# 4DBIM (Beijing Yunjianxin Technology Co., Ltd. / 北京云建信科技有限公司)

> generated: 2026-09-05
> method: generated
> source: apis.yml plus live fetches of http://www.4dbim.ren/ (2026-09-05). 4DBIM does not
> publish an /llms.txt of its own; this file is written by API Evangelist and is not a
> provider-published document.

4DBIM is a Beijing construction-technology company founded in 2015 that commercializes
Tsinghua University 4D-BIM and BIM-FM research as a full-lifecycle Building Information
Modeling platform for infrastructure engineering — municipal construction and "national
lifeline" projects such as metro, bridge, highway, tunnel and utility-corridor works.

## What is important for an agent to know

- **There is no public API.** As of 2026-09-05, 4DBIM publishes no developer portal, no API
  reference, no SDK, no webhook catalog and no machine-readable contract (OpenAPI, AsyncAPI,
  GraphQL SDL, Protobuf, WSDL or Postman collection). Every discovery path probed on
  www.4dbim.ren, the 4dbim.ren apex and www.4dbim.cn returned 404 or 403 — see
  `well-known/4dbim-well-known.yml`.
- **The API is marketed but not documented.** The 4DBIM Cloud product page lists
  "API开放平台" (API open platform) as a platform capability alongside the BIM+GIS data engine
  and IoT ingestion. No link, reference or specification accompanies the claim. Access appears
  to run through a commercial engagement.
- **No API host exists.** api / cloud / docs / dev / developer / open / openapi / platform /
  app / login and 12 further conventional subdomains of 4dbim.ren do not resolve.
- **The site is HTTP-only.** TCP 443 on www.4dbim.ren is refused; there is no TLS, no HSTS,
  no SPF, no DMARC, no CAA and no DNSSEC on 4dbim.ren. Do not send credentials to this host.

## Products

- **4DBIM Cloud (4DCloud)** — http://www.4dbim.ren/zh/products/cloud — cloud, microservice
  "engineering lifecycle data centre"; lightweight BIM+GIS graphics engine, multi-source model
  fusion (Revit, oblique photogrammetry), IoT ingestion, cross-platform/multi-terminal access.
- **Power4D** — http://www.4dbim.ren/zh/products/power4d — construction-stage management:
  schedule, quality, safety, cost, materials and plant, tied to the model.
- **Wonder4D** — http://www.4dbim.ren/zh/products/wonder4d — operations and maintenance:
  equipment lifecycle, energy monitoring, space management, security monitoring.
- **Skill4D** — http://www.4dbim.ren/zh/products/skill4d — 3D visual work instructions for
  construction sequences, technical briefing and worker training; mobile viewing.
- **Smart4D** — http://www.4dbim.ren/zh/products/smart4d — smart precast beam-yard management
  from casting to erection, with IoT capture and production scheduling.
- **BIM consulting** — http://www.4dbim.ren/zh/consulting — maturity assessment, enterprise
  build-out, resource survey, solution authoring, pilot design, outcome operations.

## Pages

- Home: http://www.4dbim.ren/zh
- About: http://www.4dbim.ren/zh/about
- Products index: http://www.4dbim.ren/zh/products
- Project cases: http://www.4dbim.ren/zh/cases
- News: http://www.4dbim.ren/zh/news (most recent item dated 2020-09-22)
- Careers: http://www.4dbim.ren/zh/about/careers
- Contact: http://www.4dbim.ren/zh/about/contact
- English: http://www.4dbim.ren/en

## Contact

- Business: market@4dbim.ren (the footer also prints market@4dbim.cn, but 4dbim.cn publishes
  no MX record)
- Switchboard: +86 10 88415500 / +86 10 86465500
- Head office: 3205 Baiwang Hongxiang, Tangjialing, Haidian District, Beijing, China
- ICP filing: 京ICP备16021145号-1

## Company

- Founded 2015; founder and chairman Zhang Jianping (张建平), Tsinghua University Department
  of Civil Engineering.
- Roughly USD 13.7M raised through Series B; investors named publicly include Poly Capital,
  Hillhouse, Country Garden Venture Capital and Sfund.
- Reported enterprise partners: China Railway No. 4 Engineering Group, China Academy of
  Railway Sciences, Chengdu Architectural Design and Research Institute; reseller network
  cited as reaching 1,000+ projects across 100+ cities.
- Reference projects: New Shougang Bridge (Beijing Urban Construction Group), Guangzhou Metro
  Lines 18/22 (China Railway Construction South China), Taiyuan East Second Ring Expressway,
  Shenzhen-Zhongshan Link smart beam yard (China Railway Major Bridge Engineering Group).

## API Evangelist artifacts in this repository

- apis.yml — the APIs.json profile
- security/4dbim-domain-security.yml — TLS/DNS/mail posture (probed)
- well-known/4dbim-well-known.yml — discovery-path probe record (all misses)
- plans/4dbim-plans-pricing.yml — no published pricing (plan_count 0)
- rate-limits/4dbim-rate-limits.yml — no published limits (limit_count 0)