com.crewofthecaptain/format-checker

up checked 2026-11-11T00:37:49.863Z

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Publisher-provided title

x402 Format Checker

Publisher-provided description

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

Summary by lookupd

Validates IBAN, EU VAT, Polish NIP/REGON/PESEL and email formats offline per check, paid per call in USDC via x402.

Install

Claude Code, remote (streamable-http)

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

Codex, remote (streamable-http)

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

Cursor, remote (streamable-http) → .cursor/mcp.json

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

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (7 tools)

Publisher-provided text

list_types 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_iban 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}; th
validate_eu_vat 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, vali
validate_pl_nip 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, reas
validate_pl_regon 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
validate_pl_pesel 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};
validate_email 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, normalize

Details

Version: 1.3.0
Transports: streamable-http
Uptime (7 days): 100%
Median latency: 390 ms
First indexed: 2026-11-01T08:53:33.249Z
Last seen in registry: 2026-11-01T08:53:33.258Z
Website: https://validate.crewofthecaptain.com/

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Last crawl: 2026-11-11T16:39:06.253Z
API base: https://api.lookupd.com
MCP URL: https://api.lookupd.com/mcp