Validation

Luhn Checksum Calculator

Validate or generate numbers using the Luhn algorithm (mod-10). Works for credit cards, IMEI, IMEISV, SIN, NPI and any custom Luhn-based identifier.

text· Text resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/luhn-checksum' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"validate","number":"e.g., 4532015112830366 (spaces/dashes ignored)","length":16,"prefix":"e.g., 4 for Visa, 35 for JCB (leave blank for random)"}'

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/luhn-checksum

Parameters

Name	Type	Required	Description
mode	select	Yes	—
number	text	Yes	Any Luhn-based number. Separators are ignored.
length	number	No	Total digit count including the check digit.
prefix	text	No	Lock the leading digits of the generated number.

Response format

Text result

JSON

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

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-luhn-checksum": {
      "name": "luhn-checksum",
      "description": "Validate or generate numbers using the Luhn algorithm (mod-10). Works for credit cards, IMEI, IMEISV, SIN, NPI and any custom Luhn-based identifier.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=luhn-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": "luhn-checksum",
    "arguments": {
  "mode": "validate",
  "number": "e.g., 4532015112830366 (spaces/dashes ignored)",
  "length": 16,
  "prefix": "e.g., 4 for Visa, 35 for JCB (leave blank for random)"
}
  }
}

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]

Browse tools Open tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/luhn-checksum' \ -H 'Content-Type: application/json' \ -d '{"mode":"validate","number":"e.g., 4532015112830366 (spaces/dashes ignored)","length":16,"prefix":"e.g., 4 for Visa, 35 for JCB (leave blank for random)"}'

Name

Type

Required

Description

mode

select

Yes

—

number

text

Yes

Any Luhn-based number. Separators are ignored.

length

number

Total digit count including the check digit.

prefix

text

Lock the leading digits of the generated number.

{ "mcpServers": { "elysiatools-luhn-checksum": { "name": "luhn-checksum", "description": "Validate or generate numbers using the Luhn algorithm (mod-10). Works for credit cards, IMEI, IMEISV, SIN, NPI and any custom Luhn-based identifier.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=luhn-checksum", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "luhn-checksum", "arguments": { "mode": "validate", "number": "e.g., 4532015112830366 (spaces/dashes ignored)", "length": 16, "prefix": "e.g., 4 for Visa, 35 for JCB (leave blank for random)" } } }