# E-Rechnung API (XRechnung & ZUGFeRD Validator)

**Canonical:** https://apis.io/providers/erechnung-konverter/  
**Website:** https://erechnung-konverter.vercel.app  
**APIs profiled:** 1

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.

## Kin Score — 9.7 / 100 (minimal)

Scored 2026-10-23 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 62.5 |
| Contract Quality | 0.0 |
| Contract Governance | 18.2 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 9.5 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 10.8 (matched via fallback).

## Agent readiness — 1.8 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |

## APIs (1)

- **E-Rechnung API** — Validate German XRechnung and ZUGFeRD invoices via REST.

## Agentic access (1)

- **Erechnung Konverter Agentic Access** — 2 operations · 2 acting

## Security (1)

- **Erechnung Konverter Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Validation, German, Invoicing, XRechnung, ZUGFeRD

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/erechnung-konverter/). Scores are computed from the provider's own public artifacts under a published rubric.