invoice-api.xhub.io
E-invoicing in your product — via API
Creating, validating and reading e-invoices as a REST API — you embed the capability in your own software and ship compliance with it instead of building it yourself.
Foundation
- EN 16931 & KoSIT-validated
- 37 countries
- 14 formats
- Hosting in Germany
- 6 APIs – REST & JSON
- 99.9% uptime SLA (Premium+)
What partners use the API for
Four patterns we keep seeing in integration projects — anonymized.
SaaS platform
Embed the conversion and compliance core into your own solution: your users stay in your product, the e-invoicing logic comes from us.
System house & ERP
Generate XRechnung and ZUGFeRD straight from your own CRM or ERP — in your customers’ familiar letterhead layout.
No-code & automation
Workflows with n8n, Airtable or HubSpot: e-invoicing becomes a building block in existing automations.
Existing PDFs
Validate, parse and compliantly process the PDF invoices you already have — without breaking a grown process.
Six APIs — each usable on its own
Combine only what your use case needs. REST and JSON instead of SOAP and XML, SDKs for Node.js, Python and Go.
Produces PDF, XRechnung and ZUGFeRD for 37 countries from your structured invoice data.
Extracts structured data from incoming e-invoices.
Checks country-specific rules against EN 16931 and the official KoSIT Schematron validation — free, without a quota.
Overview of the supported formats and countries.
Converts between XRechnung, ZUGFeRD and Factur-X.
Embeds supporting documents, reports or T&Cs into the invoice as PDF/A-3 attachments.
Free tier including playground; the validator runs free of charge without a quota. Visualizer and Peppol connectivity are on the roadmap.
The partner model
For vendors who do not want to sell e-invoicing as a product but ship it as a feature.
- Embedded in your own product — embed or white-label
- Volume tiers for every additional end customer, without renegotiation
- Your own invoice templates and letterhead
- On-premise or hybrid operation possible
- Compliance assistance on formats and requirements
- Personal technical onboarding
Terms by volume — on request
We align operating model, volume tiers and onboarding in a call. Enterprise setups on request.
30 minutes, technical, no strings attached.
Three steps to a proof of concept
Verify first, talk second — in that order.
- Step 1
API key in 60 seconds
Create a free tier account and use the key right away — no credit card. Paid plans come with a 14-day trial.
Go to the console - Step 2
Feasibility check with your own sample invoices
Run the playground and quickstart docs against real documents from your own stock — generation, validation and parsing on the actual case.
Open the playground - Step 3
Partner call with a tiered offer
We clarify operating model, volume and onboarding — and you get an offer with volume tiers.
Let’s talk about your integration
We look at your use case and tell you how it maps onto the API.
Free tier, API key in 60 seconds — no credit card.