KUFU

KUFU, Inc. is the founding name of SmartHR, Inc., the Japanese cloud HR platform, and remains the company's GitHub organization identity. SmartHR is a system of record for employee data across Japanese back-office HR — hiring and onboarding, social insurance and labour paperwork, family and dependent records, organizational structure, payslips, and withholding tax slips. The SmartHR API is a tenant-scoped REST API on a per-customer subdomain, described by a live Swagger 2.0 document covering 60 paths and 120 operations, and is offered free to existing SmartHR customers. It ships a webhook event surface, an application-gated sandbox on a separate domain, and an open-source React component library, but no official client SDK.

KUFU publishes 2 APIs on the APIs.io network: カスタム家族項目テンプレート API and Webhook API. Tagged areas include Company, Human Resources, HR Tech, Payroll, and Employee Data.

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

KUFU’s developer surface includes developer portal, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 31 more developer resources.

🌐 Visit website 📡 Source on GitHub

57.3/100 strong ▬ flat Agent 24/100 agent aware saas Full breakdown ↓
scored 2026-09-06 · rubric v0.19.0

1 APIs

Company Human Resources HR Tech Payroll Employee Data Software-as-a-Service Japan OnboardingSocial InsuranceWebhook

Kin Score

Kin Score How this is scored →
scored 2026-09-06 · rubric v0.19.0

Composite quality — 57.3/100 · strong

Contract Quality 11.8 / 21

Developer Ergonomics 11.2 / 17

Access Clarity 10.3 / 17

Operational Transparency 4.1 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 9.3 / 15

Agent readiness — 24/100 · 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 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 Insurance 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/. 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/kufu: 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 2

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

Get Started 5

Portal, sign-up, and the first successful call

Portal

DeveloperPortal

GettingStarted

SignUp

Sandbox

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

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Webhooks

Components

Conformance

Conventions

ErrorCatalog

DataModel

Lifecycle

Scroll for all 7

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 7

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

TrustCenter

Compliance

DomainSecurity

Authentication

Scroll for all 7

Operate 3

Status, limits, changes, and where to get help

Support

Support

HelpCenter

HelpCenter

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

Other 2

Properties that don't map to a standard resource type

DesignSystem

DesignSystem

Overlay

Overlay

Source (apis.yml)

