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 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

45.6/100 developing ▬ flat Agent 61/100 agent native Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessOpen

3 APIs 1 MCP Servers

CompanyArtificial IntelligenceFintechE-InvoicingInvoicingPaymentsComplianceGermanyEN 16931AgentsMCP

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 45.6/100 · developing

Contract Quality 10.8 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 4.9 / 17

Operational Transparency 0.3 / 11

Contract Governance 3.1 / 10

Discoverability 6.9 / 9

Regulatory Posture 7.0 / 15

Agent readiness — 61/100 · 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

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.

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/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

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

MCP Servers 1

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

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 1

Properties that don't map to a standard resource type

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
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: 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

Causa Prima

Kin Score

APIs 3

Causa Prima Invoices API

Causa Prima Jurisdictions API

Causa Prima Scribo API

Open Collections 4

API Collection

Scribo Invoice Invoices API

Scribo Invoice Invoices Jurisdictions API

Invoice Invoices Scribo API

MCP Servers 1

Causa Prima MCP Server

Security Posture 2

Causa Prima Authentication

Causa Prima Domain Security

Agentic Access 1

Causa Prima Agentic Access

Resources