contix herramientas

es.contix/herramientasVersion 1.0.0

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

Status

Responds112 msNov 14, 2026, 14:30 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:30 UTC
Latency: 112 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: EU hosting detected (detected, not a legal statement)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://api.contix.es/api/v1/mcp/herramientasResponds112 msNov 14, 2026, 14:30 UTC

No sign-in

Claude Code

claude mcp add --transport http herramientas https://api.contix.es/api/v1/mcp/herramientas

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: herramientas
Remote MCP server URL: https://api.contix.es/api/v1/mcp/herramientas

Cursor

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

VS Code

code --add-mcp '{"name":"herramientas","type":"http","url":"https://api.contix.es/api/v1/mcp/herramientas"}'

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Tools

6 tools

Tools of contix herramientas
	Description		Read-only	Idempotent	Open world
`calculate_modelo_303`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 or deduction applies and it is not a tax return. To compute the 303 from an existing contix account's own invoices and gastos instead of typed-in boxes, use get_modelo with model 303.	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 or deduction applies and it is not a tax return. To compute the 303 from an existing contix account's own invoices and gastos instead of typed-in boxes, use get_modelo with model 303.	Not declared	Yes	Not declared	No
`calculate_vat`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 / reverse VAT). It only applies the rates it is given: it does NOT decide which VAT or IRPF rate applies to a case. Returns base_imponible, cuota_iva, recargo_importe, retencion_irpf, total_con_iva and total_factura (total after subtracting the IRPF withholding).	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 / reverse VAT). It only applies the rates it is given: it does NOT decide which VAT or IRPF rate applies to a case. Returns base_imponible, cuota_iva, recargo_importe, retencion_irpf, total_con_iva and total_factura (total after subtracting the IRPF withholding).	Not declared	Yes	Not declared	No
`check_vat_number`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 as an invalid number.	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 as an invalid number.	Not declared	Yes	Not declared	Yes
`get_obligation_dates`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 text for each obligation (verifactu, factura_electronica and, where it applies, estados_facturas).	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 text for each obligation (verifactu, factura_electronica and, where it applies, estados_facturas).	Not declared	Yes	Not declared	No
`validate_iban`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. Pure arithmetic: it does NOT confirm that the account exists or who owns it.	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. Pure arithmetic: it does NOT confirm that the account exists or who owns it.	Not declared	Yes	Not declared	No
`validate_spanish_tax_id`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 letter + 7 digits + check digit or letter, with the entity type per Orden EHA/451/2008). Tolerates spaces, dots, dashes and an ES prefix. Pure arithmetic: it does NOT confirm the document exists, is active or belongs to the person who gave it. In validation mode, returns valido (true/false) and, when it does not match, the correct check character (letra_correcta / control_correcto).	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 letter + 7 digits + check digit or letter, with the entity type per Orden EHA/451/2008). Tolerates spaces, dots, dashes and an ES prefix. Pure arithmetic: it does NOT confirm the document exists, is active or belongs to the person who gave it. In validation mode, returns valido (true/false) and, when it does not match, the correct check character (letra_correcta / control_correcto).	Not declared	Yes	Not declared	No

Details

Registry status: Active
Published: Oct 1, 2026
Updated: Oct 1, 2026
Website: https://contix.es/herramientas/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): Invoicing and accountingSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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