E-Rechnung API (XRechnung & ZUGFeRD Validator)

The E‑Rechnung API provides a REST endpoint for validating German XRechnung (CII/UBL) and ZUGFeRD invoices against the official KoSIT Schematron rules. Users can POST an invoice file or PDF and receive JSON indicating validity, detected format, and detailed rule violations with IDs and German explanations. The service offers 50 free validations per month via an API key, with optional paid plans for higher volume.

E-Rechnung API (XRechnung & ZUGFeRD Validator) is listed with 1 API on the APIs.io network. Tagged areas include Company, Validation, German, Invoicing, and XRechnung.

The E-Rechnung API (XRechnung & ZUGFeRD Validator) catalog on APIs.io includes 1 Spectral governance ruleset.

E-Rechnung API (XRechnung & ZUGFeRD Validator)’s developer surface includes documentation and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

9.7/100 minimal Agent 2/100 human only Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 API

Company Validation German InvoicingXRechnungZUGFeRD

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 9.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.3 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 2/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

E-Rechnung API

Validate German XRechnung and ZUGFeRD invoices via REST.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

E-Rechnung API (XRechnung & ZUGFeRD Validator) API Rules

8 rules · 6 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Erechnung Konverter Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Erechnung Konverter Agentic Access

2 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: erechnung-konverter
name: E-Rechnung API (XRechnung & ZUGFeRD Validator)
description: The E‑Rechnung API provides a REST endpoint for validating German XRechnung (CII/UBL) and ZUGFeRD invoices against
  the official KoSIT Schematron rules. Users can POST an invoice file or PDF and receive JSON indicating validity, detected
  format, and detailed rule violations with IDs and German explanations. The service offers 50 free validations per month
  via an API key, with optional paid plans for higher volume.
url: https://raw.githubusercontent.com/api-evangelist/erechnung-konverter/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-20 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- Company
- Validation
- German
- Invoicing
- XRechnung
- ZUGFeRD
tags_raw:
- Company
- API
- Validation
- German
- Invoicing
- XRechnung
- ZUGFeRD
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/erechnung-konverter-agentic-access.yml
- type: Spectral
  url: rules/erechnung-konverter-rules.yml
- type: Conformance
  url: conformance/erechnung-konverter-conformance.yml
- type: Hosts
  url: hosts/erechnung-konverter-hosts.yml
- type: Vendors
  url: vendors/erechnung-konverter-vendors.yml
- type: DomainSecurity
  url: security/erechnung-konverter-domain-security.yml
- type: Website
  url: https://erechnung-konverter.vercel.app
- type: Documentation
  url: https://erechnung-konverter.vercel.app/e-rechnung-api
apis:
- name: E-Rechnung API
  description: Validate German XRechnung and ZUGFeRD invoices via REST.
  humanURL: https://erechnung-konverter.vercel.app/e-rechnung-api
  baseURL: https://erechnung-konverter.vercel.app
  aid: erechnung-konverter:e-rechnung-api
x-submission-notes: Free REST API validating XRechnung/ZUGFeRD e-invoices against KoSIT Schematron; API key; 50 free/month.
x-submission-probe: root 200; docs 200 (68KB); openapi.json 200 OpenAPI 3.1.0, 2 paths, server on own vercel host; soft-404
  404 (clean).
x-submitted-by: stoertebeker@mail.grokbot.com (apis.io/add, 2026-10-15)
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 11
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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