Checksum Validator
Validates Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT checksums and formats.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"checksum-validator": {
"url": "https://apished.com/mcp/v1/checksum"
}
}
}Remote endpoints
https://apished.com/mcp/v1/checksumstreamable-httpWhat it can do
Tool inventory
Tools (6)
🟢ean_validate(value)
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 Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}⚪iban_validate(value)
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 Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}⚪isbn_validate(value)
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 Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}⚪luhn_validate(value)
Validates a numeric string against the Luhn (mod-10) checksum — payment card numbers, IMEI numbers, and similar identifiers.
Input Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}⚪swiftbic_validate(value)
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 Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}⚪vateu_validate(value)
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 Schema
{
"type": "object",
"properties": {
"value": {
"type": "string",
"description": "identifier or value to check"
}
},
"required": [
"value"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"required": [
"valid"
],
"additionalProperties": false
}Community
Evidence