cnpj.ia.br MCP Server

by ia-cnpj Your server? Claim it

answering

cnpj.ia.br is answering right now. Last checked 10 min ago. It exposes 4 tools.

Empresas do Brasil (CNPJ): consulta por CNPJ, busca por filtros e uso da conta. Chave no header.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 33 hours of history

33 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

1050 ms

Response time

average over 24h

OAuth sign-in

Access

streamable-http

What changed 2

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 21 September 2026. No other catalogue keeps this.

21 Sep a tool description was rewritten gerar_filtro

21 Sep a tool changed the parameters it asks for buscar_empresas

This one has been quiet for a while

Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://mcp.cnpj.ia.br

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.cnpj.ia.br"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://mcp.cnpj.ia.br"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.cnpj.ia.br"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.cnpj.ia.br"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

buscar

buscar_empresas

Busca empresas por filtros. Página de até 20, paginação por meta.next_cursor (repassar em cursor). Custa 1 crédito por empresa retornada; página vazia custa 0. Ferramenta de plano pago: no plano Free responde insufficient_plan.

consultar

consultar_cnpj

Consulta um CNPJ na base. Custa 1 crédito no perfil basic (cadastro) e 6 créditos no perfil full (cadastro + telefones, e-mails, site, sócios sem CPF, regime tributário, faixa de funcionários e faturamento). Prefira basic.

gerar

gerar_filtro

Converte uma descrição em português nos filtros de buscar_empresas. Fluxo em dois passos: (1) descreva o público; (2) passe os campos devolvidos a buscar_empresas, inteiros. O campo explicacao é texto para o usuário; buscar_empresas o aceita e ignora. Custa 1 crédito por chamada.

ver

ver_uso

Uso e franquia da conta (objeto Usage inteiro, sem envelope). Custo 0.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.cnpj.ia.br	streamable-http	sign-in	1203 ms	10 min ago

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cnpj.ia.br — questions

Answers built from our own checks of this server.

What can cnpj.ia.br do?

It exposes 4 tools, read directly from the server on our last check. Among them: buscar_empresas, consultar_cnpj, gerar_filtro, ver_uso. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is cnpj.ia.br working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 1050 ms. The bar chart above shows every period we have measured.

Is cnpj.ia.br still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect cnpj.ia.br?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to cnpj.ia.br?

No API key is involved. cnpj.ia.br answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is cnpj.ia.br?

It answers our handshake in 1050 ms on average, which is faster than 9% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.