invowerk

invowerk provides a free API to validate and convert PDF invoices into e‑invoices (ZUGFeRD, Factur‑X, XRechnung, Peppol). It offers PDF upload, email submission, and direct conversion, preserving the original layout while ensuring compliance with German and EU standards. The service runs on German servers, processes invoices in memory, and discards data after use. Developed by Michael Sann, invowerk is aimed at software manufacturers and tax consultants seeking automated invoice validation and conversion.

invowerk publishes 6 API contracts indexed on the APIs.io network, including Account API, Generation API, Rendering API, and 3 more. Tagged areas include Invoicing, e-invoice, PDF, and Germany.

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

invowerk’s developer surface includes signup flow, authentication, documentation, pricing, support, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

44.2/100 developing Agent 29/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 Agent Skills

Invoicing e-invoice PDF Germany

Kin Score

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

Composite quality — 44.2/100 · developing

Contract Quality 13.4 / 21

Developer Ergonomics 4.8 / 17

Access Clarity 10.5 / 17

Operational Transparency 0.0 / 11

Contract Governance 3.6 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 29/100 · agent ready

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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 5 / 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 →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document 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):

Developer Ergonomics scores 28.0 — up to +14.4 composite points Ask about this →
Operational Transparency scores 0.0 — up to +13.0 composite points Ask about this →
Contract Quality scores 63.1 — up to +9.2 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/invowerk-dev/apis.yml: open an issue on github.com/api-evangelist/invowerk-dev 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 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

invowerk Account API

Check your plan, your remaining requests and credits, and what your plan includes. `GET /v1/me` is always free.

invowerk Generation API

The Generation API from invowerk — 1 operation(s) for generation.

invowerk Rendering API

The Rendering API from invowerk — 1 operation(s) for rendering.

invowerk Rules API

The Rules API from invowerk — 1 operation(s) for rules.

invowerk Transform API

The Transform API from invowerk — 2 operation(s) for transform.

invowerk Validation API

The Validation API from invowerk — 1 operation(s) for validation.

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

invowerk-dev-transform-invoice

AGENT SKILL

invowerk API pricing

Prices published by invowerk, read 2026-11-12 from invowerk.dev/pricing.

Plan	Price
Kostenlos	0 € pro Monat
Essential	29 € pro Monat
Scale	79 € pro Monat
10 E‑Rechnungen erstellen	9,90 €

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

invowerk Plans Pricing

4 plans

PLANS

Semantic Vocabularies 1

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

Invowerk Dev Context

33 classes · 130 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.

