Read Lexware Office contacts, articles, invoices and vouchers; create contacts and draft invoices. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"lexware-office": {
"url": "https://lexware-office.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"lexware-office": {
"type": "http",
"url": "https://lexware-office.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see 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.
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.
Turn on the Lexware Office connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
lexware_get_profile | read | Get the company 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. GET /v1/profile. |
lexware_list_contacts | read | List or search 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. GET /v1/contacts. |
lexware_list_articles | read | 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. GET /v1/articles. |
lexware_list_vouchers | read | List vouchers (invoices, quotations, receipts...) 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 /v1/voucherlist. |
lexware_get_invoice | read | Get an 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 /v1/invoices/{id}. |
lexware_get_quotation | read | Get a 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 /v1/quotations/{id}. |
lexware_get_credit_note | read | Get a 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 /v1/credit-notes/{id}. |
lexware_get_order_confirmation | read | Get an 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 /v1/order-confirmations/{id}. |
lexware_get_delivery_note | read | Get a delivery note Get one delivery note by id: status, line items, shipping conditions. Includes lexwareAppUrl, a link that opens it in Lexware Office. GET /v1/delivery-notes/{id}. |
lexware_get_down_payment_invoice | read | Get a 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 /v1/down-payment-invoices/{id}. |
lexware_get_dunning | read | Get a 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 /v1/dunnings/{id}. |
lexware_get_bookkeeping_voucher | read | Get a 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 /v1/vouchers/{id}. |
lexware_get_article | read | Get an article Get one article (product or service) by id: title, type, article number, GTIN, unit, net/gross price and tax rate. GET /v1/articles/{id}. |
lexware_get_contact | read | Get a 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 /v1/contacts/{id}. |
lexware_get_payments | read | Get a voucher's 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. GET /v1/payments/{voucherId}. |
lexware_list_countries | read | List countries Countries known to Lexware Office with their code, English and German name and tax classification (de, intraCommunity, thirdPartyCountry). GET /v1/countries. |
lexware_list_payment_conditions | read | List payment conditions The payment conditions configured in Lexware Office (days until due, early-payment discount, label template, which is the organization default). GET /v1/payment-conditions. |
lexware_list_posting_categories | read | 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. GET /v1/posting-categories. |
lexware_create_contact | write | Create a 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. POST /v1/contacts. |
lexware_create_draft_invoice | write | Create a 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). |
lexware_create_draft_quotation | write | Create a 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). |
lexware_usage_status | Usage status (free-tier meter) 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. | |
lexware_request_feature | Request a missing 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. | |
lexware_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on Lexware Office (the free tier caps monthly usage). Plans: "monthly" — $9/month; "yearly" — $90/year (2 months free). Cancel any time: Pro then runs to the end of the paid period, so it also suits a one-time job. *A fair use limit applies. For heavy use (near Pro's limit): "plus" or "plus_yearly" — Pro+, $19/month or $190/year, unlimited tool calls (fair use limit: 100,000 a month); an existing Pro subscription changes to Pro+ in place (needs confirm: true; the price difference for the rest of the period is charged at once). Otherwise returns a short link to open in your browser (it opens Stripe Checkout); after payment the account upgrades automatically. Does not count against the meter. | |
lexware_cancel_subscription | Cancel the Pro 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. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper organization | $9/mo · $90/yr | Unlimited* |
*Pro fair use limit: 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this Lexware Office server only. Subscribe with lexware_upgrade (it returns a Stripe Checkout link). Cancel any time with lexware_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running lexware_upgrade before then undoes the cancel. Or write to [email protected].
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.
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.
The login page asks for your Lexware Office API key. See Before you connect for where to find it.
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.
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.
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.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls (fair use limit: 10,000 tool calls a month), for this Lexware Office server only. Cancel any time: Pro then runs to the end of the paid period. Run lexware_usage_status to see how many calls you used.
Ask the AI to run lexware_upgrade: it returns a Stripe Checkout link. To cancel, run lexware_cancel_subscription. Pro continues to the end of the paid period.
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.
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.