Causa Prima website screenshot

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, AI, 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
46.0/100 developing ▬ flat Agent 74/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessOpen
3 APIs 1 MCP Servers
CompanyAIFintechE-InvoicingInvoicingPaymentsComplianceGermanyEN 16931AgentsMCP

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 46.0/100 · developing
Contract Quality 12.7 / 25
Developer Ergonomics 13.5 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 74/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
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 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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.

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.

MCP Servers 1

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

causa-prima-mcp.yml

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

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
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 AgenticAccess
AgenticAccess

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 Idempotency
Idempotency
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
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)

apis.yml Raw ↑ 
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: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
image: https://causaprima.ai/og-image.jpg
tags:
- 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/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