Does this MCP require an internet connection to federal databases?

No. It uses internal checksum algorithms and mapping rules to validate numbers without external dependencies.

Can I validate multiple CNPJs at the same time?

Yes. You can use the batch validation capability to process a list of identifiers in one go.

What information can the AI extract from a CNPJ?

The AI can deconstruct the ID into its root, branch, and check digits, and it can also infer the state of registration.

Which AI clients can use this MCP?

Any MCP-compatible client like Claude, Cursor, Windsurf, or VS Code can use this capability.

Is this for checking if a company is active?

This MCP checks the mathematical and structural validity of the number. It does not check the current active status in federal registries.

Does this capability require an internet connection to the Brazilian Federal Revenue?

No. The validate_cnpj_format and other capabilities use a local checksum algorithm (weighted summation) to verify the mathematical validity of the CNPJ without making external API calls to federal databases.

Can I validate multiple CNPJs at once?

Yes, you can use the batch_validate_cnpjs capability to process an array of CNPJ strings in a single operation and receive summary statistics.

What information is returned when analyzing a CNPJ?

By using analyze_cnpj_structure, you will receive the root identifier, branch identifier, check digits, and the inferred Brazilian state (UF) based on regional mapping rules.

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Connect CNPJ Validator to ChatGPT, Claude and Gemini

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Verify and deconstruct business IDs without external database calls.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 3 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through CNPJ Validator.

01
Analyze cnpj structure
This capability breaks a CNPJ down into its individual parts. It separates the root, branch, and check digits for a clear view of the ID structure.
02
Validate cnpj format
This capability runs a checksum algorithm on a CNPJ string. It confirms if the number is mathematically valid.
03
Batch validate cnpjs
This capability processes a large list of identifiers all at once. It is built for high-volume validation tasks.

Real work

What teams actually run

Data Cleaning

Your agent scrubs a database of Brazilian companies to remove invalid or malformed CNPJs.

Automated Compliance

The AI checks new business entries against checksum rules to ensure they meet structural requirements.

Business Identification

You use the capability to extract specific parts of a CNPJ to categorize companies by branch or root.

Bulk Verification

You pass a long list of identifiers to the AI to quickly flag invalid entries in a spreadsheet.

Automate a task

Put CNPJ Validator to work on one thing.

Step-by-step automations your AI runs through this Connector: the workflow, the prompts to start with, and the exact capabilities behind each move.

One connector, every AI

CNPJ Validator works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

Building your own app? The connector is yours to use.

You don't need a client to put CNPJ Validator to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

688ms average. Fast in production.

CNPJ Validator is checked daily against the live service.

Daily averagePeak 897ms

Oct 3Today

Fastest day: 548ms
Slowest day: 897ms
14-day trend: Slowing+29%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of CNPJ Validator, so you can see the experience inside your AI.

It does not authenticate your account with CNPJ Validator. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

CNPJ Validator Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_h5b23zF0Z9FsG4JVtouuZu9rJr0WPyPK7WWuZJWt/mcp

Claude Desktop

Follow the steps below to connect in seconds.

1In Claude Desktop, open Settings → Connectors.
2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
3Click Add and start a new chat — CNPJ Validator capabilities are ready to use.

Configuration · claude_desktop_config.jsonCopy

{
  "mcpServers": {
    "cnpj-validator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_h5b23zF0Z9FsG4JVtouuZu9rJr0WPyPK7WWuZJWt/mcp"
    }
  }
}

Claude
ChatGPT
Cursor
VS Code
Windsurf
Claude Code
JetBrains
Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up CNPJ Validator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work CNPJ Validator owners hand off.

This MCP is built for professionals managing Brazilian business data who need to ensure ID accuracy without manual lookups.

01
Data Analysts
They hand off large datasets to the AI to clean and validate business IDs.
02
Compliance Officers
They use the capability to automate the verification of company identifiers.
03
Software Developers
They integrate this logic into automated workflows for data entry and validation.

FAQ

Questions CNPJ Validator owners ask.

01
Does this MCP require an internet connection to federal databases?
No. It uses internal checksum algorithms and mapping rules to validate numbers without external dependencies.
02
Can I validate multiple CNPJs at the same time?
Yes. You can use the batch validation capability to process a list of identifiers in one go.
03
What information can the AI extract from a CNPJ?
The AI can deconstruct the ID into its root, branch, and check digits, and it can also infer the state of registration.
04
Which AI clients can use this MCP?
Any MCP-compatible client like Claude, Cursor, Windsurf, or VS Code can use this capability.
05
Is this for checking if a company is active?
This MCP checks the mathematical and structural validity of the number. It does not check the current active status in federal registries.
06
Does this capability require an internet connection to the Brazilian Federal Revenue?
No. The validate_cnpj_format and other capabilities use a local checksum algorithm (weighted summation) to verify the mathematical validity of the CNPJ without making external API calls to federal databases.
07
Can I validate multiple CNPJs at once?
Yes, you can use the batch_validate_cnpjs capability to process an array of CNPJ strings in a single operation and receive summary statistics.
08
What information is returned when analyzing a CNPJ?
By using analyze_cnpj_structure, you will receive the root identifier, branch identifier, check digits, and the inferred Brazilian state (UF) based on regional mapping rules.

Explore

More in Finance

Connect CNPJ Validator to Claude, Cursor, ChatGPT & more

Your AI does the work. We keep it safe and sound.

Each Connector runs inside its own sealed environment.

One switch stops every agent. Instantly.

Spending limits that pause instead of surprise.

We ship only the actions that matter.

01-03

Analyze cnpj structure

Validate cnpj format

Batch validate cnpjs

What teams actually run

Data Cleaning

Automated Compliance

Business Identification

Bulk Verification

Building your own app? The connector is yours to use.

CNPJ Validator Connector

Claude Desktop

Data Analysts

Compliance Officers

Software Developers

Does this MCP require an internet connection to federal databases?

Can I validate multiple CNPJs at the same time?

What information can the AI extract from a CNPJ?

Which AI clients can use this MCP?

Is this for checking if a company is active?

Does this capability require an internet connection to the Brazilian Federal Revenue?

Can I validate multiple CNPJs at once?

What information is returned when analyzing a CNPJ?

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