Vyfakturuj MCP
Search, create and manage invoices and contacts in Vyfakturuj accounting software.
Connects to Vyfakturuj invoicing platform. Muse can search and retrieve invoices and contacts, create new invoices and contacts, and access payment methods and numbering series. Requires a Vyfakturuj account.
Try asking Muse: "Create an invoice for a customer in my address book with three line items and send it to them."
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Source: Found in the official MCP Registry (io.usefulapi/vyfakturuj) · First listed October 29, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 1 h ago.
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.
musedirectory.ai is not part of Meta. More about how Muse handles your information
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://vyfakturuj.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
Vyfakturuj MCP 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://vyfakturuj.usefulapi.io/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 3208ms. 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 · 10
vyfakturuj_list_invoicesSearch 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;vyfakturuj_get_invoiceOne 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. GET /invoice/{id}/.vyfakturuj_create_invoiceWRITE. 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; avyfakturuj_list_contactsSearch 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 /contact/.vyfakturuj_get_contactOne address-book contact with every field (billing and delivery address, ICO/DIC, e-mails, default texts and days_due). GET /contact/{id}/.vyfakturuj_create_contactWRITE. 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. POST /contact/.vyfakturuj_get_templateOne 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). GET /template/{id}/.vyfakturuj_list_payment_methodsThe 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. GET /settings/payment-method/.vyfakturuj_list_number_seriesThe 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. GET /settings/number-series/.vyfakturuj_list_tagsThe tags (stitky) of the account: id_tag, name and colour. Invoices carry an id_tag. GET /settings/tags/.Recent checks
Link
https://vyfakturuj.usefulapi.io/mcpQuestions about Vyfakturuj MCP in Muse
How do I connect Vyfakturuj MCP to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Vyfakturuj MCP to help me. It is a free service with an MCP server at https://vyfakturuj.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 Vyfakturuj MCP working right now?
At the last check (October 29, 2026, 10:45 UTC) the endpoint was working, answering in 3208ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Vyfakturuj MCP 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 Vyfakturuj MCP do in Muse?
It exposes 10 tools, including vyfakturuj_list_invoices, vyfakturuj_get_invoice, vyfakturuj_create_invoice, vyfakturuj_list_contacts. For example, you could ask Muse: "Create an invoice for a customer in my address book with three line items and send it to them."
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