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 publishes 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 📡 Source on GitHub

31.3/100 thin ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company E-Invoicing Fiscalization Tax ComplianceReal-Time ReportingPEPPOL Invoicing

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 31.3/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 11.0 / 20

Access Clarity 10.5 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.2 / 12

Discoverability 7.6 / 10

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

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.

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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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