Manage certified Portuguese billing in plain conversation. 
Claude 
ChatGPT 
Cursor 
Gemini 
Windsurf 
VS Code 
JetBrains 
Vercel
Gemini Works with every AI agent you already use
…and any MCP-compatible client
Connect to your AI in seconds.
InvoiceXpress MCP manages your certified billing and client records for Portugal through natural conversation. You can create new clients, track outstanding payments, list invoices, and audit tax rates without logging into multiple portals.
It handles the entire invoicing lifecycle—from initial estimate to final receipt.
What your AI can do
List clients
Lists every client registered in InvoiceXpress for an overview.
Get client
Retrieves all detailed demographic and contact information for a specific, known client ID.
Find client
Searches for an existing client using their company name.
Find specific clients by name, retrieve their full fiscal details, or register entirely new accounts.
List all issued invoices and receipts, retrieving detailed line items, tax breakdowns, and the final PDF links for sharing.
View a complete list of estimates and pro-forma invoices to monitor pending business proposals before they become active billing cycles.
Audit current VAT rates, exemptions, and official tax codes required by Portuguese law (AT).
Manage your list of billable items or services, including their unit prices and associated IVA tax rates.
Ask an AI about this
Compatible AI Apps
OAuth 2.0 Compatible Gemini Waiting for input…
InvoiceXpress (Online Invoicing) with 16 Tools
These tools allow you to manage every aspect of your Portuguese billing cycle—from creating clients to auditing tax rates.
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 InvoiceXpress (Online Invoicing) on VinkiusList Clients
Lists every client registered in InvoiceXpress for an overview.
Get Client
Retrieves all detailed demographic and contact information for a specific, known...
Find Client
Searches for an existing client using their company name.
Create Client
Registers a new customer in InvoiceXpress using their full fiscal details.
Update Client
Modifies demographic details for a client without changing the core ID or history.
List Items
Provides a list of every item or service currently set up for billing.
Get Item
Retrieves all specific details about a service or article by its ID number.
Create Item
Adds a new service or product to your billing catalog, linking it to the necessary...
List Invoices
Lists all invoices that have been issued in the system.
Get Invoice
Pulls every detail from an invoice record, including the PDF link and tax breakdown.
List Estimates
Lists all current and past estimates, helping you track potential sales revenue.
List Credit Notes
Retrieves a list of all recorded credit notes, used for returns or adjustments.
List Receipts
Lists all payment receipts received from clients, confirming funds have arrived.
List Guides
Retrieves a list of transport guides relevant to your operations.
List Taxes
Lists all currently active VAT rates and tax exemptions configured in your account.
List Sequences
Shows the active numbering series for invoices (e.g., FT 2026/).
Connect to your AI in seconds. 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
Open Claude Settings
Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
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.
Start a conversation
Open a new chat. The InvoiceXpress 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
- Create Agent Skills with progressive disclosure
- Deploy to edge with MCPFusion framework
- Built in DLP, auth, and compliance on every call
- Real time usage dashboard and cost metering
- Publish to catalog or keep private
Make Your AI Do More
Start with InvoiceXpress (Online Invoicing), then connect any of our 5,000+ other servers whenever your AI needs more. One click, no limits.
- Use this MCP plus 5,000+ 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
Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by InvoiceXpress. 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.
VINKIUS INFRASTRUCTURE
Cloud Hosted
Managed infra
V8 Isolated
Sandboxed per request
Zero-Trust Proxy
No stored credentials
DLP Enforced
Policy on every call
GDPR Compliant
EU data residency
Token Compression
~60% cost reduction
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 16 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.
The accounting team spends hours just gathering data points.
Right now, managing client financials means logging into the invoicing platform, then opening a separate CRM tab, and often pulling reports to Excel. If you need to know the total outstanding amount for a specific client, you might have to manually check their profile, list all invoices, cross-reference payment receipts, and finally verify that the current tax codes are correct.
With this MCP, your agent handles the sequence of actions automatically. You just ask: 'What is TechPorto's outstanding balance?' The system runs find_client, then lists_invoices, checks list_receipts, and gives you one concise answer. It takes minutes of clicking down to seconds.
You get full control over the invoice lifecycle with InvoiceXpress.
The ability to run list_estimates means you can monitor your sales pipeline before it hits the billing stage. If a client's details are wrong, running get_client or find_client immediately flags the issue so you can update_client before sending anything out.
Everything is integrated into natural conversation. You don't need to learn a new interface for every task; you just talk to your AI agent and it executes the necessary actions.
What your AI can actually do with this
This connector lets you take full control of your certified accounting processes in Portugal using just plain language. Instead of jumping through multiple tabs or exporting CSVs to cross-reference data, you talk to your AI client and it performs the necessary actions within InvoiceXpress. You can list all registered clients by name, pull up detailed invoice breakdowns, or even check if your item catalog has the right VAT rates applied.
It’s built specifically for Portuguese compliance (NIF/NIPC). If you use Vinkius to connect this MCP alongside other business tools, you get a single source of truth for both billing and client management. You can audit estimates, view payment receipts, or list all active tax codes—all from one place.
019d75bb-63dc-72c0-b274-7edf90dbdb07 
Here's how it actually works
The bottom line is that your AI client acts as an automated accounting assistant inside InvoiceXpress.
First, subscribe to this MCP in Vinkius and provide your InvoiceXpress Account Name and API Key.
Next, you tell your AI client exactly what data you need—for instance, 'Show me the outstanding invoices for TechPorto.'
Finally, the agent uses the appropriate tools to pull all necessary records (invoices, clients, tax codes) and presents a summarized answer to you.
