# Checksum Validator (remote · apished.com)

Validates Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT checksums and formats.

- Trust score: 66/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-20

## Components

- remote · `apished.com`: 66/100 (this document), [markdown](https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum.md), [page](https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum)

## Channel facts

- Endpoint: `https://apished.com/mcp/v1/checksum`
- 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 2026-08-20.

- **Endpoint Security**: 60/100
  - 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 6 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.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 80/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 436 tokens (~72/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-apished-checksum-validator https://apished.com/mcp/v1/checksum
```

### Codex

```toml
[mcp_servers.com-apished-checksum-validator]
url = "https://apished.com/mcp/v1/checksum"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-apished-checksum-validator": {
      "type": "remote",
      "url": "https://apished.com/mcp/v1/checksum",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-apished-checksum-validator --url https://apished.com/mcp/v1/checksum --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-apished-checksum-validator:
    url: "https://apished.com/mcp/v1/checksum"
```

### Other

```json
{
  "mcpServers": {
    "com-apished-checksum-validator": {
      "type": "http",
      "url": "https://apished.com/mcp/v1/checksum"
    }
  }
}
```

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.

### 2026-08-20 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-19 (score 65, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-18 (score 65)

First indexed and scored.

## MCP tools (6)

### `ean_validate` (~86 tokens)

Validates an 8-digit (EAN-8), 12-digit (UPC-A), 13-digit (EAN-13), or 14-digit (GTIN-14) barcode checksum: alternating weights 1 3 applied right-to-left, check digit is (10 - sum mod 10) mod 10.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

### `iban_validate` (~66 tokens)

Validates an IBAN's length for its issuing country (per the SWIFT IBAN registry) and its mod-97 checksum. Does not decompose the BBAN into a bank code/account number or resolve a BIC.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

### `isbn_validate` (~77 tokens)

Validates a 10- or 13-character ISBN. ISBN-10 uses weights 10..1 over 10 characters (last may be X, worth 10), sum mod 11 must be 0. ISBN-13 uses the same GTIN checksum as barcodes.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

### `luhn_validate` (~49 tokens)

Validates a numeric string against the Luhn (mod-10) checksum — payment card numbers, IMEI numbers, and similar identifiers.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

### `swiftbic_validate` (~82 tokens)

Structural format validation only for a SWIFT/BIC code: 8 or 11 characters (4 letters bank code + 2 letters country code + 2 alphanumeric location code + optional 3 alphanumeric branch code). The country code is not cross-checked against ISO 3166-1.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

### `vateu_validate` (~76 tokens)

Format validation only (no VIES lookup) for an EU VAT number: checks the 2-letter member-state prefix (EL for Greece, XI for Northern Ireland) against that country's digit/letter pattern. A format-valid result does not mean the number is actually registered.

Input parameters:

- `value` (string, required): identifier or value to check

Output parameters:

- `reason` (string)
- `valid` (boolean)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum#diagnostics

## Score history

- 2026-08-20: 66
- 2026-08-19: 65
- 2026-08-18: 65

## Links

- Remote endpoint: https://apished.com/mcp/v1/checksum
- Website: https://apished.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum.json
- HTML version of this page: https://verifymcp.io/servers/com-apished-checksum-validator/mcp-v1-checksum