Check Digit Validator
Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit
MCP server · by gumballtools.com
About
Check Digit Validator is an MCP server published by gumballtools.com. Marketplaces we read that list it: 1 (Official MCP Registry). We first saw it on 2026-10-11 and have recorded no change since. As of our marketplace pass on 2026-10-12.
What it asks for
- Runs remotely
None of the marketplaces we read publishes its tools or the settings it asks for.
What it declares, asks for and runs, in full
Only install plugins from developers you trust. We list what marketplaces publish and do not test plugins.
Works with
- Claude Code
- Codex
- Cursor
- VS Code
- Copilot CLI
A one-click link opens the client, which asks you to confirm before it adds the server.
From the marketplaces that list it and the MCP transport it declares, as each client documents them. We do not test plugins.
Connect
Commands and configs built only from what its marketplaces declare. We do not run them for you and do not test plugins.
As a remote MCP server
Built from what Official MCP Registry declares.
claude mcp add --transport http check-digit https://check-digit.gumballtools.com/api/mcp[mcp_servers.check-digit]
url = "https://check-digit.gumballtools.com/api/mcp"{
"mcpServers": {
"check-digit": {
"url": "https://check-digit.gumballtools.com/api/mcp"
}
}
}Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 0.1.0 | No figure published | Not marked |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
What changed
Nothing has moved on this plugin since we started watching it.
Possibly the same plugin
Listings that share a signal with this one but not enough for us to treat them as the same product.
Similar plugins
Products whose own names, descriptions, tools and skills are closest in meaning to this one, on every marketplace we read. Closeness is ranked within this list only.
-
Validates Luhn, IBAN, ISBN, EAN/UPC, SWIFT/BIC, and EU VAT checksums and formats.
-
veridigit io.github.qinisolabs/veridigit
Verified IBAN, card, ISBN-13 & VIN validation for AI agents — checksums, not guesses.
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ident-mcp io.github.nexus-api-lab/ident-mcp
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Validates PESEL/NIP/REGON/IBAN/Luhn/ISBN/EAN/BIC/VAT; RPN, dates, hash, tokens, random, encode, time
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Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex.
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IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base
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OpenIBAN MCP — validate an IBAN's checksum + bank code and resolve the
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Duo Data Utilities: IBAN, ISIN, VAT & Tax ID, Barcode, Timezone, Geo APIs
IBAN, ISIN, VAT/tax ID, GTIN validation; timezone, geo, text, chain utilities. Pay per call
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iban-validator-mcp io.github.mrfentmen/iban-validator-mcp
Validate and format IBAN bank account numbers locally. No network and no key.
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Found by meaning, not by shared code or a shared repository: similar plugins stay separate products, and this is not a review or a recommendation.
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Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.