# Japan Business Day (remote · japan-business-day-api.matchan962.workers.dev)

Japan business days & holidays (official Cabinet Office data). Free tool + x402 USDC paid tools.

- Trust score: 62/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-29

## Components

- remote · `japan-business-day-api.matchan962.workers.dev`: 62/100 (this document), [markdown](https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api.md), [page](https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api)

## Channel facts

- Endpoint: `https://japan-business-day-api.matchan962.workers.dev/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 2026-09-29.

- **Endpoint Security**: 46/100
  - 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 11 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 enforcement could not be verified: the plaintext port answered with HTTP 406, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1129 tokens (~102/item across 11 items; 11 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 97/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 92% 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 11 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**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Japan Business Day MCP server?

Japan Business Day is a hosted endpoint at https://japan-business-day-api.matchan962.workers.dev/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 rira365-japan-business-day 'https://japan-business-day-api.matchan962.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "rira365-japan-business-day": {
      "url": "https://japan-business-day-api.matchan962.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "rira365-japan-business-day": {
      "type": "http",
      "url": "https://japan-business-day-api.matchan962.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.rira365-japan-business-day]
url = "https://japan-business-day-api.matchan962.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "rira365-japan-business-day": {
      "type": "remote",
      "url": "https://japan-business-day-api.matchan962.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add rira365-japan-business-day --url 'https://japan-business-day-api.matchan962.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  rira365-japan-business-day:
    url: "https://japan-business-day-api.matchan962.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "rira365-japan-business-day": {
      "Transport": "http",
      "Url": "https://japan-business-day-api.matchan962.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add rira365-japan-business-day -t streamable-http -u 'https://japan-business-day-api.matchan962.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "rira365-japan-business-day": {
      "type": "http",
      "url": "https://japan-business-day-api.matchan962.workers.dev/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.

### 2026-09-29 (score 62, +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.

### 2026-09-28 (score 61, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-27 (score 60, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-26 (score 60)

First indexed and scored.

## MCP tools (11)

### `is_business_day_free` (~124 tokens)

FREE: check whether a date between today and 90 days ahead (JST) is a business day in Japan. Official Cabinet Office holiday data, supports bank calendar (Dec 31 - Jan 3). For other dates, business-day arithmetic or holiday lists use the paid tools.

Input parameters:

- `calendar` (string): national (default): weekends + national holidays. bank: also Dec 31 - Jan 3 bank holidays
- `date` (string, required): Date in YYYY-MM-DD. Supported range 1955-01-01..2027-12-31

### `is_business_day` (~110 tokens)

Check whether a date is a business day in Japan (official Cabinet Office holiday data). Returns holiday name (JA/EN) and next/previous business day. Price: $0.005 USDC via x402.

Input parameters:

- `calendar` (string): national (default): weekends + national holidays. bank: also Dec 31 - Jan 3 bank holidays
- `date` (string, required): Date in YYYY-MM-DD. Supported range 1955-01-01..2027-12-31

### `add_business_days` (~105 tokens)

Add or subtract N Japanese business days from a date (settlement T+N, delivery ETA). Price: $0.01 USDC via x402.

Input parameters:

- `calendar` (string): national (default): weekends + national holidays. bank: also Dec 31 - Jan 3 bank holidays
- `date` (string, required): Date in YYYY-MM-DD. Supported range 1955-01-01..2027-12-31
- `days` (integer, required)

### `list_holidays` (~69 tokens)

List Japanese national holidays for a year with JA/EN names. Price: $0.01 USDC via x402.

Input parameters:

- `calendar` (string): national (default): weekends + national holidays. bank: also Dec 31 - Jan 3 bank holidays
- `year` (integer, required)

### `payment_due_date` (~173 tokens)

Japanese payment terms (shimebi/shiharaibi) calculator, e.g. month-end close paid end of next month; shifts to the previous/next business day on weekends/holidays. Price: $0.01 USDC via x402.

