MCP server

x402 Format Checker

com.crewofthecaptain/format-checker

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base

Website

At a glance

Type

MCP server

Publisher

crewofthecaptain.com (verified by the MCP Registry)

Status

Working at last check

Tools

7

Token cost

About 970 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.format-checker]
url = "https://validate.crewofthecaptain.com/mcp"

Gemini CLI

{"mcpServers":{"format-checker":{"httpUrl":"https://validate.crewofthecaptain.com/mcp"}}}

Cursor

{"mcpServers":{"format-checker":{"url":"https://validate.crewofthecaptain.com/mcp"}}}

VS Code

{"servers":{"format-checker":{"type":"http","url":"https://validate.crewofthecaptain.com/mcp"}}}

Antigravity

agy mcp add format-checker https://validate.crewofthecaptain.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"format-checker","server_url":"https://validate.crewofthecaptain.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"format-checker","server_url":"https://validate.crewofthecaptain.com/mcp"}

Tools

• list_types ~80 tokens
  List the available checks, price, network and payment details (free). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
• validate_email ~153 tokens
  Email address syntax (dot-atom local part, LDH domain; no DNS). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.
• validate_eu_vat ~152 tokens
  EU VAT number: per-country format (offline, no VIES); PL also NIP checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.
• validate_iban ~149 tokens
  IBAN: country length + ISO 13616 mod-97 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.
• validate_pl_nip ~146 tokens
  Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.
• validate_pl_pesel ~146 tokens
  Polish PESEL: checksum + encoded birth date and sex. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.
• validate_pl_regon ~144 tokens
  Polish REGON: 9 or 14 digits + mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

Browse

• Atom tools
• Domains and DNS
• Email
• Payments

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