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IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base
Streamable HTTP
https://validate.crewofthecaptain.com/mcpclaude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcpThis server publishes no installable package.