Input parameters:

- `adjust` (string): Shift when not a business day; default previous
- `calendar` (string): national (default): weekends + national holidays. bank: also Dec 31 - Jan 3 bank holidays
- `closing` (required): Closing day of month (1-31) or 'end'
- `date` (string, required): Transaction or invoice date (YYYY-MM-DD)
- `monthOffset` (integer): Months after closing; default 1 (next month)
- `payDay` (required): Payment day of month (1-31) or 'end'

### `bank_value_date` (~115 tokens)

When will a Japanese bank transfer be credited? Returns the value date under standard processing (same day before the cutoff, default 15:00 JST, on a bank business day; otherwise next bank business day). Price: $0.01 USDC via x402.

Input parameters:

- `cutoff` (string): Bank cutoff HH:MM JST, default 15:00
- `datetime` (string): Submission time ISO 8601 (default now; no offset = JST)
- `extraDays` (integer): Additional bank business days

### `jpx_trading_day` (~81 tokens)

Is the Tokyo Stock Exchange (JPX) open on a date? Next/previous trading day, first/last trading day of the year. Price: $0.005 USDC via x402.

Input parameters:

- `date` (string, required): Date in YYYY-MM-DD. Supported range 1955-01-01..2027-12-31

### `jpx_record_date` (~74 tokens)

Japanese stocks: last cum-rights trading day and ex-rights date for a dividend/benefit record date (T+2 settlement, holiday-aware). Price: $0.01 USDC via x402.

Input parameters:

- `recordDate` (string, required): Record date (kenri kakutei-bi) YYYY-MM-DD

### `jpx_sq_date` (~59 tokens)

Nikkei 225 futures/options SQ day and last trading day for a contract month (2nd Friday, moved earlier on holidays). Price: $0.01 USDC via x402.

Input parameters:

- `month` (string, required): Contract month YYYY-MM

### `japanese_koyomi` (~73 tokens)

Japanese traditional calendar for a date: rokuyo (taian/butsumetsu lucky days), Reiwa era date, lunisolar date, 24 solar terms. Price: $0.005 USDC via x402.

Input parameters:

- `date` (string, required): YYYY-MM-DD (1955-2032)

### `find_lucky_days_japan` (~146 tokens)

Find auspicious Japanese dates: days in a range matching rokuyo (e.g. taian) and optional weekdays (e.g. sat,sun) for weddings, moving, contracts. Price: $0.01 USDC via x402.

Input parameters:

- `from` (string, required): Start date YYYY-MM-DD
- `rokuyo` (string): Comma-separated: taian,shakko,sensho,tomobiki,sakimake,butsumetsu (default taian)
- `to` (string, required): End date YYYY-MM-DD (max 366 days)
- `weekdays` (string): Comma-separated weekdays, e.g. sat,sun

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api#diagnostics

## Score history

- 2026-09-29: 62
- 2026-09-28: 61
- 2026-09-27: 60
- 2026-09-26: 60

## Common questions

### What is the Japan Business Day MCP server?

Japan Business Day is an MCP server listed in the public MCP registry as io.github.Rira365/japan-business-day. Japan business days & holidays (official Cabinet Office data). Free tool + x402 USDC paid tools. This page covers its hosted endpoint (https://japan-business-day-api.matchan962.workers.dev/mcp).

### Is the Japan Business Day MCP server safe to use?

Japan Business Day scores 62 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 Japan Business Day MCP server expose?

Japan Business Day exposes 11 tools: is_business_day_free, is_business_day, add_business_days, list_holidays, payment_due_date, and 6 more. Their descriptions and schemas cost roughly 1,129 tokens of context every time the server is loaded.

### Does the Japan Business Day MCP server require authentication?

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

### Is the Japan Business Day MCP server still maintained?

Japan Business Day is still listed as active in the MCP registry. We last reached this channel on 29 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://japan-business-day-api.matchan962.workers.dev/mcp
- Changelog RSS feed: https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api.xml
- Changelog JSON feed: https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api.json
- HTML version of this page: https://verifymcp.io/servers/rira365-japan-business-day/japan-business-day-api