Vyfakturuj MCP server

Read and create Vyfakturuj invoices and contacts: search, number series, payment methods, tags. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Vyfakturuj50 free tool calls a month

What can I ask?

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

Show my ten newest invoices with customer and total.
Find the contact details for customer Acme Ltd in my address book.
Which payment methods and number series do I have set up?
Add a new contact for Acme Ltd with email billing@acme.com.

What you can do with Vyfakturuj in Claude and ChatGPT

For Czech and Slovak freelancers and small businesses who issue invoices with Vyfakturuj.

Review the newest invoices and their totals

The AI lists documents sorted newest first, with number, customer, currency, total and paid or sent flags, and opens one invoice with its items.

Find a customer in the address book

The AI searches contacts by text, ICO, DIC, name, e-mail or phone and reads one contact with billing and delivery address and default days due.

Check payment methods, number series and tags

The AI lists the payment methods, the numbering series and the tags set up in the account, with their ids.

Add a customer to the address book

The AI creates a contact with a name or company and details such as e-mail. Nothing is sent to the customer.

Changes data

Issue an invoice for a customer

The AI creates an invoice with items for a contact, using a number series and payment method. It is issued at once with the next number, as there is no draft state.

Changes data

How do I connect Vyfakturuj?

Before you connect

The login page asks for your Vyfakturuj login e-mail and Vyfakturuj API key.

Create the key in Vyfakturuj under Nastavení → Propojení s dalšími systémy → API a webhook (app.vyfakturuj.cz/nastaveni/propojeni/api). Use the API key, not your account password. The API is part of the Ideal and Profi plans, and every call counts against your plan's monthly API request limit. Your key is used only to call the Vyfakturuj 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 Vyfakturuj and this URL, then click Add:
https://vyfakturuj.usefulapi.io/mcp
Claude opens the login page: enter your Vyfakturuj login e-mail and Vyfakturuj API key.
In a chat, click + → Connectors and turn on Vyfakturuj.

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 Vyfakturuj and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://vyfakturuj.usefulapi.io/mcp
ChatGPT opens the login page: enter your Vyfakturuj login e-mail and Vyfakturuj API key.
In Plugins, install Vyfakturuj, 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 vyfakturuj https://vyfakturuj.usefulapi.io/mcp

Cursor

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

{
  "mcpServers": {
    "vyfakturuj": {
      "url": "https://vyfakturuj.usefulapi.io/mcp"
    }
  }
}

VS Code

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

{
  "servers": {
    "vyfakturuj": {
      "type": "http",
      "url": "https://vyfakturuj.usefulapi.io/mcp"
    }
  }
}

Codex

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

codex mcp add vyfakturuj --url https://vyfakturuj.usefulapi.io/mcp

codex mcp login vyfakturuj

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://vyfakturuj.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 Vyfakturuj login e-mail and Vyfakturuj 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 user	$9/mo · $90/yr	10,000 tool calls / month
Pro+per user	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Vyfakturuj server only. Ask your AI to run vyfakturuj_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 vyfakturuj_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 vyfakturuj_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 14

Show all 14 tools (the AI picks them for you)

Read only · 8

List invoicesvyfakturuj_list_invoices
Search documents (faktury, zalohove faktury, proformy, objednavky ...); pass sort=date_created~desc for the newest first. Each row has id, number, type, dates, customer, VS, currency, total, flags and flags_decoded (paid, sent_to_customer, cancelled, ...) and the public/PDF URLs; use vyfakturuj_get_invoice for the whole document with items. Filter by free text q, customer id, document type, number, variable symbol (VS), currency or creation date range. Paged with rows_limit/rows_offset.
Get an invoicevyfakturuj_get_invoice
One document with all fields: supplier and customer blocks, items (text, quantity, unit_price, vat_rate, totals), dates, VS, bank details, total, flags and flags_decoded, payment method, public page, PDF and online-payment URLs.
List contactsvyfakturuj_list_contacts
Search the address book (adresar): id, name, company, ICO (IC), DIC, address, e-mail (mail_to), phone, default days_due. Filter by free text q, ICO, DIC, name, e-mail or phone. Paged with rows_limit/rows_offset.
Get a contactvyfakturuj_get_contact
One address-book contact with every field (billing and delivery address, ICO/DIC, e-mails, default texts and days_due).
Get a recurring-invoice templatevyfakturuj_get_template
One template / recurring invoice (sablona, pravidelna faktura) by id: its items, customer, schedule and settings. The API has no list endpoint for templates, so the id comes from the user (the number in the template's URL in Vyfakturuj).
List payment methodsvyfakturuj_list_payment_methods
The payment methods of the account (id_payment_method, name, type: 1 bank transfer, 2 cash, 4 cash on delivery, 8 card, ...). Use the id in vyfakturuj_create_invoice.
List number seriesvyfakturuj_list_number_series
The numbering series (ciselne rady) of the account: id_number_series, the document type it is for, name and the number pattern. Use the id in vyfakturuj_create_invoice.
List tagsvyfakturuj_list_tags
The tags (stitky) of the account: id_tag, name and colour. Invoices carry an id_tag.

Changes data · 2

Create an invoice (issues a real numbered document)vyfakturuj_create_invoice
WRITE. Creates a document in Vyfakturuj. Vyfakturuj has NO draft state: the document is issued at once and takes the next number of its number series (delete or cancel it in Vyfakturuj if wrong). Does NOT send an e-mail to the customer, does NOT mark it paid and moves no money; automatic reminders and paid notices are switched off for it (disable_automated_mails). Name the customer with id_customer (an address-book contact, from vyfakturuj_list_contacts) or with the customer_* fields. Items need text and unit_price. Optional id_number_series / id_payment_method come from vyfakturuj_list_number_series / vyfakturuj_list_payment_methods; the account defaults apply otherwise. Prices are net unless calculate_vat is 2 (gross).
Create a contactvyfakturuj_create_contact
WRITE. Adds a contact to the address book (it is not a customer message: nothing is sent). Give at least a name (the address-book label) or company or last name. Returns the new contact with its id.

Your usefulapi plan · 4

Usage status (free-tier meter)vyfakturuj_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 featurevyfakturuj_request_feature
Tell usefulapi that the user needs something the Vyfakturuj 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+vyfakturuj_upgrade
Get a paid plan for Vyfakturuj (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 subscriptionvyfakturuj_cancel_subscription
Cancel the caller's Vyfakturuj 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 vyfakturuj_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Vyfakturuj in Claude or ChatGPT?

Review the newest invoices and their totals. Find a customer in the address book. Check payment methods, number series and tags. Add a customer to the address book. Issue an invoice for a customer. See what you can do for the details.

Is this an official Vyfakturuj product?

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

Can I connect Vyfakturuj 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 Vyfakturuj login e-mail and Vyfakturuj API key. See Before you connect for where to find them.

Do I put my Vyfakturuj 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 Vyfakturuj login e-mail and Vyfakturuj 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 Vyfakturuj credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Vyfakturuj 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 Vyfakturuj.

Can the AI change my Vyfakturuj data?

Yes, if you approve it. 2 of the 10 Vyfakturuj tools can create or change data. The other 8 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 Vyfakturuj server only. Cancel any time: your paid plan then runs to the end of the paid period. Run vyfakturuj_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run vyfakturuj_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 vyfakturuj_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Vyfakturuj tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with vyfakturuj_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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