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Connect Vat Tax 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. Stop AI hallucinations from breaking your B2B tax compliance.

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 · 1 capability

We ship only the actions that matter.

Capability set01 / 01

01

1 capability in this set.

Part of 1 available through JS VAT.

  1. 01

    Validate vat

    The validate_vat capability performs offline mathematical validation against specific country formats. It checks the checksum of European and international VAT numbers to ensure they are structurally sound.

Real work

What teams actually run

01

Automated Invoicing

Your agent validates a client's VAT number before generating a new invoice in your billing system.

02

Vendor Onboarding

The agent checks the structural validity of a new supplier's Tax ID during the setup process.

03

Compliance Auditing

An agent runs through a list of existing tax IDs to flag any that fail mathematical checksums.

04

Contract Generation

The agent verifies corporate tax details before inserting them into a legal contract.

Automate a task

Put JS VAT 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

JS VAT 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 JS VAT 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

921ms average. Fast in production.

JS VAT is checked daily against the live service.

Daily averagePeak 1142ms
Oct 3Today
Fastest day
653ms
Slowest day
1142ms
14-day trend
Slowing+20%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 1 capability arrives 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 JS VAT, so you can see the experience inside your AI.

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

JS VAT Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_R2GmhYreLXbhdtOTpoumP5qeOFc4ejlazomdV4PZ/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 — JS VAT capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "vat-tax-validator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_R2GmhYreLXbhdtOTpoumP5qeOFc4ejlazomdV4PZ/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 JS VAT in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work JS VAT owners hand off.

This MCP is built for professionals handling cross-border B2B transactions and automated billing.

  • 01

    Accountants

    They hand off tax ID verification tasks to an agent to ensure invoice accuracy.

  • 02

    FinOps Engineers

    They use the MCP to build reliable, automated billing pipelines that don't fail due to bad data.

  • 03

    E-commerce Operators

    They use the capability to validate customer tax details during the checkout or onboarding process.

FAQ

Questions JS VAT owners ask.

  • 01

    Does this MCP check if a VAT number is currently active?

    No. This MCP performs structural and mathematical validation to ensure the number follows the correct format and checksum for its country.

  • 02

    Which AI clients can use this MCP?

    You can use this with any MCP-compatible client, including Claude, Cursor, Windsurf, and VS Code.

  • 03

    How does this prevent AI hallucinations?

    Instead of letting the LLM guess if a number looks right, the MCP uses hard-coded mathematical rules to verify the number's integrity.

  • 04

    Do I need to host this myself?

    No. Vinkius hosts and manages the MCP for you. You just connect your client and start using the capabilities.

  • 05

    Can it validate numbers outside of Europe?

    Yes, the capability supports both European VAT numbers and various international Tax ID formats.

  • 06

    Does it connect to VIES API?

    No, it checks the mathematical format (checksum) local. This guarantees sub-millisecond validation without network dependency.

  • 07

    Which countries are supported?

    All European Union member states (GB, DE, FR, IT, ES, etc).

  • 08

    Does it validate corporate names?

    No, it purely validates the mathematical format of the VAT number itself.

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