Free no-auth tools for Spain: validate IBAN, EU VAT check (VIES), Modelo 303 sums, Veri*factu dates.
Streamable HTTP
https://api.contix.es/api/v1/mcp/herramientasclaude mcp add --transport http herramientas https://api.contix.es/api/v1/mcp/herramientasThis server publishes no installable package.