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Connect Nf E Access Key Validator to ChatGPT and Claude

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 Brazilian electronic invoice keys instantly with your agent.

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.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

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.

A futuristic MCP client docking bay
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 NF-e Validator.

  1. 01

    Extract key metadata

    This capability breaks a valid access key into its specific business parts like CNPJ and State Code for easy inspection.

  2. 02

    Verify key structure

    Your agent uses this to check if a 44-digit sequence is mathematically valid using the Modulo 11 algorithm.

  3. 03

    Validate business compliance

    This capability audits the components of a key to ensure they follow official tax authority standards.

Real work

What teams actually run

01

Bulk Invoice Auditing

Your agent checks a long list of keys to ensure they are all structurally valid.

02

Data Extraction

You provide a raw key and the agent returns the specific business metadata.

03

Compliance Checks

The agent verifies that the components within a key adhere to tax authority rules.

04

Error Detection

Identify invalid or malformed NF-e keys before they enter your accounting system.

Automate a task

Put NF-e 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

NF-e 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.

ClaudeClaudeChatGPTChatGPTGeminiGeminiPerplexityPerplexityGrokGrokMicrosoft CopilotMicrosoft CopilotCursorCursorVS CodeVS CodeWindsurfWindsurfJetBrainsJetBrainsClineClineLangChainLangChainVercel AI SDKVercel AI SDKLovableLovableZ.aiZ.aiRaycastRaycastQwen CodeQwen CodeKimi CodeKimi CodeLe ChatLe Chat

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

You don't need a client to put NF-e 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

696ms average. Fast in production.

NF-e Validator is checked daily against the live service.

Daily averagePeak 991ms
Oct 3Today
Fastest day
544ms
Slowest day
991ms
14-day trend
Stable+3%

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 NF-e Validator, so you can see the experience inside your AI.

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

NF-e Validator Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — NF-e Validator capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "nf-e-access-key-validator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_IRwsYmnDubhWF6CADb8mHPMbLhjrqO48Mkm0iChQ/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 NF-e Validator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work NF-e Validator owners hand off.

This MCP is built for professionals handling Brazilian tax documentation and financial data entry.

  • 01

    Accountants

    Hand off bulk NF-e key verification to your agent to ensure data accuracy.

  • 02

    Tax Analysts

    Use the agent to audit business compliance for large batches of electronic invoices.

  • 03

    Logistics Coordinators

    Verify invoice keys quickly to keep shipping documentation in order.

FAQ

Questions NF-e Validator owners ask.

  • 01

    What does this MCP actually do?

    It validates the structure and compliance of Brazilian NF-e access keys using mathematical algorithms and tax standards.

  • 02

    How does it check if a key is valid?

    It uses the Modulo 11 algorithm to verify the 44-digit sequence's mathematical integrity.

  • 03

    Can I use this with Claude or Cursor?

    Yes, you can connect this MCP to any compatible client including Claude, Cursor, and Windsurf.

  • 04

    Do I need to host the MCP myself?

    No, Vinkius hosts and manages the MCP for you, so it is ready to use immediately after connection.

  • 05

    What kind of data can be extracted from a key?

    The MCP can extract metadata such as CNPJ, State Code, Model, Series, and Number.

  • 06

    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.

  • 07

    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.

  • 08

    Does this capability check for tax compliance?

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

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