Vinkius
CNPJ Validator

CNPJ Validator MCP for AI. Verify Brazilian Business IDs Mathematically, Every Time.

Claude Claude
ChatGPT ChatGPT
Cursor Cursor
Gemini Gemini
Windsurf Windsurf
VS Code VS Code
JetBrains JetBrains
Vercel Vercel
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Works with every AI agent you already use

…and any MCP-compatible client

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Connect to your AI in seconds.

CNPJ Validator checks Brazilian business identification numbers (CNPJs) against mathematical algorithms and structural rules. It validates basic format, deconstructs complex IDs into root, branch, and check digits, and handles high-volume batch processing for data cleaning.

What your AI can do

Analyze cnpj structure

Deconstructs a CNPJ into its root, branch, check digits, and can infer the state of registration.

Batch validate cnpjs

Performs high-volume validation on an entire list of identifiers simultaneously for efficiency.

Validate cnpj format

Checks a single CNPJ string immediately using standard checksum algorithms to confirm basic mathematical validity.

Check Mathematical Validity

Confirms if a CNPJ string passes standard checksum checks.

Deconstruct ID Components

Breaks down a full CNPJ into its specific parts: the root, branch, and check digits.

Process Large Batches

Validates an entire list of identifiers in one high-volume operation.

Infer Regional Data

Uses internal mapping rules to suggest the Brazilian state associated with the ID structure.

Included with Plan

Waiting for input…

AI Agent

CNPJ Validator: 3 Tools

These tools give you granular control over validating and dissecting Brazilian business identification numbers, from single checks to processing massive datasets.

Make your AI actually useful.

Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.

Start using CNPJ Validator on Vinkius

Analyze Cnpj Structure

Deconstructs a CNPJ into its root, branch, check digits, and can infer the state of registration.

Batch Validate Cnpjs

Performs high-volume validation on an entire list of identifiers simultaneously for...

Validate Cnpj Format

Checks a single CNPJ string immediately using standard checksum algorithms to...

Security and governance baked right in.

Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.

Claude AI

Claude AI

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.

2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL:

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.

3

Start a conversation

Open a new chat. The CNPJ Validator integration is available immediately — no restart needed.

Choose How to Get Started

Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.

Build Your Own

Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.

  • Import from OpenAPI, Swagger, or YAML specs
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  • Deploy to edge with MCPFusion framework
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  • Real time usage dashboard and cost metering
  • Publish to catalog or keep private
Start building

Make Your AI Do More

Start with CNPJ Validator, then connect any of our 5,100+ other servers whenever your AI needs more. One click, no limits.

  • Use this MCP plus 5,100+ others, all in one place
  • Add new capabilities to your AI anytime you want
  • Every connection is secured and compliant automatically
  • Track usage and costs across all your servers
  • Works with Claude, ChatGPT, Cursor, and more
  • New servers added to the catalog every week
CNPJ Validator MCP server cover

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by CNPJ Validator. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Works with Claude, ChatGPT, Cursor, and more

The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.

This connection provides 3 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.

Manually vetting business IDs is slow and error-prone.

Today, confirming a CNPJ number means checking it against outdated spreadsheets or relying on unreliable public APIs. You copy the ID into one tool to check its format, then you have to manually write down its root and branch components for reporting. If you work with lists of IDs, you're stuck running checks one by one, wasting hours.

With this MCP, your agent handles all that complexity automatically. It confirms the math first, breaks the number into readable parts, and processes entire spreadsheets in a single call. You get clean data instantly.

Get Full CNPJ Context with `analyze_cnpj_structure`

The biggest time sink is when you validate an ID, but then you have to run a second query just to figure out what the number means. You spend cycles copying the basic CNPJ into one place, and its components (root/branch) into another.

Now, `analyze_cnpj_structure` does it all in one go. It confirms validity *and* gives you the deconstructed parts—the root identifier, the branch, and even an inferred state—all from one action.

What your AI can actually do with this

You need to confirm that a CNPJ number is actually valid before you process it. This MCP provides specialized tools to verify Brazilian corporate identifiers using checksum algorithms and structural analysis. You can use your agent to perform precise validation without needing access to external federal databases. For instance, if you're building a data cleaning pipeline or an onboarding form, this tool confirms mathematically whether the number is real, breaks down its components (like finding the root identifier or inferring the state), and even processes large lists of identifiers at once.

All these powerful tools are managed through the Vinkius catalog, making it easy for your AI client to connect and start using them immediately.

Built · Hosted · Managed by Vinkius CNPJ Validator - Brazilian ID Verification MCP
Server ID 019ee7e1-e0fe-70ed-aadc-f6a02201af84
Vinkius Inspector
Compliance Grade A+
Score 100/100
Vinkius Inspector Badge — Score 100/100

Questions you might have

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

No. The validate_cnpj_format and other tools 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 tool 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.

Does the CNPJ Validator use live data from Brazilian government databases? +

No. This MCP validates numbers using internal checksum algorithms and structural rules only. It doesn't require real-time connections to external federal databases, ensuring reliability even if those systems are temporarily unavailable.

If I use `validate_cnpj_format`, what happens when the input is clearly malformed? +

The tool returns a specific error message detailing the failure. It won't just fail silently; it reports exactly why the number failed, such as an incorrect checksum or wrong character length.

Does `batch_validate_cnpjs` have usage limits or rate caps? +

Usage is managed through your Vinkius subscription tier. While designed for high throughput, consult the platform documentation if you anticipate enterprise-level volume above standard rates.

How does the CNPJ Validator handle data security and privacy? +

Data processing stays within the secure MCP framework. The tool never transmits sensitive business identifiers to external third parties, keeping your inputs private throughout validation.

What is needed to connect my AI agent to this CNPJ Validator MCP? +

You just need an active subscription on Vinkius and compatibility with any MCP-compatible client (like Claude or Cursor). No complex API keys or local server setup is required.

Built & Managed by Vinkius 30s setup 3 tools

We've already built the connector for CNPJ Validator. Just plug in your AI agents and start using Vinkius.

No hosting. No infrastructure. No complex setup.
All 3 tools are live and waiting. You're up and running in seconds.

Vinkius runs on Claude Claude
Vinkius runs on ChatGPT ChatGPT
Vinkius runs on Cursor Cursor
Vinkius runs on Gemini Gemini
Vinkius runs on Windsurf Windsurf
Vinkius runs on VS Code VS Code
Vinkius runs on JetBrains JetBrains
Vinkius runs on Vercel Vercel
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