MCP server

contix herramientas Official

es.contix/herramientas

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

Free no-auth tools for Spain: validate IBAN, EU VAT check (VIES), Modelo 303 sums, Veri*factu dates.

Website

At a glance

Type

MCP server

Publisher

contix.es (verified by the MCP Registry)

Status

Working at last check

Tools

6

Token cost

About 1,468 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 herramientas https://api.contix.es/api/v1/mcp/herramientas

Claude Desktop

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

Codex (config.toml)

[mcp_servers.herramientas]
url = "https://api.contix.es/api/v1/mcp/herramientas"

Gemini CLI

{"mcpServers":{"herramientas":{"httpUrl":"https://api.contix.es/api/v1/mcp/herramientas"}}}

Cursor

{"mcpServers":{"herramientas":{"url":"https://api.contix.es/api/v1/mcp/herramientas"}}}

VS Code

{"servers":{"herramientas":{"type":"http","url":"https://api.contix.es/api/v1/mcp/herramientas"}}}

Antigravity

agy mcp add herramientas https://api.contix.es/api/v1/mcp/herramientas

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":"herramientas","server_url":"https://api.contix.es/api/v1/mcp/herramientas","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"herramientas","server_url":"https://api.contix.es/api/v1/mcp/herramientas"}

Tools

• calculate_modelo_303 ~253 tokens
  Add up the boxes (casillas) of the Spanish quarterly VAT return Modelo 303 with the formulas printed on the official AEAT form: 27, 45, 46, 64, 66, 87, 69 and 71. Input are the tax amounts (cuotas) per box, e.g. {"09": 17430, "29": 9870}. It only sums what it is given: it does not decide which rate
• calculate_vat ~361 tokens
  Compute the taxable base, VAT (IVA) amount, optional recargo de equivalencia and optional IRPF withholding from an amount. By default `importe` is the taxable base (sin IVA). With incluye_iva=true, `importe` is the TOTAL with VAT already included and the base is derived backwards (quitar IVA / rever
• check_vat_number ~180 tokens
  Look up an EU VAT number in the European Commission's VIES registry. Returns what the registry says: whether the number exists and, where the member state publishes it, the name and address. It draws NO tax conclusion. VIES is often down; that is reported as disponible=false, which is NOT the same a
• get_obligation_dates ~258 tokens
  Deadlines from the published Spanish rules: Veri*factu (RD 1007/2023, dates of RD-ley 15/2025) and mandatory B2B e-invoicing (RD 238/2026, counted from the ministerial order, provisional while the order is a draft). Information about the rules, not advice. Returns a date (or null) and explanatory te
• validate_iban ~164 tokens
  Check whether an IBAN is well formed: country length (SWIFT IBAN registry) and ISO 13616 check digits. For Spanish IBANs also the two account check digits (DC) and the bank (entidad) with its BIC from the Banco de España registry. A 20-digit Spanish account number (CCC) is converted to its IBAN. Pur
• validate_spanish_tax_id ~252 tokens
  Two modes in one input. If `valor` is only 1-8 digits, computes the DNI check letter and returns the full 8-digit-plus-letter DNI (digits are left-padded with zeros). If `valor` is a full document, validates its check character: DNI (8 digits + letter), NIE (X/Y/Z + 7 digits + letter) or CIF (entity

Browse

• Invoicing and accounting

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