VAT ID validation and master data management in one workflow.
Automate VAT ID validation with full legal certainty, correct faulty master data directly and document every result in an audit-proof way. Without any IT project.
Companies that rely on Optimus.
From mid-sized companies to international corporations, finance, accounting and compliance teams rely on Optimus.
Optimus pays off immediately.
Minimize your tax risk, automate validation without project effort and save time on every run.
Avoid risk
A single contested VAT ID in a tax audit can cost you the tax exemption. The consequences are back payment of VAT, interest and possible fines. Optimus validates in a legally compliant way and stores an audit-proof record.
Start without project costs
No integration, no IT project. Web-based and ready to use immediately. You work semi-manually in the browser or fully automatically at your chosen interval, exactly as you need.
Save time and effort
Automated bulk validation instead of manual individual lookups, correction values applied directly, fewer returns. What used to take hours now runs automatically in the background.
One prevented error covers the cost.
What a single contested VAT ID can trigger, and how Optimus prevents it.
One contested invoice
Validated and documented in compliance with the law
One platform for legally certain VAT ID and master data validation.
Confirm with verifiable proof, monitor automatically, enrich data. This is how you avoid risk, save manual validation time and improve data quality permanently.
Qualified confirmation
Qualified confirmation of the VAT ID from the BZSt under § 18e UStG, including an intelligent notification whenever a qualified check is not possible or its requirements are not met.
Audit-proof record
A digitally signed PDF that documents the complete validation log as an attachment, audit-proof and GoBD-compliant.
Recurring validation
Validation at freely selectable intervals with audit-proof archiving of the results, including report delivery on request.
Email monitoring
Monitoring of all watched data at a freely selectable interval. You are notified specifically and only for invalid entries or concrete need for action.
No implementation required
Fully web-based and usable without an IT project: ready to use immediately. Simply upload your data via Excel or CSV and start the validation.
Intelligent enrichment
Optimus detects faulty company data and presents correction proposals in a direct comparison view.
The central functions up close.
The places where a manual lookup differs from an audit-proof process, with real views from the app.
Qualified confirmation directly from the official source.
Optimus delivers a legally certain, qualified confirmation directly from the official source, stores it in an audit-proof way, detects deviations and provides correction values for direct adoption.
- Legally certain, qualified confirmation under § 18e UStG
- Comparison of name, legal form and address from the official source
- A clear explanation whenever a qualified check is not possible or its requirements are not met
Correct faulty data in a direct comparison.
Optimus detects faulty company data, places the official values right next to yours and provides correction values that you apply individually or in bulk.
- Your data next to the official values in one view
- Apply correction values individually or in bulk
- Every change logged in an audit-proof way
A PDF that stands up to a tax audit.
Qualified digital signature according to IDW PS 880, eIDAS timestamp, embedded original data and BZSt log. GoBD-compliant and immediately archivable.
- Qualified signature (IDW PS 880) + eIDAS timestamp
- Archivable for 10 years in GoBD-compliant form
- Embedded original CSV and response log
Set up once, monitored permanently.
Store your master data once. Optimus revalidates automatically at the chosen interval. You are notified by email as soon as a VAT ID becomes invalid or an address changes.
- Recurring validation at your chosen interval
- Email notification for every deviation
- No manual tracking of deadlines
One detail becomes the complete record.
Enter a VAT ID and receive the complete company data. Or start with the company name and find the matching VAT ID including a match score.
The right function for every requirement.
Whether accounting, compliance or IT: we think the whole process through together. Instead of solving individual tasks in isolation, we deliver one continuous, holistic solution.
Qualified confirmation
§ 18e UStG · qualified BZSt request with name and address comparison
Audit-proof record
IDW PS 880 · eIDAS timestamp · 10 years GoBD-compliant
Recurring validation
Your chosen interval · fully automatic
Email monitoring
Proactive alerts for invalid IDs or address changes
Intelligent enrichment
Detects faulty company data · correction proposal in a comparison view
Lookup in both directions
Company data from the VAT ID · VAT ID from the company name
No implementation required
Fully web-based · no IT project · no maintenance
Automatic column detection
Detects columns on import automatically · no manual mapping
REST API, MCP and CLI
Complete programmatic access for developers and AI agents, integrated directly into your systems and workflows.
You decide how Optimus fits into your process.
