Causa Prima

Causa Prima is an AI-native fintech building an agent-to-agent network for finance teams — automating invoicing, dispute resolution, and dynamic (early-payment) discounting between buyers and suppliers. Its first public product, Scribo, is a free, EN 16931-compliant e-invoicing engine that generates German ZUGFeRD and XRechnung, plus plain US PDF invoices, through five surfaces: a web UI, an HTTP API, a hosted MCP server, an npm CLI, and a Claude / ChatGPT / Codex Agent Skill — all backed by the same public /api/v1 API with no signup (the sender's email is the login via a magic link). The team previously built Taulia (acquired by SAP) and Finoa; Causa Prima is backed by Creandum.

Causa Prima publishes 3 APIs on the APIs.io network: Invoices API, Jurisdictions API, and Scribo API. Tagged areas include Company, Artificial Intelligence, Fintech, E-Invoicing, and Invoicing.

Causa Prima’s developer surface includes documentation, API reference, getting-started guide, CLI, authentication, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.6/100 developing ▬ flat Agent 47/100 agent native saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessOpen

1 APIs 1 MCP Servers

Company Artificial Intelligence Fintech E-Invoicing Invoicing Payments Compliance GermanyEN 16931Agents MCP

Kin Score

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

Composite quality — 42.6/100 · developing

Contract Quality 9.3 / 19

Developer Ergonomics 9.6 / 15

Access Clarity 4.3 / 15

Operational Transparency 0.3 / 10

Contract Governance 1.6 / 9

Discoverability 5.7 / 8

Regulatory Posture 7.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 47/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/causa-prima: 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 →

APIs 3

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

Causa Prima Invoices API

The Invoices API from Causa Prima — 3 operation(s) for invoices.

Causa Prima Jurisdictions API

The Jurisdictions API from Causa Prima — 1 operation(s) for jurisdictions.

Causa Prima Scribo API

The Scribo API from Causa Prima — 4 operation(s) for scribo.

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Scribo Invoice Invoices API

OPEN COLLECTION

Scribo Invoice Invoices Jurisdictions API

OPEN COLLECTION

Invoice Invoices Scribo API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Causa Prima MCP Server

Hosted Scribo MCP server for free EN 16931-compliant e-invoice generation. Compatible with Claude Desktop/Claude.ai (custom connector), Cursor, Cline, ChatGPT App, and OpenAI Co...

MCP SERVER

Security Posture 2

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

Causa Prima Authentication

http · 1 scheme

SECURITY

Causa Prima Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Causa Prima Agentic Access

8 operations · 3 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

AgentSkill

AgenticAccess

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Idempotency

DataModel

Conformance

Lifecycle

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

CLI

CLI

Access & Security 3

Authentication, authorization, and security posture

Compliance

Compliance

DomainSecurity

DomainSecurity

Authentication

Authentication

Commercial 2

Pricing, plans, and the legal terms of use

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

ParentCompany

ParentCompany

Overlay

Overlay

Source (apis.yml)

