inFakt

inFakt is a Polish fintech platform that combines invoicing software, online accounting, and dedicated bookkeeper services for sole proprietors (JDG), limited-liability companies (sp. z o.o.), foundations and other business types operating in Poland. Used by over 460,000 companies and headquartered in Kraków, inFakt offers a web app, iOS/Android mobile apps, deep KSeF (Poland's National e-Invoice System) integration, and a REST API (v3, JSON) for third-party integrations. The API exposes invoices, clients, products, costs, bank accounts, VAT exemptions, payment methods and business-activity data so e-commerce shops, CRMs and accounting tools can automate invoicing, cost booking and tax compliance. inFakt also publishes a hosted MCP server so AI agents can operate a company's accounting through Claude and other MCP clients.

inFakt publishes 1 API on the APIs.io network. Tagged areas include Company, Accounting, Invoicing, Fintech, and Bookkeeping.

The inFakt catalog on APIs.io includes 1 event-driven AsyncAPI specification.

inFakt’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.8/100 developing ▬ flat Agent 23/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs 1 MCP Servers

Company Accounting Invoicing Fintech Bookkeeping E-InvoicingKSeFTax Poland SMB

Kin Score

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

Composite quality — 46.8/100 · developing

Contract Quality 10.4 / 25

Developer Ergonomics 12.9 / 20

Access Clarity 8.9 / 20

Operational Transparency 6.5 / 13

Contract Governance 0.5 / 12

Discoverability 7.6 / 10

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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.

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/infakt: 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 1

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

inFakt API v3

inFakt's REST API (v3) for automating invoicing and accounting. Resources are addressed with a .json extension under /api/v3/ and authenticated with a per-account API key sent i...

MCP Servers 1

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

inFakt MCP

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Infakt Webhooks

ASYNCAPI

Security Posture 3

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

Infakt Authentication

apiKey · 1 scheme

SECURITY

Infakt Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Infakt Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

MCPServer

MCPServer

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

Access & Security 5

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Security

SecurityTxt

Authentication

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

ChangeLog

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: infakt
name: inFakt
description: inFakt is a Polish fintech platform that combines invoicing software, online accounting, and dedicated bookkeeper
  services for sole proprietors (JDG), limited-liability companies (sp. z o.o.), foundations and other business types operating
  in Poland. Used by over 460,000 companies and headquartered in Kraków, inFakt offers a web app, iOS/Android mobile apps,
  deep KSeF (Poland's National e-Invoice System) integration, and a REST API (v3, JSON) for third-party integrations. The
  API exposes invoices, clients, products, costs, bank accounts, VAT exemptions, payment methods and business-activity data
  so e-commerce shops, CRMs and accounting tools can automate invoicing, cost booking and tax compliance. inFakt also publishes
  a hosted MCP server so AI agents can operate a company's accounting through Claude and other MCP clients.
url: https://raw.githubusercontent.com/api-evangelist/infakt/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- point-nine
x-tier: profiled
x-tier-reason: enriched-from-public-api-surface
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: '2026-07-19'
image: https://www.infakt.pl/images/logo-infakt.png
tags:
- Company
- Accounting
- Invoicing
- Fintech
- Bookkeeping
- E-Invoicing
- KSeF
- Tax
- Poland
- SMB
tags_raw:
- Company
- Accounting
- Invoicing
- Fintech
- Bookkeeping
- e-Invoicing
- KSeF
- Tax
- Poland
- SMB
apis:
- name: inFakt API v3
  description: 'inFakt''s REST API (v3) for automating invoicing and accounting. Resources are addressed with a .json extension
    under /api/v3/ and authenticated with a per-account API key sent in the X-inFakt-ApiKey header. Confirmed resources: invoices,
    clients, products, costs, bank_accounts, vat_exemptions, payment_methods and business_activities.'
  humanURL: https://docs.infakt.pl/
  baseURL: https://api.infakt.pl/api/v3/
  properties:
  - type: Documentation
    url: https://docs.infakt.pl/
  - type: APIReference
    url: https://docs.infakt.pl/
  - type: Authentication
    url: authentication/infakt-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: VulnerabilityDisclosure
  url: security/infakt-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/infakt-domain-security.yml
- type: Website
  url: https://www.infakt.pl
- type: DeveloperPortal
  url: https://www.infakt.pl/api/
- type: Documentation
  url: https://docs.infakt.pl/
- type: APIReference
  url: https://docs.infakt.pl/
- type: GettingStarted
  url: https://www.infakt.pl/integracje-z-infakt-za-pomoca-api/
- type: Support
  url: https://pomoc.infakt.pl/hc/pl
- type: Blog
  url: https://www.infakt.pl/blog/
- type: Pricing
  url: https://www.infakt.pl/cennik/
- type: SignUp
  url: https://konto.infakt.pl/rejestracja
- type: Login
  url: https://konto.infakt.pl/zaloguj
- type: TermsOfService
  url: https://www.infakt.pl/owu/
- type: PrivacyPolicy
  url: https://www.infakt.pl/polityka-prywatnosci/
- type: StatusPage
  url: https://status.infakt.pl/
- type: Security
  url: https://www.infakt.pl/bugbounty/
- type: ChangeLog
  url: https://www.infakt.pl/historia-zmian-w-aplikacji-infakt/
- type: LLMsTxt
  url: llms/infakt-llms.txt
- type: WellKnown
  url: well-known/infakt-well-known.yml
- type: SecurityTxt
  url: well-known/infakt-security.txt
- type: MCPServer
  url: mcp/infakt-mcp.yml
- type: Authentication
  url: authentication/infakt-authentication.yml
- type: Conventions
  url: conventions/infakt-conventions.yml
- type: ErrorCatalog
  url: errors/infakt-problem-types.yml
- type: Lifecycle
  url: lifecycle/infakt-lifecycle.yml
- type: Conformance
  url: conformance/infakt-conformance.yml
- type: DataModel
  url: data-model/infakt-data-model.yml
- type: Sandbox
  url: sandbox/infakt-sandbox.yml
- type: Webhooks
  url: asyncapi/infakt-webhooks.yml
- type: ChangeLog
  url: changelog/infakt-changelog.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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