Lexware Office
Read and create invoices, contacts, quotations and financial documents in Lexware Office accounting software.
Connects to Lexware Office, German accounting and invoicing software. Muse can read invoices, quotations, credit notes, contacts, articles and payment status; create new contacts and draft invoices for review before finalization.
Try asking Muse: "Show me all unpaid invoices from the last month and create a draft invoice for a new customer."
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Source: Found in the official MCP Registry (io.usefulapi/lexware-office) · First listed October 29, 2026
Last 24 hours
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Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://lexware-office.usefulapi.io/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Lexware Office is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://lexware-office.usefulapi.io/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1768ms. Worked in 100% of checks over 30 days.
Screening · October 29, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 21
lexware_get_profileThe 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). Goodlexware_list_contactsList 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_articlesList 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_vouchersSearch 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, plexware_get_invoiceGet 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_quotationGet 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_noteGet 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_confirmationGet 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_noteGet 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_invoiceGet 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_dunningGet 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_voucherGet 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 /v1lexware_get_articleGet 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_contactGet 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_paymentsPayment 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 /v1lexware_list_countriesCountries known to Lexware Office with their code, English and German name and tax classification (de, intraCommunity, thirdPartyCountry). GET /v1/countries.lexware_list_payment_conditionsThe 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_categoriesBookkeeping 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_contactWRITE: 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_contactslexware_create_draft_invoiceWRITE: 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 nlexware_create_draft_quotationWRITE: 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 OffiRecent checks
Link
https://lexware-office.usefulapi.io/mcpQuestions about Lexware Office in Muse
How do I connect Lexware Office to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Lexware Office to help me. It is a free service with an MCP server at https://lexware-office.usefulapi.io/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Lexware Office working right now?
At the last check (October 29, 2026, 10:31 UTC) the endpoint was working, answering in 1768ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Lexware Office safe to connect to Muse?
It was screened on October 29, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Lexware Office do in Muse?
It exposes 21 tools, including lexware_get_profile, lexware_list_contacts, lexware_list_articles, lexware_list_vouchers. For example, you could ask Muse: "Show me all unpaid invoices from the last month and create a draft invoice for a new customer."
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