Read Billomat clients, invoices, offers, credit notes, reminders; create clients and draft invoices. Hosted by usefulapi — connect from Claude, 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": {
"billomat": {
"url": "https://billomat.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"billomat": {
"type": "http",
"url": "https://billomat.usefulapi.io/mcp"
}
}
}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 Billomat id and Billomat API key.
The Billomat id is the first part of your Billomat address (https://yourcompany.billomat.net). Create the key in Billomat → Einstellungen → Mitarbeiter → your user (enable API access, then generate the API key). The key acts with that user's rights; a dedicated user makes its activity easy to track. Your key is used only to call the Billomat 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 Billomat id and Billomat 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.
| Tool | Type | What it does |
|---|---|---|
billomat_get_current_user | read | Get the current user Show the Billomat user the API key belongs to (name, email, role and rights). Use it to check which rights the key has. |
billomat_get_company | read | Get the own company data Show the own company data of the Billomat account (name, address, bank details, tax numbers, currency). |
billomat_list_clients | read | List or search clients List the clients (customers) of the account, filtered by name, number, email, contact person, country, note or tags. Paged. |
billomat_get_client | read | Get a client Get one client with address, contact person, bank details, payment terms and revenue. |
billomat_list_articles | read | List articles List the articles (products and services) with prices, units and tax. Paged. |
billomat_get_article | read | Get an article Get one article with its prices, unit, tax and supplier. |
billomat_list_suppliers | read | List suppliers List the suppliers of the account, filtered by name, email, contact person, country, note or tags. Paged. |
billomat_get_supplier | read | Get a supplier Get one supplier with address and bank details. |
billomat_list_invoices | read | List invoices List invoices (Rechnungen), filtered by client, status (DRAFT, OPEN, PAID, OVERDUE, CANCELED), number, date range, text or tags. Paged; each invoice carries totals and the open amount. |
billomat_invoice_totals | read | Invoice totals by group Invoice totals grouped by client, status, day, week, month or year (for example group_by=client,year). Takes the same filters as billomat_list_invoices. Read-only. |
billomat_get_invoice | read | Get an invoice Get one invoice (status, totals, dates, client, payment terms). Its line items come from billomat_list_invoice_items. |
billomat_list_invoice_items | read | List the items of an invoice List the line items (positions) of one invoice. |
billomat_list_invoice_payments | read | List invoice payments List the payments that were recorded on invoices (read-only), optionally for one invoice, a date range or payment types. |
billomat_list_recurring_invoices | read | List recurring invoices List recurring invoices (Abo-Rechnungen): name, cycle (DAILY, WEEKLY, MONTHLY, YEARLY), client and next run. Paged. |
billomat_list_offers | read | List offers List offers (Angebote), filtered by client, status (DRAFT, OPEN, WON, LOST, CANCELED, CLEARED), number, date range or text. Paged. |
billomat_get_offer | read | Get an offer Get one offer (status, totals, validity, client). |
billomat_list_confirmations | read | List order confirmations List order confirmations (Auftragsbestaetigungen), filtered by client, status (DRAFT, COMPLETED, CANCELED, CLEARED), number, date range or text. Paged. |
billomat_get_confirmation | read | Get an order confirmation Get one order confirmation. |
billomat_list_delivery_notes | read | List delivery notes List delivery notes (Lieferscheine), filtered by client, status (DRAFT, CREATED), number, date range or text. Paged. |
billomat_get_delivery_note | read | Get a delivery note Get one delivery note. |
billomat_list_credit_notes | read | List credit notes List credit notes (Gutschriften), filtered by client, status (DRAFT, OPEN, PAID), date range or text. Paged. |
billomat_get_credit_note | read | Get a credit note Get one credit note. |
billomat_list_reminders | read | List reminders List payment reminders (Mahnungen), filtered by client, status (DRAFT, OPEN, OVERDUE, PAID, CANCELED), invoice number, date range or text. Paged. |
billomat_get_reminder | read | Get a reminder Get one payment reminder. |
billomat_list_incoming_invoices | read | List incoming invoices List incoming invoices (Eingangsrechnungen, from suppliers), filtered by supplier, status (OPEN, PAID, OVERDUE), number, date range, note or tags. Paged. |
billomat_get_incoming_invoice | read | Get an incoming invoice Get one incoming invoice with amounts and open amount. |
billomat_list_taxes | read | List tax rates List the tax rates (Steuersaetze) of the account, with the default one. |
billomat_list_units | read | List units List the units (Einheiten) used for article and item quantities, optionally filtered by name. |
billomat_create_client | write | Create a client WRITE: create a new client (customer) in Billomat. Billomat assigns the client number. Nothing is sent to the client. Check billomat_list_clients first to avoid duplicates. |
billomat_update_client | write | Update a client WRITE: change fields of an existing client (only the fields you pass are changed; everything else stays). Read the client first with billomat_get_client. Nothing is sent to the client. |
billomat_create_article | write | Create an article WRITE: create a new article (product or service) with a price. Billomat assigns the article number. |
billomat_create_draft_invoice | write | Create a draft invoice WRITE: create an invoice as a DRAFT (Entwurf) for a client, with optional line items. The invoice is NOT completed, has no number yet and is NOT sent; review and complete it in Billomat. Nothing is charged. |
billomat_add_invoice_item | write | Add an item to a draft invoice WRITE: add one line item to an invoice that is still a DRAFT (Billomat refuses it for any other status). Does not complete or send the invoice. |
billomat_create_draft_offer | write | Create a draft offer WRITE: create an offer (Angebot) as a DRAFT for a client, with optional line items. The offer is NOT completed, has no number yet and is NOT sent; review and complete it in Billomat. |
billomat_usage_status | Usage status (free-tier meter) Report the caller's current free-tier usage this month: calls used, monthly limit, remaining, and whether the cap is reached. Read-only; does not count against the meter. | |
billomat_request_feature | Request a missing feature Tell usefulapi that the user needs something the Billomat 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. | |
billomat_upgrade | Upgrade to Pro (unlimited) Subscribe to the Pro plan for UNLIMITED Billomat tool calls (the free tier caps monthly usage). Choose monthly ($9/month) or yearly ($90/year — 2 months free) billing. Returns a Stripe Checkout link to open in your browser; after payment your account upgrades automatically. Does not count against the meter. | |
billomat_cancel_subscription | Cancel the Pro subscription Cancel the caller's Billomat Pro subscription at the end of the paid period (no refund for the current period; unlimited calls continue until then, then the free tier applies). Requires confirm: true. Run billomat_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 100 tool calls / month |
| Proper account | $9/mo · $90/yr | Unlimited |
Pro covers this Billomat server only. Subscribe with billomat_upgrade (it returns a Stripe Checkout link). Cancel any time with billomat_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running billomat_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 Billomat. The server calls the Billomat API with your own Billomat access, so it sees only the data that your account can see.
The login page asks for your Billomat id and Billomat API key. See Before you connect for where to find them.
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 Billomat id and Billomat 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 Billomat 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 Billomat.
Yes, if you approve it. 6 of the 34 Billomat tools can create or change data. The other 28 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 100 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls, for this Billomat server only. Run billomat_usage_status to see how many calls you used.
Ask the AI to run billomat_upgrade: it returns a Stripe Checkout link. To cancel, run billomat_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 billomat_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, 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.