Sumutasu

Sumutasu Inc. (株式会社すむたす) is a Japanese property-technology (proptech) company operating under the mission "a society where people can make ideal housing choices" (住まいの理想的な選択ができる社会に). It runs an instant real-estate buying and selling service for used condominiums in Japan, using data and technology to give homeowners a fast, transparent alternative to the traditional brokerage process, alongside an agent-assisted sales offering. The company is backed by 500 Global. Its public presence is a corporate marketing website (About, Services, Members, News, and Careers) built on the Studio.Design no-code platform; no public developer platform, API, SDK, or documentation surface has been found.

Sumutasu is profiled on the APIs.io network. Tagged areas include Company, Real Estate, PropTech, Japan, and iBuyer.

Sumutasu’s developer surface includes engineering blog and 3 more developer resources.

🌐 Visit website 📡 Source on GitHub
7.2/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyReal EstatePropTechJapaniBuyerHousingMarketplace

Kin Score

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scored 2026-07-27 · rubric v0.5
Composite quality — 7.2/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.4 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 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/sumutasu: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

Sumutasu Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 3

The organization behind the API

Website
Website
 About
About
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: sumutasu
name: Sumutasu
description: Sumutasu Inc. (株式会社すむたす) is a Japanese property-technology (proptech) company operating under the mission "a
  society where people can make ideal housing choices" (住まいの理想的な選択ができる社会に). It runs an instant real-estate buying and selling
  service for used condominiums in Japan, using data and technology to give homeowners a fast, transparent alternative to
  the traditional brokerage process, alongside an agent-assisted sales offering. The company is backed by 500 Global. Its
  public presence is a corporate marketing website (About, Services, Members, News, and Careers) built on the Studio.Design
  no-code platform; no public developer platform, API, SDK, or documentation surface has been found.
url: https://raw.githubusercontent.com/api-evangelist/sumutasu/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Real Estate
- PropTech
- Japan
- iBuyer
- Housing
- Marketplace
image: https://storage.googleapis.com/production-os-assets/assets/778fe21a-a784-4231-a12e-be19751e0491
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://sumutasu.co.jp
- type: About
  url: https://sumutasu.co.jp/about
- type: Blog
  url: https://sumutasu.co.jp/news
- type: DomainSecurity
  url: security/sumutasu-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: minimal
  artifacts_added: 1
  pass: local-v1