Does this tool check for tax compliance?

Yes, the validatebusinesscompliance tool audits components like Model and Emission Type against official regulatory catalogs.

NF-e Validator Connector for AI agents.

Q: Does the NF-e Access Key Validator check for regional compliance?

It does. The tool audits the components of the key against official tax authority standards to ensure they are correct for the region.

Q: How can I see the issuer's details?

Use the extractkeymetadata tool. It will parse the key and return the CNPJ, State Code, and other relevant metadata.

3 live capabilities

Validate Brazilian tax invoice keys and extract business metadata automatically.

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Why people use NF-e Validator

NF-e Access Key Validator for Brazilian Tax Compliance

This Connector handles the heavy lifting for you. Your agent takes the key, verifies the math, and hands you a clean breakdown of the business metadata in one go. You move from manual data entry to high-level oversight.

What Vinkius changes

You get instant, accurate validation of Brazilian tax keys without manual calculation.

Use it from Claude, ChatGPT, Cursor or another AI client you already have.

One account · 6,100+ Connectors

Real-world use case 01

Batch auditing of tax receipts

An accountant has a list of 500 keys and needs to know which ones are valid for a tax return without clicking each one.
Real-world use case 02

Automated vendor data entry

A logistics manager uses an agent to pull CNPJ numbers from a batch of vendor keys to update a shipping database.
Real-world use case 03

Regional compliance checks

A tax auditor wants to see if a specific key's components match the required regional codes for a specific state.

Complete set · 3capabilities

The complete NF-e Validator capability set.

These are the exact actions your AI can choose when you ask it to work with NF-e Validator.

Capability set01 / 01

01—03

3 capabilities in this set.

Part of 3 available through NF-e Validator.

01 Capability
Extract key metadata
Breaks a valid key into readable parts like CNPJ, State Code, and Model. This is useful for quickly populating databases.
02 Capability
Validate business compliance
Checks if the extracted components meet specific tax authority standards. It helps ensure your records are legally sound.
03 Capability
Verify key structure
Confirms the 44-digit sequence is mathematically correct using the Modulo 11 algorithm. It filters out junk data immediately.

Set up in minutes

One URL. Then ask NF-e Validator to work.

Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use NF-e Validator from the conversation.

Choose your client

Live preview

Advanced clients IDE · CLI

Claude · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP

https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp

Step 01

Open Connectors

In Claude Web or Claude Desktop, open Settings and choose Connectors.
Step 02

Add the URL

Choose Add custom connector, name it NF-e Validator, and paste the URL above.
Step 03

Turn it on in chat

Select +, open Connectors, and enable NF-e Validator for the conversation.

ChatGPT · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP

https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp

Step 01

Open MCP settings

On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
Step 02

Add the URL

Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the NF-e Validator URL.
Step 03

Save and start

Save the connection and enable NF-e Validator in your conversation. Desktop may ask you to restart once.

Cursor · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "nf-e-access-key-validator": {
      "url": "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp"
    }
  }
}

Step 01

Open MCP Settings

Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
Step 02

Add the server config

Paste the JSON configuration above into the mcp.json file that opens
Step 03

Save the file

Cursor will automatically detect the new Connector
Step 04

Start using NF-e Validator

Open Agent mode in chat and ask: "Using NF-e Validator, help me...". 3 tools available

VS Code Copilot · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "nf-e-access-key-validator": {
      "url": "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp"
    }
  }
}

Step 01

Create MCP config

Create a .vscode/mcp.json file in your project root
Step 02

Add the server config

Paste the JSON configuration above
Step 03

Enable Agent mode

Open GitHub Copilot Chat and switch to Agent mode using the dropdown
Step 04

Start using NF-e Validator

Ask Copilot: "Using NF-e Validator, help me...". 3 tools available

Windsurf · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "nf-e-access-key-validator": {
      "url": "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp"
    }
  }
}

Step 01

Open MCP Settings

Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
Step 02

Add the server

Paste the JSON configuration above into mcp_config.json
Step 03

Save and reload

Windsurf will detect the new server automatically
Step 04

Start using NF-e Validator

Open Cascade and ask: "Using NF-e Validator, help me...". 3 tools available

Cline · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "nf-e-access-key-validator": {
      "url": "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp"
    }
  }
}

Step 01

Open Cline MCP Settings

Click the Connectors icon in the Cline sidebar panel
Step 02

Add remote server

Click "Add Connector" and paste the configuration above
Step 03

Enable the server

Toggle the server switch to ON
Step 04

Start using NF-e Validator

Ask Cline: "Using NF-e Validator, help me...". 3 tools available

Claude Code · Terminal command

Official guide ↗

Advanced setup

claude mcp add nf-e-access-key-validator --transport http "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp"

Step 01

Install Claude Code

Run npm install -g @anthropic-ai/claude-code if not already installed
Step 02

Add the Connector

Run the command above in your terminal
Step 03

Verify the connection

Run claude mcp to list connected servers, or type /mcp inside a session
Step 04

Start using NF-e Validator

Ask Claude: "Using NF-e Validator, show me...". 3 tools are ready

Where the request belongs

Work NF-e Validator can move forward.

