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Validar números de IVA da UE MCP server

Which MCP servers are Validar números de IVA da UE's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-29

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Whose server it is
  • Registry namept.iva/ivaverified in the MCP registry

The registry name sits under iva.pt. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-29
  • Stateanswerschecked 2026-10-29
  • Tools4
  • Server calls itselfiva.pt
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-29 the server answered initialize and tools/list without a sign-in. First answer in 528 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 5 of the 7 days it takes to judge reliability.

Once connected

  • For "check an EU VAT number against the VIES system", the likely first call is validar_iva.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-29
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
  • Answeredmeasuring5 of the 7 daily checks it takes to print a share
  • Median first answer528 ms
  • Space in an agent's context≈ 692 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · check an EU VAT number against the VIES system
  • not sure · obtain a VIES consultation number as proof of validation
  • not sure · save a PDF validation report alongside the invoice

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-29
  • validar_iva

    Valida em tempo real um número de IVA intracomunitário de qualquer Estado-membro da UE (ou da Irlanda do Norte, XI) no sistema VIES da Comissão Europeia. Devolve se é válido e, quando o Estado-membro os disponibiliza, o nome e a morada…

  • artigo_civa

    Devolve o texto em vigor de um artigo do Código do IVA português (CIVA), com a ligação para iva.pt. Fonte: Autoridade Tributária e Aduaneira. Também em inglês (tradução não oficial) com idioma=en. Portuguese VAT Code article, optionally…

  • artigo_riti

    Devolve o texto em vigor de um artigo do Regime do IVA nas Transações Intracomunitárias (RITI), com a ligação para iva.pt. Fonte: Autoridade Tributária e Aduaneira. Também em inglês (tradução não oficial) com idioma=en.

  • pesquisar_legislacao

    Pesquisa por palavras (em português) nos títulos e no texto dos artigos do Código do IVA e do RITI. Devolve os artigos mais relevantes com ligação. Use depois artigo_civa ou artigo_riti para ler o texto.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "iva": {
      "type": "http",
      "url": "https://iva.pt/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http iva https://iva.pt/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://iva.pt/mcp as a custom connector in the settings.

OpenAPI spec

4 paths, read 2026-10-29. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.