# WinkelFactuur (remote · api.winkelfactuur.nl)

Free EU VAT, IBAN and bol.com commission tools for marketplace sellers

- Trust score: 78/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-24

## Components

- remote · `api.winkelfactuur.nl`: 78/100 (this document), [markdown](https://verifymcp.io/servers/nl-winkelfactuur-tools/api.md), [page](https://verifymcp.io/servers/nl-winkelfactuur-tools/api)

## Channel facts

- Endpoint: `https://api.winkelfactuur.nl/mcp`
- Transports: `streamable-http`
- Auth: `none`
- 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 2026-09-24.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 682 tokens (~227/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 87/100
  - Stability observed for 26 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 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the WinkelFactuur MCP server?

WinkelFactuur is a hosted endpoint at https://api.winkelfactuur.nl/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 nl-winkelfactuur-tools 'https://api.winkelfactuur.nl/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "nl-winkelfactuur-tools": {
      "url": "https://api.winkelfactuur.nl/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "nl-winkelfactuur-tools": {
      "type": "http",
      "url": "https://api.winkelfactuur.nl/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.nl-winkelfactuur-tools]
url = "https://api.winkelfactuur.nl/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "nl-winkelfactuur-tools": {
      "type": "remote",
      "url": "https://api.winkelfactuur.nl/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add nl-winkelfactuur-tools --url 'https://api.winkelfactuur.nl/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  nl-winkelfactuur-tools:
    url: "https://api.winkelfactuur.nl/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "nl-winkelfactuur-tools": {
      "Transport": "http",
      "Url": "https://api.winkelfactuur.nl/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add nl-winkelfactuur-tools -t streamable-http -u 'https://api.winkelfactuur.nl/mcp'
```

### Other

```json
{
  "mcpServers": {
    "nl-winkelfactuur-tools": {
      "type": "http",
      "url": "https://api.winkelfactuur.nl/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.

### 2026-09-24 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-22 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-20 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (3)

### `calculate_vat` (~257 tokens)

Calculate Vat Tool

Calculate EU VAT (Dutch: BTW) for a cross-border or domestic sale, using
the destination-country principle that applies to e-commerce.

Handles the cases sellers get wrong: OSS distance selling to another EU
country, B2B reverse charge when the buyer has a VIES-valid VAT number,
and zero-rated exports outside the EU. Rates are the statutory ones for
the destination country, including reduced rates when a category is given.

Input parameters:

- `amount` (number, required): Net amount (excluding VAT) in euros.
- `category` (string): Optional product category, used to find a reduced rate (books, food, medicine and similar).
- `customer_country` (string, required): Two-letter country code the goods are shipped to, e.g. NL, DE, FR. This is what determines the rate.
- `customer_vat_number` (string): Buyer VAT number. Required for B2B reverse charge; it is checked against VIES, so an invented number will not zero the VAT.
- `is_business` (boolean): True when the buyer is a business (B2B). Reverse charge also needs a valid VAT number.
- `seller_country` (string): Two-letter country code the seller is established in. Defaults to NL.

### `validate_iban` (~100 tokens)

Validate Iban Tool

Validate an IBAN (bank account number) and report whether its check
digits and country-specific length are correct.

Catches transposed or missing digits before a payment or an invoice goes
out with the wrong account number. This checks the number's structure,
not whether the account exists or who owns it.

Input parameters:

- `iban` (string, required): The IBAN to check. Spaces, dots and dashes are ignored, so it can be pasted as printed.

### `bol_commission` (~206 tokens)

Bol Commission Tool

Work out what bol.com keeps from a sale: the commission percentage for
the product category, any fixed fee, and what the seller is left with.

Category names are the Dutch ones bol.com uses ("Elektronica", "Boeken",
"Speelgoed"). If the category is unknown or missing, the tool returns the
list of categories it knows, so call it again with one of those.

Input parameters:

- `category` (string, required): bol.com main category, in Dutch. For example: Elektronica, Boeken, Speelgoed, Wonen & Koken.
- `fulfilment_type` (string): lvb for Logistiek via bol, fbr when the seller ships. Leave out if it does not matter.
- `price` (number, required): Selling price in euros, including VAT, as shown to the buyer.
- `subcategory` (string): Subcategory when the main one splits by rate, e.g. Telefoons or Televisies under Elektronica.

## Diagnostics

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

## Score history

- 2026-09-24: 78
- 2026-09-23: 77
- 2026-09-22: 77
- 2026-09-21: 76
- 2026-09-20: 76
- 2026-09-19: 75
- 2026-09-18: 75
- 2026-09-17: 74
- 2026-09-16: 74
- 2026-09-15: 74
- 2026-09-14: 73
- 2026-09-13: 73
- 2026-09-12: 72
- 2026-09-11: 72
- 2026-09-10: 71
- 2026-09-09: 71
- 2026-09-08: 70
- 2026-09-07: 70
- 2026-09-06: 69
- 2026-09-05: 69
- 2026-09-04: 68
- 2026-09-03: 68
- 2026-09-02: 67
- 2026-09-01: 67
- 2026-08-31: 67
- 2026-08-30: 66
- 2026-08-29: 66

## Common questions

### What is the WinkelFactuur MCP server?

WinkelFactuur is an MCP server listed in the public MCP registry as nl.winkelfactuur/tools. Free EU VAT, IBAN and bol.com commission tools for marketplace sellers. This page covers its hosted endpoint (https://api.winkelfactuur.nl/mcp).

### Is the WinkelFactuur MCP server safe to use?

WinkelFactuur scores 78 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 WinkelFactuur MCP server expose?

WinkelFactuur exposes 3 tools: calculate_vat, validate_iban, bol_commission. Their descriptions and schemas cost roughly 563 tokens of context every time the server is loaded.

### Does the WinkelFactuur MCP server require authentication?

No. We connected to WinkelFactuur without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the WinkelFactuur MCP server still maintained?

WinkelFactuur is still listed as active in the MCP registry. We last reached this channel on 24 September 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://api.winkelfactuur.nl/mcp
- Website: https://winkelfactuur.nl/
- Changelog RSS feed: https://verifymcp.io/servers/nl-winkelfactuur-tools/api.xml
- Changelog JSON feed: https://verifymcp.io/servers/nl-winkelfactuur-tools/api.json
- HTML version of this page: https://verifymcp.io/servers/nl-winkelfactuur-tools/api