DDD Invoices

DDD Invoices is a unified e-invoicing, fiscalization, and real-time tax reporting compliance platform delivered as a single API. It lets software companies, ERPs, SaaS platforms, e-commerce systems, marketplaces, payment providers, and POS vendors issue, receive, and archive locally compliant invoices across 30+ countries without building country-specific tax integrations. The platform handles B2B and B2G e-invoicing over the PEPPOL network, national real-time reporting and fiscalization mandates, AI-assisted invoice document processing, and long-term compliant archival, exposing it all through one JSON API with test and production connection keys. Backed by 500 Global, it raised a USD 1.3M seed round.

DDD Invoices is listed with 1 API on the APIs.io network. Tagged areas include Company, E-Invoicing, Fiscalization, Tax Compliance, and Real-Time Reporting.

DDD Invoices’ developer surface includes documentation, API reference, quickstart, pricing, signup flow, engineering blog, support, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.1/100 thin ▬ flat Agent 3/100 human only Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 API

Company E-Invoicing Fiscalization Tax ComplianceReal-Time ReportingPEPPOL Invoicing

Kin Score

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

Composite quality — 33.1/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 9.3 / 17

Access Clarity 8.9 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 4.4 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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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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 github.com/api-evangelist/ddd-invoices: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
E-invoicing and Tax Compliance (certified operators)	undeclared	-	-	2
Stripe App Marketplace and Partner Ecosystem (builders on Stripe)	undeclared	-	-	2

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

Peppol

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

DDD Invoices EUeInvoices API

Single JSON API for issuing, receiving, and archiving locally compliant invoices — e-invoicing, PEPPOL exchange, fiscalization, and real-time tax reporting across 30+ countries....

Security Posture 2

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

Ddd Invoices Authentication

apiKey · 1 scheme

SECURITY

Ddd Invoices Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

Quickstart

Quickstart

SignUp

SignUp

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Access & Security 3

Authentication, authorization, and security posture

Compliance

Compliance

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

SLA

SLA

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: ddd-invoices
name: DDD Invoices
description: DDD Invoices is a unified e-invoicing, fiscalization, and real-time tax reporting compliance platform delivered
  as a single API. It lets software companies, ERPs, SaaS platforms, e-commerce systems, marketplaces, payment providers,
  and POS vendors issue, receive, and archive locally compliant invoices across 30+ countries without building country-specific
  tax integrations. The platform handles B2B and B2G e-invoicing over the PEPPOL network, national real-time reporting and
  fiscalization mandates, AI-assisted invoice document processing, and long-term compliant archival, exposing it all through
  one JSON API with test and production connection keys. Backed by 500 Global, it raised a USD 1.3M seed round.
url: https://raw.githubusercontent.com/api-evangelist/ddd-invoices/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://dddinvoices.com/og/default.png
tags:
- Company
- E-Invoicing
- Fiscalization
- Tax Compliance
- Real-Time Reporting
- PEPPOL
- Invoicing
tags_raw:
- Company
- e-Invoicing
- Fiscalization
- Tax Compliance
- Real-Time Reporting
- PEPPOL
- Invoicing
- API
apis:
- name: DDD Invoices EUeInvoices API
  description: Single JSON API for issuing, receiving, and archiving locally compliant invoices — e-invoicing, PEPPOL exchange,
    fiscalization, and real-time tax reporting across 30+ countries. Uses a custom IoT connection-key header for authentication
    with distinct TEST and PROD keys per legal entity.
  humanURL: https://dddinvoices.com/documentation-e-invoicing
  baseURL: https://app.dddinvoices.com/api/service/
  properties:
  - type: Documentation
    url: https://dddinvoices.com/documentation-e-invoicing
  - type: APIReference
    url: https://api.dddinvoices.com/public-api-playground
  - type: Authentication
    url: authentication/ddd-invoices-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://dddinvoices.com
- type: Documentation
  url: https://dddinvoices.com/documentation-e-invoicing
- type: APIReference
  url: https://api.dddinvoices.com/public-api-playground
- type: Quickstart
  url: https://dddinvoices.com/builders
- type: Pricing
  url: https://dddinvoices.com/pricing
- type: SignUp
  url: https://app.dddinvoices.com/sign-up
- type: Login
  url: https://app.dddinvoices.com/login
- type: TermsOfService
  url: https://dddinvoices.com/terms-and-conditions
- type: PrivacyPolicy
  url: https://dddinvoices.com/privacy-policy
- type: Blog
  url: https://dddinvoices.com/learn
- type: Support
  url: https://calendly.com/ddd-invoices/30min-intro
- type: SLA
  url: https://dddinvoices.com/service-support-level-agreements
- type: Compliance
  url: https://dddinvoices.com/data-processing
- type: LLMsTxt
  url: llms/ddd-invoices-llms.txt
- type: Authentication
  url: authentication/ddd-invoices-authentication.yml
- type: Conventions
  url: conventions/ddd-invoices-conventions.yml
- type: Sandbox
  url: sandbox/ddd-invoices-sandbox.yml
- type: X-MCPServerCandidate
  url: mcp/ddd-invoices-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Conformance
  url: conformance/ddd-invoices-conformance.yml
- type: DomainSecurity
  url: security/ddd-invoices-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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