The invowerk MCP server,
connected in one click.
E-invoice checker for ZUGFeRD, Factur-X, XRechnung and Peppol BIS. Free web tool, API and MCP. Connect the official invowerk MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add invowerk to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http invowerk https://api.invowerk.dev/mcp/Run in your terminal, then restart Claude Code.
invowerk · https://api.invowerk.dev/mcp/
What your AI can do with invowerk
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “validate_invoice”: Check an e-invoice against EN 16931 and German rules. Input: `invoice_base64` is the base64 of an XML invoice (UBL or CII) or a ZUGFeRD / F.”
“Use “render_invoice”: Render an XML e-invoice (UBL or CII, e.g. XRechnung) as a readable HTML page. invowerk uses the KoSIT XRechnung visualization. Use it to sh.”
“Use “explain_errors”: Explain rule codes in plain language. Works without an API key. Covers the codes of `validate_invoice` findings and hints: EN 16931, XRechn.”
“Use “generate_invoice”: Create a valid EN 16931 e-invoice (UBL or CII XML) from JSON. Input: `invoice` is a JSON object keyed on EN 16931 Business Terms, the same.”
How secure is the invowerk MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how invowerk holds up.
Security grade B
gate scanned 6 tools on Oct 1, 2026. A few things are worth a look before you connect.
- mediumexplain_errors: References secrets or data exfiltration
Official endpoint
Operated by invowerk (invowerk.dev) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If invowerk adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick invowerk
Choose invowerk in the gate directory. No sign-in needed.
Use it anywhere
invowerk's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools invowerk exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
validate_invoice — Check an e-invoice against EN 16931 and German rules. Input: `invoice_base64` is the base64 of an XML invoice (UBL or CII) or a ZUGFeRD / F
render_invoice — Render an XML e-invoice (UBL or CII, e.g. XRechnung) as a readable HTML page. invowerk uses the KoSIT XRechnung visualization. Use it to sh
explain_errors — Explain rule codes in plain language. Works without an API key. Covers the codes of `validate_invoice` findings and hints: EN 16931, XRechn
generate_invoice — Create a valid EN 16931 e-invoice (UBL or CII XML) from JSON. Input: `invoice` is a JSON object keyed on EN 16931 Business Terms, the same
parse_invoice — Read an existing e-invoice into JSON keyed on EN 16931 Business Terms. The JSON is the input format of `generate_invoice`, so you can edit
convert_invoice — Convert an e-invoice to UBL or CII. The result is checked before it is returned. Input: `invoice_base64` is the base64 of an XML invoice or
Who runs the invowerk MCP server?
The invowerk MCP server at a glance
https://api.invowerk.dev/mcp/Questions, answered
Is there an official invowerk MCP server?
Yes — invowerk operates its own remote MCP server at api.invowerk.dev. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect invowerk to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick invowerk in the directory. No account or sign-in is needed. From then on, invowerk's tools are available in every client you've connected to gate.
Do I need to host anything?
No. invowerk runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the invowerk MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect invowerk in minutes. No credit card required.
Connect more than just invowerk
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up invowerk in: Claude · Claude Code · ChatGPT · Cursor · VS Code