invowerk API Rules

57 rules · 51 error-severity 3 warn-severity 3 info-severity

SPECTRAL

JSON Schema 6

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

ConvertResponse

3 properties

JSON SCHEMA

GenerateRequest

25 properties

JSON SCHEMA

MeResponse

5 properties

JSON SCHEMA

ParseResponse

3 properties

JSON SCHEMA

RenderResponse

4 properties

JSON SCHEMA

ValidationResponse

15 properties

JSON SCHEMA

Security Posture 2

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

invowerk Authentication

apiKey · 1 scheme

SECURITY

invowerk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

invowerk Agentic Access

7 operations · 4 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

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

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

About

About

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: invowerk-dev
name: invowerk
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://invowerk.dev/app-static/brand/og.png
description: invowerk provides a free API to validate and convert PDF invoices into e‑invoices (ZUGFeRD, Factur‑X, XRechnung,
  Peppol). It offers PDF upload, email submission, and direct conversion, preserving the original layout while ensuring compliance
  with German and EU standards. The service runs on German servers, processes invoices in memory, and discards data after
  use. Developed by Michael Sann, invowerk is aimed at software manufacturers and tax consultants seeking automated invoice
  validation and conversion.
url: https://artifacts.apis.io/invowerk-dev/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-12 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-12'
modified: '2026-11-12'
tags:
- Invoicing
- e-invoice
- PDF
- Germany
tags_raw:
- invoicing
- e-invoice
- PDF
- API
- Germany
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/invowerk-dev-agentic-access.yml
- type: Plans
  url: plans/invowerk-dev-plans-pricing.yml
- type: Spectral
  url: rules/invowerk-dev-rules.yml
- type: JSONLD
  url: json-ld/invowerk-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/invowerk-dev-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/invowerk-dev-data-model.yml
- type: ErrorCatalog
  url: errors/invowerk-dev-problem-types.yml
- type: Conformance
  url: conformance/invowerk-dev-conformance.yml
- type: LLMsTxt
  url: llms/invowerk-dev-llms.txt
- type: WellKnown
  url: well-known/invowerk-dev-well-known.yml
- type: Hosts
  url: hosts/invowerk-dev-hosts.yml
- type: SignUp
  url: https://invowerk.dev/auth/register?ref=nav-signup
- type: Authentication
  url: authentication/invowerk-dev-authentication.yml
- type: DomainSecurity
  url: security/invowerk-dev-domain-security.yml
- type: Website
  url: https://invowerk.dev/
- type: Documentation
  url: https://invowerk.dev/docs
- type: Pricing
  url: https://invowerk.dev/pricing
- type: TermsOfService
  url: https://invowerk.dev/terms
- type: PrivacyPolicy
  url: https://invowerk.dev/privacy
- type: Support
  url: https://invowerk.dev/support
- type: About
  url: https://invowerk.dev/about
apis:
- aid: invowerk-dev:invowerk-dev-account-api
  name: invowerk Account API
  description: Check your plan, your remaining requests and credits, and what your plan includes. `GET /v1/me` is always free.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/invowerk-dev-me-response-schema.json
- aid: invowerk-dev:invowerk-dev-generation-api
  name: invowerk Generation API
  description: The Generation API from invowerk — 1 operation(s) for generation.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Generation
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-generation-api-openapi.yml
  - type: JSONSchema
    url: json-schema/invowerk-dev-generate-request-schema.json
- aid: invowerk-dev:invowerk-dev-rendering-api
  name: invowerk Rendering API
  description: The Rendering API from invowerk — 1 operation(s) for rendering.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Rendering
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-rendering-api-openapi.yml
  - type: JSONSchema
    url: json-schema/invowerk-dev-render-response-schema.json
- aid: invowerk-dev:invowerk-dev-rules-api
  name: invowerk Rules API
  description: The Rules API from invowerk — 1 operation(s) for rules.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Rules
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-rules-api-openapi.yml
- aid: invowerk-dev:invowerk-dev-transform-api
  name: invowerk Transform API
  description: The Transform API from invowerk — 2 operation(s) for transform.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Transforms
  tags_raw:
  - Transform
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-transform-api-openapi.yml
  - type: JSONSchema
    url: json-schema/invowerk-dev-parse-response-schema.json
  - type: JSONSchema
    url: json-schema/invowerk-dev-convert-response-schema.json
- aid: invowerk-dev:invowerk-dev-validation-api
  name: invowerk Validation API
  description: The Validation API from invowerk — 1 operation(s) for validation.
  humanURL: https://invowerk.dev/docs
  baseURL: https://api.invowerk.dev
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/invowerk-dev-validation-api-openapi.yml
  - type: JSONSchema
    url: json-schema/invowerk-dev-validation-response-schema.json
x-enrichment:
  date: '2026-11-12'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

invowerk API — frequently asked questions

Does invowerk have an API?

Yes. APIs.io lists 6 APIs from invowerk, including invowerk Account API, invowerk Generation API and invowerk Rendering API, and 3 more.

Is there an OpenAPI specification for the invowerk API?

Yes. APIs.io indexes 6 OpenAPI specifications for invowerk, each linked for download from this page.

How do I authenticate with the invowerk API?

invowerk uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as invowerk Authentication.

How much does the invowerk API cost?

invowerk publishes its prices; its Kostenlos plan is 0 € pro Monat as of 2026-11-12. APIs.io lists 4 pricing plans for invowerk, with each plan's price, limits and inclusions under Pricing on this page.

Is the invowerk API ready for AI agents?

invowerk has a Kin Score of 44.2 out of 100 (developing) and an Agent Readiness score of 29.0 (agent-ready), scored by API Evangelist on 2026-11-13.

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