Validation

Mod-11 Checksum Calculator

Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/mod11-checksum' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"validate","scheme":"isbn-10","number":"e.g., 0306406152 (ISBN-10) — spaces/dashes ignored","length":10,"prefix":"e.g., 0306 (leading digits to lock when generating)"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/mod11-checksum

Parameters

Name	Type	Required	Description
mode	select	Yes	—
scheme	select	Yes	—
number	text	Yes	Any Mod-11 number. Separators are ignored; the last digit is the check digit.
length	number	No	Total digit count including the check digit (generate mode).
prefix	text	No	Lock the leading digits of the generated number.

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-mod11-checksum": {
      "name": "mod11-checksum",
      "description": "Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=mod11-checksum",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "mod11-checksum",
    "arguments": {
  "mode": "validate",
  "scheme": "isbn-10",
  "number": "e.g., 0306406152 (ISBN-10) — spaces/dashes ignored",
  "length": 10,
  "prefix": "e.g., 0306 (leading digits to lock when generating)"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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