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CheckDigit MCP Server

by workers-mike-tusa-checkdigit Your server? Claim it
answering

CheckDigit is answering right now. Last checked 4 min ago. It exposes 2 tools.

Offline check-digit validation for IBAN, BIC, EU VAT, GTIN/EAN/UPC and ISBN. Format check only.

Uptime history 22 hours of history
22 hours agonow
100.0%
Uptime 24h
80 of 80 checks
2
Tools
read from the server
62 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 16 October 2026. No other catalogue keeps this.

16 Oct a tool changed version

Nothing serious here today

Today is the operative word: we check CheckDigit every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add checkdigit --transport http https://checkdigit.mike-tusa.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "checkdigit": {
      "url": "https://checkdigit.mike-tusa.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.checkdigit]
url = "https://checkdigit.mike-tusa.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "checkdigit": {
      "url": "https://checkdigit.mike-tusa.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "checkdigit": {
      "url": "https://checkdigit.mike-tusa.workers.dev/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

meta
get_meta
Return the service version and build, supported IBAN and VAT countries, GTIN formats, the disclaimer and the current limits. Does not count as a check. Read-only. Same data as GET /v1/meta.
validate
validate_code
Check the format and check digits of one identifier: IBAN (ISO 13616, per-country length and layout), BIC/SWIFT (ISO 9362 format and country), EU VAT number (offline checksum, VIES not queried), GTIN/EAN-8/UPC-A/EAN-13/GTIN-14 (GS1 mod 10) or ISBN-10/13. type "auto" (default) detects the type from the shape. Returns valid, a reason when invalid (e.g. the expected check digit), and normalized/formatted forms. Format check, not a compliance check: valid does not mean the account, registration or product exists. The code is sent in a POST body and not stored or logged. Read-only. Same engine, keys and limits as POST /v1/{type}.

Endpoints

URLTransportStateLatencyChecked
https://checkdigit.mike-tusa.workers.dev/mcp streamable-http answering 58 ms 4 min ago

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CheckDigit — questions

Answers built from our own checks of this server.

What can CheckDigit do?
It exposes 2 tools, read directly from the server on our last check. Among them: get_meta, validate_code. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is CheckDigit working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 80 of 80 checks got a reply (100.0%), average response time 62 ms. The bar chart above shows every period we have measured.
How do I connect CheckDigit?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does CheckDigit need an API key?
No. CheckDigit completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is CheckDigit?
It answers our handshake in 62 ms on average, which is faster than 93% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.