# Vyfakturuj MCP by usefulapi (remote · vyfakturuj.usefulapi.io)

Read and create Vyfakturuj invoices and contacts: search, number series, payment methods, tags.

- Trust score: 64/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `vyfakturuj.usefulapi.io`: 64/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj.md), [page](https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj)

## Channel facts

- Endpoint: `https://vyfakturuj.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 76/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 2110 tokens (~211/item across 10 items; 10 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Vyfakturuj MCP by usefulapi server?

Vyfakturuj MCP by usefulapi is a hosted endpoint at https://vyfakturuj.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-vyfakturuj 'https://vyfakturuj.usefulapi.io/mcp'
```

### Cursor

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

### VS Code

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

### Codex

```toml
[mcp_servers.io-usefulapi-vyfakturuj]
url = "https://vyfakturuj.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-vyfakturuj": {
      "type": "remote",
      "url": "https://vyfakturuj.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-vyfakturuj --url 'https://vyfakturuj.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-vyfakturuj:
    url: "https://vyfakturuj.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-vyfakturuj": {
      "Transport": "http",
      "Url": "https://vyfakturuj.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-vyfakturuj -t streamable-http -u 'https://vyfakturuj.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-vyfakturuj": {
      "type": "http",
      "url": "https://vyfakturuj.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-17 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-14 (score 62, +3)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional] The server now declares the “prompts” capability
- [functional] First check of Schema quality: 100
- [functional] New prompt “getting_started”
- [functional] Server version: 1.0.0 → 1.1.0

### 2026-10-13 (score 59, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 59)

First indexed and scored.

## MCP tools (10)

### `vyfakturuj_list_invoices` (~402 tokens)

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 /invoice/.

Input parameters:

- `VS` (string): Variable symbol (variabilni symbol).
- `currency` (string): Currency, ISO 4217, e.g. CZK, EUR.
- `date_created_from` (string): Created on or after this date (yyyy-mm-dd).
- `date_created_to` (string): Created on or before this date (yyyy-mm-dd).
- `id_customer`: Only invoices of this address-book contact (from vyfakturuj_list_contacts).
- `number` (string): Exact document number.
- `q` (string): Free-text search over the invoices.
- `rows_limit` (integer): Rows to return, 1-100 (default 25).
- `rows_offset` (integer): Rows to skip (default 0). Use next_offset from the previous reply.
- `sort` (string): Sort: column~asc or column~desc, several joined by | (for example date_created~desc|number~asc).
- `type`: Document type: 1 faktura, 2 zalohova faktura, 4 proforma, 8 vyzva k platbe, 16 danovy doklad, 32 opravny danovy doklad, 64 prijmovy doklad, 128 opravny doklad, 512 objednavka.

### `vyfakturuj_get_invoice` (~88 tokens)

Get an 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. GET /invoice/{id}/.

Input parameters:

- `id` (required): The invoice id (from vyfakturuj_list_invoices).

### `vyfakturuj_create_invoice` (~629 tokens)

Create an invoice (issues a real numbered document)

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). POST /invoice/.

Input parameters:

- `VS` (integer): Variable symbol (default: derived from the number).
- `calculate_vat`: 1 items are net (VAT added), 2 items are gross, 3 special VAT regime, 4 domestic reverse charge, 5 not a VAT payer, 6 foreign reverse charge.
- `currency` (string): Currency, ISO 4217 (default: the account's).
- `customer_DIC` (string): Customer DIC (VAT id).
- `customer_IC` (string): Customer ICO (company id).
- `customer_city` (string): Customer city.
- `customer_country_code` (string): ISO 3166 country code, e.g. CZ, SK, DE.
- `customer_firstname` (string): Customer first name.
- `customer_lastname` (string): Customer last name.
- `customer_name` (string): Customer company name (when no id_customer).
- `customer_street` (string): Customer street.
- `customer_zip` (string): Customer postal code (PSC).
- `date_created` (string): Issue date yyyy-mm-dd (default today).
- `date_taxable_supply` (string): Date of taxable supply (DUZP) yyyy-mm-dd.
- `days_due` (integer): Days until due (splatnost).
- `id_customer`: Address-book contact id (from vyfakturuj_list_contacts); fills the customer block.
- `id_number_series`: Number series id (from vyfakturuj_list_number_series); must match the document type.
- `id_payment_method`: Payment method id (from vyfakturuj_list_payment_methods).
- `items` (array, required): Document items (1-200).
- `language` (string): Language of the document.
- `note_internal` (string): Internal note (not on the document).
- `order_number` (string): Order id / reference.
- `text_before_items` (string): Text before the items.
- `text_invoice_footer` (string): Text in the footer.
- `type`: Document type: 1 faktura (default), 2 zalohova faktura, 4 proforma faktura, 8 vyzva k platbe, 512 objednavka.