Built around the request

This is for professionals managing Brazilian tax documentation who need to process large volumes of invoices without manual data entry errors.

Brazilian Accountant

Verifying hundreds of invoice keys for tax filing and ensuring they meet regional requirements.

Logistics Coordinator

Checking vendor invoice keys to ensure shipments are properly documented and the CNPJ is correct.

Tax Compliance Officer

Auditing historical tax data to find inconsistencies in business identifiers or state codes.

Build the capability set

Each Connector adds new actions and data without changing how you work.

Browse Connectors

01 10 capabilities

NFe.io

Orchestrate NFe.io services. manage service invoices (NFS-e), validate city codes, and monitor company data directly from any AI agent.

View Connector

02 3 capabilities

CNPJ Validator

Verify the mathematical validity and structure of Brazilian CNPJ numbers.

View Connector

03 3 capabilities

DAS Payment Scheduler

Automated annual calendar generator for Brazilian Simples Nacional tax payments, handling holiday-based date shifts and overdue period alerts.

View Connector

04 3 capabilities

DECORE Simulator

Calculate and validate income declarations for regulatory compliance.

View Connector

05 8 capabilities

Focus Varejo

Emit NFC-e, NFCom, manifest documents and manage retail invoices via Focus NFe API.

View Connector

06 5 capabilities

Focus NFe

Emit, consult, cancel and download XML for NFS-e and NF-e via Focus NFe API.

View Connector

Bring your own AI

Change the model, client or framework. Keep NF-e Validator connected.

Claude
ChatGPT
Gemini
Cursor
VS Code
Windsurf
ZCode
Cline
Zed
Continue
Kiro
Roo Code
Zencoder
Goose
Void
Augment Code
Amp
Qodo
Tabnine
Pieces
Sourcegraph Cody
JetBrains
Warp
Amazon Q
Antigravity
BoltAI
Raycast
Jan
LM Studio
AnythingLLM
Open WebUI
Msty
Cherry Studio
LibreChat
TypingMind
Chorus
5ire
n8n
LangChain
LlamaIndex
CrewAI
Vercel AI SDK

Before you connect

Questions about NF-e Validator.

The practical details behind the request, access and result.

Can the NF-e Access Key Validator handle Brazilian tax keys?

Yes, it is designed specifically for the 44-digit Brazilian NF-e keys. It handles the math and the data extraction for you automatically.

How does the NF-e Access Key Validator check for errors?

It uses the Modulo 11 algorithm to verify the mathematical integrity of the key. It also checks the length to make sure it's a valid sequence.

Can I use the NF-e Access Key Validator to get a company's CNPJ?

Yes, once the key is validated, the Connector can pull out the CNPJ and other business details like the State Code and invoice number.

Does the NF-e Access Key Validator check for regional compliance?

It does. The capability audits the components of the key against official tax authority standards to ensure they are correct for the region.

Is the NF-e Access Key Validator good for high-volume auditing?

It's ideal for that. Because it's an Connector, your agent can process hundreds of keys in a loop without you having to do any manual clicking.

What does `verify_key_structure` do?

It checks if the 44-digit sequence is purely numeric, exactly 44 digits long, and passes the Modulo 11 checksum verification.

How can I see the issuer's details?

Use the extract_key_metadata capability. It will parse the key and return the CNPJ, State Code, and other relevant metadata.

Does this capability check for tax compliance?

Yes, the validate_business_compliance capability audits components like Model and Emission Type against official regulatory catalogs.

One connection away

Give your agent a direct line to NF-e Validator.

Connect NF-e Validator once. Keep it beside 6,100+ managed Connectors when the next task needs more.

Explore every Connector No credit card required · Free tier available

NF-e Access Key Validator for Brazilian Tax Compliance

You get instant, accurate validation of Brazilian tax keys without manual calculation.

Batch auditing of tax receipts

Automated vendor data entry

Regional compliance checks

Extract key metadata

Validate business compliance

Verify key structure

Open Connectors

Add the URL

Turn it on in chat

Open MCP settings

Add the URL

Save and start

Open MCP Settings

Add the server config

Save the file

Start using NF-e Validator

Create MCP config

Add the server config

Enable Agent mode

Start using NF-e Validator

Open MCP Settings

Add the server

Save and reload

Start using NF-e Validator

Open Cline MCP Settings

Add remote server

Enable the server

Start using NF-e Validator

Install Claude Code

Add the Connector

Verify the connection

Start using NF-e Validator

Brazilian Accountant

Logistics Coordinator

Tax Compliance Officer

NFe.io

CNPJ Validator

DAS Payment Scheduler

DECORE Simulator

Focus Varejo

Focus NFe

Give your agent a direct line to NF-e Validator.