# Checksum Validator

> Checksum Validator — com-apished-checksum-validator. Use this tool when you need to verify the integrity and format of various identification numbers, such as credit card numbers, bank accounts, or product codes. It solves problems related to data entry errors, invalid formats, and potential fraud by validating checksums for Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT numbers. It takes a numeric input and returns a validation result, indicating whether the number is valid or not.

Canonical page: https://skillsregistry.net/skills/com-apished-checksum-validator  
JSON: https://api.skillsregistry.net/v1/skills/com-apished-checksum-validator

## Description

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

## Trust

- **Trust score (0–1):** 0.30
- **Verification tier:** unverified
- **Last scanned:** 2026-09-02

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-02

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/com.apished%2Fchecksum-validator)

## Use it

MCP endpoint published by the skill: `https://apished.com/mcp/v1/checksum`

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "com-apished-checksum-validator"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/com-apished-checksum-validator` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/com-apished-checksum-validator/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt