Validate EN 16931 e-invoices from your pipeline

France mandates structured invoice reception from September 2026; Germany already requires it. The official validators are manual uploads and Java tools you cannot put in CI. This is the missing API: XRechnung, EN 16931 UBL and CII, and Factur-X, with JSON errors that carry rule identifiers.

Get an API key Paste and validate

30 validations per month free. Files deleted within 24 hours, processed on EU soil.

CI usage

curl -s "$API/v1/validate?profile=xrechnung-3" \
  -H "Authorization: Bearer $EINV_KEY" \
  --data-binary @invoice.xml \
  | jq -e '.valid == true'

What it checks

Structure. Full XSD validation against the official OASIS UBL 2.1 and UN/CEFACT CII D16B schemas.
Core business rules. The EN 16931 mandatory fields, code lists, and totals arithmetic (BR, BR-CO families), computed with exact decimal arithmetic, answered synchronously.
Full schematron. The complete official EN 16931 and XRechnung rule sets run as a deep validation job; submit with deep=true and poll the job URL.

Every error carries the official rule identifier, a message, a location, and a link to the rule documentation page, so the response is the debugging session.

Pricing

Plan	Validations per month	Per month	Extras
Free	30	0 €	all validation profiles	Start free
Starter	300	9 €	all validation profiles	Subscribe
Pro	3000	29 €	generation endpoint	Subscribe
Business	15000	79 €	generation, Factur-X embed	Subscribe

Principles

Uploaded files are deleted within 24 hours; validation runs on our own hardware in the EU.
This is a developer tool, not tax advice, and not an archiving service.
We validate and generate; we are not a Peppol access point. Transmission belongs to your provider.
Rule sets are versioned; responses name the engine and artifacts that produced them.