Directly in the browser, deeply integrated into your systems, or automated via script and agent: Optimus fits in exactly the way that suits your operation.
Web app
Sign in in the browser, upload data, validate. No installation, with role and permission management for your whole team.
app.optimussoftware.deREST API
Embed validation and lookup directly into your ERP and your own applications. Documented with OpenAPI, with idempotency, webhooks and a sandbox for safe testing.
Open the API documentationOptimus CLI
Process files directly from the file system and communicate directly with the Optimus backend. Ideal for scripts, pipelines and recurring tasks.
CLI documentationMCP
Via the Model Context Protocol, language models and agents access validation and lookup in a structured way, as a native part of your AI-powered workflows.
Set up MCPIntegrated into every stack.
REST API, CLI and MCP embed validation and lookup wherever your processes run.
For our clients we embed the validation directly into SAP and Dynamics. The REST API is cleanly documented with OpenAPI, with idempotency and webhooks. The integration was done in a few days, with no surprises in production.
We process supplier master data nightly via scripts. The Optimus CLI accesses the file system directly and communicates with the backend. It plugged into our existing pipelines without any detours.
In our AI-powered accounting workflows the agent accesses validation and lookup directly via the Model Context Protocol. Optimus was one of the few solutions with native MCP support, which saved us a lot of in-house development.
Technology and integration partners
One VAT ID. All master data.
The VIES query only confirms the status, without company data. Optimus retrieves the complete, structured company data for direct adoption. For all EU countries, including Germany.
Countries we retrieve data for.
Optimus validates the VAT IDs of these countries and retrieves structured company and address data.
Detect deviations, correct them in seconds.
Optimus flags deviations and delivers the correct value right away. You apply it with one click. That saves you manual data research and a lot of time.
Find every validation run and record in seconds.
Full-text search across all validation reports and the data they contain. Type a company name and Optimus shows every report the company appeared in.
Imported in a few steps.
Upload or paste your data, columns are detected automatically, import. Then you start the validation.
Recurring validation without recurring effort.
Set it up once and it runs automatically. You choose the interval, the validation type and the notifications, exactly to your process.
100% hosted in Germany.
Your data resides exclusively in ISO 27001 certified data centers in Berlin and Munich. Full digital sovereignty, no transfers to third countries, no dependence on foreign cloud providers. No US Cloud Act.
Data that never leaves the country.
Data centers in Germany
Exclusively German infrastructure in ISO 27001 certified data centers in Berlin and Munich.
Encrypted throughout
Transfer and storage encrypted at all times, access controlled via roles and permissions.
Sign-in at the highest level
Secure sign-in with passkeys, one-time codes (OTP) and multi-factor authentication. For the API additionally access tokens with IP filtering.
What our customers report.
From mid-sized companies to tax firms: Optimus solves very different tasks in practice.
Before every invoice we validate the VAT ID and the freshness of the master data. Optimus detects deviations and delivers the correct value right away. That way we avoid returns, without any research of our own.
As a premium provider in international business we have to confirm every VAT ID with legal certainty. Optimus obtains the qualified confirmation from the BZSt and documents it traceably. That saves us noticeable time on every validation.
Due to our high export volume we have to validate VAT IDs continuously. Optimus checks our records automatically at the configured interval and alerts us as soon as master data changes. That saves us a lot of manual control.
With Optimus we offer our export-focused clients a reliable tool for the ongoing validation of VAT IDs as part of their compliance. Especially clients in the upper Mittelstand value the clean documentation.
We validate all new customers from neighboring Alsace with Optimus. Setup was quick, the product relieves our team and creates room for customer care. The advice and support are excellent.
We wanted to start immediately without an IT project. With Optimus we sign in in the browser, upload our data and validate directly. Exactly the simple solution we were looking for, it exceeded our expectations.
Optimus offers a modern, intuitive interface. With the daily, automated validation, the control of our VAT IDs runs reliably in the background.
Once a month we validate all outgoing invoices. We upload the data via Excel or CSV, Optimus detects the columns automatically and validates the entire set. It could not be easier to use.
What you want to know before you start.
Do I need a technical integration to get started?
Is the validation legally certain under § 18e UStG?
Where is my data stored?
How long can the records be archived?
Can I validate large data sets at once?
Can I try Optimus first?
Validate VAT IDs with legal certainty, keep master data clean.
Try Optimus for free. No installation, no IT project, ready to use immediately.