Who is this actually for?
Small business owners who manage invoicing themselves, or operations teams drowning in manual data lookups. You're the person tired of logging into a billing portal just to check if three invoices are paid and what the current VAT rate is.
You need to generate an invoice PDF for a client without leaving your main development environment. You ask, and it finds the document.
You audit monthly compliance records, ensuring that all invoices correctly map to active tax rates (IVA) before sending them to accounting.
You check client balances and outstanding estimates across the entire system to understand your cash flow without running manual reports.
What Changes When You Connect
Never lose track of outstanding payments. You can use the list_invoices tool to pull up all issued invoices and check client balances instantly.
Compliance is handled automatically. By using list_taxes, you ensure every invoice item maps correctly against active tax rates (IVA), protecting you from audit issues.
Client setup is fast. If you need a new customer, the create_client tool handles all fiscal data collection and registration in one go.
Keep track of potential revenue with ease. You can list_estimates to see which proposals are pending without needing to wait for them to become full invoices.
Streamline document access. Need proof of payment or a detailed bill? The get_invoice tool pulls all the required data and links to the final PDF.
See it in action
Need to send an invoice for last quarter's work.
The agent runs list_invoices to find all documents from Q3. You then ask it to get_invoice on the specific IDs, which pulls the full details and the PDF link so you can email them immediately.
Onboarding a new retainer client.
The agent uses find_client first to verify their existing record. If they don't exist, it runs create_client using their NIF/NIPC and then lists_items to set up the initial billing rates.
Auditing tax changes for an international project.
You run list_taxes to see all current IVA rules. Then, you use get_item on your product catalog details to confirm that every line item is mapped against the correct exemption code.
Checking if a client's details are up to date.
You find the client using find_client. If their address changed, you can run update_client with the new data to make sure future invoices are accurate.
The honest tradeoffs
Copying IDs from PDFs.
Opening a PDF invoice, manually copying the client ID (e.g., 12345), and pasting it into a separate system to check status.
Just tell your agent to get_client by name or list_clients for an overview. It pulls all necessary details without you needing to copy anything.
Assuming tax rates are the same yearly.
Billing a client using old VAT knowledge, resulting in non-compliant invoices because local tax law changed last month.
Always use list_taxes first. This ensures your billing is current and compliant with official AT tables.
Creating items without checking the catalog.
Trying to create a new billable service, but forgetting which tax ID or rate applies, causing downstream errors.
Before creating an item, use list_taxes and get_item to verify both the applicable VAT rates and current system IDs.
When It Fits, When It Doesn't
Use this MCP if your core business function revolves around certified billing, client tracking, or financial compliance within Portugal. Specifically, you need a single pane of glass to manage estimates (list_estimates) alongside realized revenue (list_invoices). Don't use it if you just need general CRM features, like tracking support tickets; for that, look at dedicated messaging connectors. You also don't need this if your process is purely cash-based and doesn't generate traceable invoices or tax records. If your main goal is internal inventory management unrelated to billing, an item catalog MCP would be better.
Questions you might have
How do I check active VAT rates using list_taxes? +
The list_taxes tool retrieves all current VAT rates and exemptions configured in your account. It provides the IDs you need to ensure accurate billing for every item.
Can I find a client by name using find_client? +
Yes, calling find_client searches the system for an existing customer based on their company's business name. It returns key identifiers like their fiscal ID.
How do I list all my invoices at once? Use list_invoices. +
The list_invoices tool pulls a comprehensive list of every invoice generated in the system, allowing you to track statuses and amounts quickly.
What if I need to add a new product to bill? +
You use create_item. The agent ensures that when you define the item, you also specify the required tax ID by referencing list_taxes first.
If I need to modify a client's details, how do I use the update_client function? +
The update_client tool only replaces the specific parameters you send. You don't risk overwriting existing data; it updates just the demographic fields or identifiers you provide.
How can I verify the details of a single article or service using get_item? +
You run get_item with the ID to pull all catalog information. This lets you confirm pricing, associated VAT rates (IVA), and availability before generating any documents.
I need to check my current sales pipeline; which tool lists outstanding quotes? Use list_estimates. +
Running list_estimates gives you a paginated view of all issued proposals. This lets your agent track pending business and see how close you are to converting estimates into final invoices.
After generating an invoice, what is the best way to retrieve the final PDF link? Use get_invoice. +
Calling get_invoice retrieves all document details, including a permalink for the signed PDF. This ensures you have the official, verifiable file needed for sharing or archiving.
Can I see the signed PDF of an invoice through my agent? +
Yes. Use the get_invoice tool with a specific Invoice ID. Your agent will return all document details along with a permalink to the signed PDF, allowing you to view or share the official fiscal document instantly.
How do I find a client by their company name? +
The find_client tool allows you to search for a client directly by their business name. This is perfect for locating a client profile when you don't have their numerical ID handy.
Can I list the VAT rates available in my account? +
Absolutely. Use the list_taxes tool to enumerate all VAT rates and exemptions configured in your InvoiceXpress account. Your agent will show the official AT mapping, which is essential before creating new items or invoices.
We've already built the connector for InvoiceXpress. Just plug in your AI agents and start using Vinkius.
No hosting. No infrastructure. No complex setup.
All 16 tools are live and waiting.
You're up and running in seconds.
Gemini Vinkius gives your AI agents access to the full catalog of app connectors, all fully managed, secure, and enterprise-ready. One subscription, every tool you need.
Built, hosted, and secured by Vinkius. You just connect and go.