Erechio

Erechio provides a free REST API for validating German e‑invoices according to XRechnung and ZUGFeRD standards, using the official KoSIT rules. Users can upload invoices via the browser or API, receive detailed error explanations in German, and test up to 50 documents per month without payment. The service is hosted in Nürnberg, Germany, and offers a public endpoint at https://api.erechio.de. An English quickstart is at https://erechio.de/en/api.html; the German docs are the full reference. The free test key (50 documents per month) is open to everyone; paid plans are for businesses based in Germany.

Erechio publishes 2 API contracts indexed on the APIs.io network: Prüfen API and Status API. Tagged areas include German, e-invoice, Validation, XRechnung, and ZUGFeRD.

The Erechio catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Erechio’s developer surface includes getting-started guide, authentication, documentation, pricing, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.2/100 thin Agent 28/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract

German e-invoice Validation XRechnung ZUGFeRDKoSIT

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 39.2/100 · thin

Contract Quality 13.4 / 21

Developer Ergonomics 5.7 / 17

Access Clarity 4.3 / 17

Operational Transparency 1.6 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 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

MCP Tool Quality 6 / 6

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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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Developer Ergonomics scores 33.3 — up to +13.3 composite points Ask about this →
Operational Transparency scores 14.3 — up to +11.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/erechio/apis.yml: open an issue on github.com/api-evangelist/erechio to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Erechio Prüfen API

E-Rechnung prüfen

Erechio Status API

Zustand des Dienstes

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Erechio Context

7 classes · 38 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Erechio API Rules

57 rules · 55 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Ergebnis

18 properties

JSON SCHEMA

Status

6 properties

JSON SCHEMA

Security Posture 2

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

Erechio Authentication

apiKey/http · 2 schemes

SECURITY

Erechio Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Erechio Agentic Access

2 operations

2 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Imprint

Imprint

Source (apis.yml)

aid: erechio
name: Erechio
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://erechio.de/assets/og/start.png
description: 'Erechio provides a free REST API for validating German e‑invoices according to XRechnung and ZUGFeRD standards,
  using the official KoSIT rules. Users can upload invoices via the browser or API, receive detailed error explanations in
  German, and test up to 50 documents per month without payment. The service is hosted in Nürnberg, Germany, and offers a
  public endpoint at https://api.erechio.de. An English quickstart is at https://erechio.de/en/api.html; the German docs are
  the full reference. The free test key (50 documents per month) is open to everyone; paid plans are for businesses based
  in Germany.

  '
url: https://artifacts.apis.io/erechio/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-10 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-10'
modified: '2026-11-11'
tags:
- German
- e-invoice
- Validation
- XRechnung
- ZUGFeRD
- KoSIT
tags_raw:
- German
- e-invoice
- validation
- XRechnung
- ZUGFeRD
- KoSIT
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: GettingStarted
  url: https://erechio.de/en/api.html
  x-language: en
- type: AgenticAccess
  url: agentic-access/erechio-agentic-access.yml
- type: Spectral
  url: rules/erechio-rules.yml
- type: JSONLD
  url: json-ld/erechio-context.jsonld
- type: Vocabulary
  url: vocabulary/erechio-vocabulary.yml
- type: DataModel
  url: data-model/erechio-data-model.yml
- type: ErrorCatalog
  url: errors/erechio-problem-types.yml
- type: Conformance
  url: conformance/erechio-conformance.yml
- type: Hosts
  url: hosts/erechio-hosts.yml
- type: Authentication
  url: authentication/erechio-authentication.yml
- type: DomainSecurity
  url: security/erechio-domain-security.yml
- type: Website
  url: https://erechio.de
- type: Documentation
  url: https://erechio.de/api/openapi.json
- type: Documentation
  url: https://erechio.de/api/einstieg.html
- type: GettingStarted
  url: https://erechio.de/api/einstieg.html
- type: Pricing
  url: https://erechio.de/api/
- type: StatusPage
  url: https://erechio.de/status.html
- type: TermsOfService
  url: https://erechio.de/agb.html
- type: PrivacyPolicy
  url: https://erechio.de/datenschutz.html
- type: Imprint
  url: https://erechio.de/impressum.html
apis:
- aid: erechio:erechio-pr-fen-api
  name: Erechio Prüfen API
  description: E-Rechnung prüfen
  humanURL: https://erechio.de/api/
  baseURL: https://api.erechio.de
  tags:
  - Prüfen
  properties:
  - type: OpenAPI
    url: openapi/erechio-pr-fen-api-openapi.yml
  - type: JSONSchema
    url: json-schema/erechio-ergebnis-schema.json
  - type: JSONSchema
    url: json-schema/erechio-status-schema.json
- aid: erechio:erechio-status-api
  name: Erechio Status API
  description: Zustand des Dienstes
  humanURL: https://erechio.de/api/
  baseURL: https://api.erechio.de
  tags:
  - Status
  properties:
  - type: OpenAPI
    url: openapi/erechio-status-api-openapi.yml
  - type: JSONSchema
    url: json-schema/erechio-ergebnis-schema.json
  - type: JSONSchema
    url: json-schema/erechio-status-schema.json
x-submission-notes: 'German e-invoice validation (XRechnung/ZUGFeRD, KoSIT rules). Docs https://erechio.de/api/ (German).
  Free test key 50 docs/mo; paid 14 EUR/mo. Re-queued 2026-11-10: the 10-18 queue row never reached origin. Do not add contact
  to newsletter.'
x-submission-probe: root 200; openapi.json 200 (OpenAPI 3.1, 12.8KB); soft-404 ok; base URL not public yet (sent with key)
x-enrichment:
  date: '2026-11-10'
  status: enriched
  artifacts_added: 18
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Erechio API — frequently asked questions

Does Erechio have an API?

Yes. APIs.io lists 2 APIs from Erechio, including Erechio Prüfen API and Erechio Status API.

Is there an OpenAPI specification for the Erechio API?

Yes. APIs.io indexes 2 OpenAPI specifications for Erechio, each linked for download from this page.

How do I authenticate with the Erechio API?

Erechio uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Erechio Authentication.

Is the Erechio API ready for AI agents?

Erechio has a Kin Score of 39.2 out of 100 (thin) and an Agent Readiness score of 28.1 (agent-aware), scored by API Evangelist on 2026-11-13.

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