aid: causa-prima
name: Causa Prima
description: 'Causa Prima is an AI-native fintech building an agent-to-agent network for finance teams — automating invoicing,
  dispute resolution, and dynamic (early-payment) discounting between buyers and suppliers. Its first public product, Scribo,
  is a free, EN 16931-compliant e-invoicing engine that generates German ZUGFeRD and XRechnung, plus plain US PDF invoices,
  through five surfaces: a web UI, an HTTP API, a hosted MCP server, an npm CLI, and a Claude / ChatGPT / Codex Agent Skill
  — all backed by the same public /api/v1 API with no signup (the sender''s email is the login via a magic link). The team
  previously built Taulia (acquired by SAP) and Finoa; Causa Prima is backed by Creandum.'
url: https://raw.githubusercontent.com/api-evangelist/causa-prima/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- creandum
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  label: Open access
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://causaprima.ai/og-image.jpg
tags:
- Company
- Artificial Intelligence
- Fintech
- E-Invoicing
- Invoicing
- Payments
- Compliance
- Germany
- EN 16931
- Agents
- MCP
tags_raw:
- Company
- AI
- Fintech
- E-Invoicing
- Invoicing
- Payments
- Compliance
- Germany
- EN 16931
- Agents
- MCP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: causa-prima:causa-prima-invoices-api
  name: Causa Prima Invoices API
  description: The Invoices API from Causa Prima — 3 operation(s) for invoices.
  humanURL: https://scribo.causaprima.ai/docs/api
  baseURL: https://scribo.causaprima.ai
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/causa-prima-invoices-api-openapi.yml
  - type: Documentation
    url: https://scribo.causaprima.ai/docs
  - type: APIReference
    url: https://scribo.causaprima.ai/docs/api
- aid: causa-prima:causa-prima-jurisdictions-api
  name: Causa Prima Jurisdictions API
  description: The Jurisdictions API from Causa Prima — 1 operation(s) for jurisdictions.
  humanURL: https://scribo.causaprima.ai/docs/api
  baseURL: https://scribo.causaprima.ai
  tags:
  - Jurisdictions
  properties:
  - type: OpenAPI
    url: openapi/causa-prima-jurisdictions-api-openapi.yml
  - type: Documentation
    url: https://scribo.causaprima.ai/docs
  - type: APIReference
    url: https://scribo.causaprima.ai/docs/api
- aid: causa-prima:causa-prima-scribo-api
  name: Causa Prima Scribo API
  description: The Scribo API from Causa Prima — 4 operation(s) for scribo.
  humanURL: https://scribo.causaprima.ai/docs/api
  baseURL: https://scribo.causaprima.ai
  tags:
  - Scribo
  properties:
  - type: OpenAPI
    url: openapi/causa-prima-scribo-api-openapi.yml
  - type: Documentation
    url: https://scribo.causaprima.ai/docs
  - type: APIReference
    url: https://scribo.causaprima.ai/docs/api
common:
- type: ParentCompany
  url: https://apis.io/providers/sap/
  name: SAP
  x-relationship: acquired
  x-evidence: The team previously built Taulia (acquired by SAP) and Finoa; Causa Prima is backed by Creandum.
- type: Website
  url: https://causaprima.ai/
- type: DeveloperPortal
  url: https://scribo.causaprima.ai/docs
- type: Documentation
  url: https://scribo.causaprima.ai/docs
- type: APIReference
  url: https://scribo.causaprima.ai/docs/api
- type: GettingStarted
  url: https://scribo.causaprima.ai/getting-started
- type: GitHubOrganization
  url: https://github.com/causa-prima-ai
- type: TermsOfService
  url: https://causaprima.ai/terms
- type: PrivacyPolicy
  url: https://causaprima.ai/privacy
- type: Compliance
  url: https://scribo.causaprima.ai/compliance
- type: OpenAPI
  url: openapi/_original/causa-prima-scribo-openapi.json
- type: LLMsTxt
  url: llms/causa-prima-llms.txt
- type: MCPServer
  url: mcp/causa-prima-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Packages
  url: packages/causa-prima-packages.yml
- type: CLI
  url: cli/causa-prima-cli.yml
- type: ErrorCatalog
  url: errors/causa-prima-problem-types.yml
- type: Conventions
  url: conventions/causa-prima-conventions.yml
- type: Idempotency
  url: conventions/causa-prima-conventions.yml
- type: DataModel
  url: data-model/causa-prima-data-model.yml
- type: Conformance
  url: conformance/causa-prima-conformance.yml
- type: Lifecycle
  url: lifecycle/causa-prima-lifecycle.yml
- type: Overlay
  url: overlays/causa-prima-scribo-overlay.yaml
- type: DomainSecurity
  url: security/causa-prima-domain-security.yml
- type: AgenticAccess
  url: agentic-access/causa-prima-agentic-access.yml
- type: Authentication
  url: authentication/causa-prima-authentication.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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