### `vyfakturuj_list_contacts` (~222 tokens)

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 /contact/.

Input parameters:

- `DIC` (string): Exact DIC (VAT id).
- `IC` (string): Exact ICO (company id).
- `mail_to` (string): E-mail address of the contact.
- `name` (string): Address-book name.
- `q` (string): Free-text search.
- `rows_limit` (integer): Rows to return, 1-100 (default 25).
- `rows_offset` (integer): Rows to skip (default 0). Use next_offset from the previous reply.
- `sort` (string): Sort: column~asc or column~desc, several joined by | (for example date_created~desc|number~asc).
- `tel` (string): Phone number.

### `vyfakturuj_get_contact` (~61 tokens)

Get a contact

One address-book contact with every field (billing and delivery address, ICO/DIC, e-mails, default texts and days_due). GET /contact/{id}/.

Input parameters:

- `id` (required): The contact id (from vyfakturuj_list_contacts).

### `vyfakturuj_create_contact` (~236 tokens)

Create a 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. POST /contact/.

Input parameters:

- `DIC` (string): DIC (VAT id).
- `IC` (string): ICO (company id).
- `city` (string): City.
- `company` (string): Company name.
- `country_code` (string): ISO 3166 country code, e.g. CZ, SK, DE.
- `days_due` (integer): Default days until due for this contact.
- `firstname` (string): First name.
- `lastname` (string): Last name.
- `mail_to` (string): E-mail where invoices and reminders go.
- `name` (string): Address-book name (how it is listed).
- `note` (string): Your note about the contact.
- `street` (string): Street.
- `tel` (string): Phone.
- `web` (string): Web.
- `zip` (string): Postal code (PSC).

### `vyfakturuj_get_template` (~85 tokens)

Get a recurring-invoice 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). GET /template/{id}/.

Input parameters:

- `id` (required): The template id.

### `vyfakturuj_list_payment_methods` (~66 tokens)

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. GET /settings/payment-method/.

### `vyfakturuj_list_number_series` (~61 tokens)

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. GET /settings/number-series/.

### `vyfakturuj_list_tags` (~42 tokens)

List tags

The tags (stitky) of the account: id_tag, name and colour. Invoices carry an id_tag. GET /settings/tags/.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj#diagnostics

## Score history

- 2026-10-18: 64
- 2026-10-17: 64
- 2026-10-16: 63
- 2026-10-15: 63
- 2026-10-14: 62
- 2026-10-13: 59
- 2026-10-12: 59

## Common questions

### What is the Vyfakturuj MCP by usefulapi server?

Vyfakturuj MCP by usefulapi is listed in the public MCP registry as io.usefulapi/vyfakturuj. Read and create Vyfakturuj invoices and contacts: search, number series, payment methods, tags. This page covers its hosted endpoint (https://vyfakturuj.usefulapi.io/mcp).

### Is the Vyfakturuj MCP by usefulapi server safe to use?

Vyfakturuj MCP by usefulapi scores 64 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Vyfakturuj MCP by usefulapi server expose?

Vyfakturuj MCP by usefulapi exposes 10 tools: vyfakturuj_list_invoices, vyfakturuj_get_invoice, vyfakturuj_create_invoice, vyfakturuj_list_contacts, vyfakturuj_get_contact, and 5 more. Their descriptions and schemas cost roughly 1,892 tokens of context every time the server is loaded.

### Does the Vyfakturuj MCP by usefulapi server require authentication?

Yes. Vyfakturuj MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Vyfakturuj MCP by usefulapi server still maintained?

Vyfakturuj MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://vyfakturuj.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/vyfakturuj/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-vyfakturuj/vyfakturuj