aid: kufu
name: KUFU
description: KUFU, Inc. is the founding name of SmartHR, Inc., the Japanese cloud HR platform, and remains the company's GitHub
  organization identity. SmartHR is a system of record for employee data across Japanese back-office HR — hiring and onboarding,
  social insurance and labour paperwork, family and dependent records, organizational structure, payslips, and withholding
  tax slips. The SmartHR API is a tenant-scoped REST API on a per-customer subdomain, described by a live Swagger 2.0 document
  covering 60 paths and 120 operations, and is offered free to existing SmartHR customers. It ships a webhook event surface,
  an application-gated sandbox on a separate domain, and an open-source React component library, but no official client SDK.
url: https://raw.githubusercontent.com/api-evangelist/kufu/refs/heads/main/apis.yml
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: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://smarthr.jp/_astro/ogp_a-1.BA0NIxgO.jpg
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: enriched
x-tier-reason: live-openapi-and-docs
x-legal-name: SmartHR, Inc.
x-former-name: KUFU, Inc.
x-country: JP
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Human Resources
- HR Tech
- Payroll
- Employee Data
- Software-as-a-Service
- Japan
- Onboarding
- Social Insurance
- Webhook
tags_raw:
- Company
- Human Resources
- HR Tech
- Payroll
- Employee Data
- SaaS
- Japan
- Onboarding
- Social Insurance
- Webhooks
apis:
- aid: kufu:kufu-default-api
  name: KUFU カスタム家族項目テンプレート API
  description: カスタム家族項目テンプレートを操作します
  humanURL: https://developer.smarthr.jp/api
  baseURL: https://app.smarthr.jp/api/v1
  tags: []
  tags_raw:
  - カスタム家族項目テンプレート
  properties:
  - type: OpenAPI
    url: openapi/kufu-default-api-openapi.yml
  - type: Webhooks
    url: asyncapi/kufu-smarthr-webhooks.yml
  - type: Authentication
    url: authentication/kufu-authentication.yml
  - type: Conventions
    url: conventions/kufu-conventions.yml
  - type: ErrorCatalog
    url: errors/kufu-problem-types.yml
  - type: DataModel
    url: data-model/kufu-data-model.yml
  - type: Sandbox
    url: sandbox/kufu-sandbox.yml
  - type: Lifecycle
    url: lifecycle/kufu-lifecycle.yml
  - type: Conformance
    url: conformance/kufu-conformance.yml
  - type: LLMsTxt
    url: llms/kufu-llms.txt
  - type: Documentation
    url: https://developer.smarthr.jp/api
  - type: APIReference
    url: https://developer.smarthr.jp/api
  - type: GettingStarted
    url: https://developer.smarthr.jp/api/about_api
  - type: ChangeLog
    url: https://support.smarthr.jp/ja/release-notes/api/page/1/
- aid: kufu:kufu-webhook-api
  name: KUFU Webhook API
  description: Webhook を操作します
  humanURL: https://developer.smarthr.jp/api
  baseURL: https://app.smarthr.jp/api/v1
  tags:
  - Webhook
  properties:
  - type: OpenAPI
    url: openapi/kufu-webhook-api-openapi.yml
  - type: Webhooks
    url: asyncapi/kufu-smarthr-webhooks.yml
  - type: Authentication
    url: authentication/kufu-authentication.yml
  - type: Conventions
    url: conventions/kufu-conventions.yml
  - type: ErrorCatalog
    url: errors/kufu-problem-types.yml
  - type: DataModel
    url: data-model/kufu-data-model.yml
  - type: Sandbox
    url: sandbox/kufu-sandbox.yml
  - type: Lifecycle
    url: lifecycle/kufu-lifecycle.yml
  - type: Conformance
    url: conformance/kufu-conformance.yml
  - type: LLMsTxt
    url: llms/kufu-llms.txt
  - type: Documentation
    url: https://developer.smarthr.jp/api
  - type: APIReference
    url: https://developer.smarthr.jp/api
  - type: GettingStarted
    url: https://developer.smarthr.jp/api/about_api
  - type: ChangeLog
    url: https://support.smarthr.jp/ja/release-notes/api/page/1/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://smarthr.co.jp
- type: Portal
  url: https://smarthr.jp
- type: DeveloperPortal
  url: https://developer.smarthr.jp/
- type: Documentation
  url: https://developer.smarthr.jp/api
- type: APIReference
  url: https://developer.smarthr.jp/api
- type: GettingStarted
  url: https://developer.smarthr.jp/api/about_api
- type: Support
  url: https://support.smarthr.jp/ja/
- type: HelpCenter
  url: https://support.smarthr.jp/ja/
- type: Blog
  url: https://tech.smarthr.jp/
- type: GitHubOrganization
  url: https://github.com/kufu
- type: Pricing
  url: https://smarthr.jp/pricing/
- type: SignUp
  url: https://app.smarthr.jp/login
- type: TermsOfService
  url: https://smarthr.jp/terms/
- type: PrivacyPolicy
  url: https://smarthr.co.jp/privacy/
- type: DesignSystem
  url: https://smarthr.design/
- type: OpenAPI
  url: openapi/_original/kufu-smarthr-openapi.json
- type: Overlay
  url: overlays/kufu-smarthr-overlay.yaml
- type: Webhooks
  url: asyncapi/kufu-smarthr-webhooks.yml
- type: Packages
  url: packages/kufu-packages.yml
- type: Components
  url: components/kufu-components.yml
- type: WellKnown
  url: well-known/kufu-well-known.yml
- type: SecurityTxt
  url: well-known/kufu-security.txt
- type: Security
  url: security/kufu-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/kufu-vulnerability-disclosure.yml
- type: TrustCenter
  url: security/kufu-trust-center.yml
- type: Compliance
  url: security/kufu-trust-center.yml
- type: DomainSecurity
  url: security/kufu-domain-security.yml
- type: Conformance
  url: conformance/kufu-conformance.yml
- type: Authentication
  url: authentication/kufu-authentication.yml
- type: Conventions
  url: conventions/kufu-conventions.yml
- type: ErrorCatalog
  url: errors/kufu-problem-types.yml
- type: DataModel
  url: data-model/kufu-data-model.yml
- type: Sandbox
  url: sandbox/kufu-sandbox.yml
- type: Lifecycle
  url: lifecycle/kufu-lifecycle.yml
- type: ChangeLog
  url: changelog/kufu-changelog.yml
- type: X-MCPServerCandidate
  url: mcp/kufu-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: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/kufu-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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KUFU

Kin Score

APIs 2

KUFU カスタム家族項目テンプレート API

KUFU Webhook API

Open Collections 3

API Collection

SmartHR カスタム家族項目テンプレート API

SmartHR カスタム家族項目テンプレート Webhook API

Event Specifications 1

Kufu Smarthr Webhooks

Security Posture 4

Kufu Authentication

Kufu Domain Security

Kufu Vulnerability Disclosure

Kufu Trust Center

Resources