationlexware_get_quotation
Get one quotation by id: status (draft/open/accepted/rejected), expiration date, line items, totals. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a credit notelexware_get_credit_note
Get one credit note by id: status, line items, totals, related invoice. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get an order confirmationlexware_get_order_confirmation
Get one order confirmation by id: status, line items, totals, delivery terms. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a delivery notelexware_get_delivery_note
Get one delivery note by id: status, line items, shipping conditions. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a down payment invoicelexware_get_down_payment_invoice
Get one down payment invoice (Abschlagsrechnung) by id: status, amounts, related closing invoice. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a dunninglexware_get_dunning
Get one dunning (payment reminder) by id: status, the dunned invoice in relatedVouchers, line items, totals. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a bookkeeping voucherlexware_get_bookkeeping_voucher
Get one bookkeeping voucher (salesinvoice, salescreditnote, purchaseinvoice or purchasecreditnote from the voucher list) by id: status, voucher items with posting category ids, tax amounts, contact, file ids. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get an articlelexware_get_article
Get one article (product or service) by id: title, type, article number, GTIN, unit, net/gross price and tax rate.
Get a contactlexware_get_contact
Get one contact (customer and/or vendor) by id: customer/vendor numbers, company or person, contact persons, addresses, emails, phones, note. Includes lexwareAppUrl, a link that opens it in Lexware Office.
Get a voucher's paymentslexware_get_payments
Payment status of an invoice, credit note, down payment invoice or bookkeeping voucher: open amount, payment status (balanced/openRevenue/openExpense), paid date and the payment items (bank transactions, cash, credit notes, Skonto). Not available for quotations or drafts.
List countrieslexware_list_countries
Countries known to Lexware Office with their code, English and German name and tax classification (de, intraCommunity, thirdPartyCountry).
List payment conditionslexware_list_payment_conditions
The payment conditions configured in Lexware Office (days until due, early-payment discount, label template, which is the organization default).
List posting categorieslexware_list_posting_categories
Bookkeeping posting categories (id, name, group, income or outgo, whether a contact is required and split tax rates are allowed), used by bookkeeping vouchers' categoryId. Optionally only income or outgo.

Changes data · 3

Create a contactlexware_create_contact
WRITE: creates a new customer and/or vendor in Lexware Office (Lexware assigns the customer/vendor number). Give company_name for a company OR person_last_name for a private person. One billing and one shipping address, one email and one phone at most. Check lexware_list_contacts first to avoid duplicates.
Create a draft invoicelexware_create_draft_invoice
WRITE: creates an invoice in Lexware Office as a DRAFT (never finalized, numbered or sent; Lexware assigns the number when the user finalizes it in the app). Address it to an existing customer (contact_id) or a one-time address (name + country_code). Prices are EUR. Returns the new id and lexwareAppUrl to review and finalize it in Lexware Office. POST /v1/invoices (without finalize).
Create a draft quotationlexware_create_draft_quotation
WRITE: creates a quotation (Angebot) in Lexware Office as a DRAFT (never finalized or sent). Address it to an existing customer (contact_id) or a one-time address (name + country_code). Prices are EUR. Returns the new id and lexwareAppUrl to review and finalize it in Lexware Office. POST /v1/quotations (without finalize).

Your usefulapi plan · 4

Usage status (free-tier meter)lexware_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featurelexware_request_feature
Tell usefulapi that the user needs something the Lexware Office tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+lexware_upgrade
Get a paid plan for Lexware Office (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptionlexware_cancel_subscription
Cancel the caller's Lexware Office Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run lexware_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Lexware Office in Claude or ChatGPT?

Find open and unpaid invoices. Look up customers and vendors. Read quotations, credit notes, delivery notes and reminders. List articles with prices and posting categories. Add a customer or vendor, draft an invoice or quotation. See what you can do for the details.

Is this an official Lexware Office product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Lexware Office. The server calls the Lexware Office API with your own Lexware Office access, so it sees only the data that your account can see.

Can I connect Lexware Office to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your Lexware Office API key. See Before you connect for where to find it.

Do I put my Lexware Office key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Lexware Office API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my Lexware Office credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Lexware Office API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Lexware Office.

Can the AI change my Lexware Office data?

Yes, if you approve it. 3 of the 21 Lexware Office tools can create or change data. The other 18 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Lexware Office server only. Cancel any time: your paid plan then runs to the end of the paid period. Run lexware_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run lexware_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run lexware_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Lexware Office tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with lexware_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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