Tsinghua University GitLab
Tsinghua runs its own GitLab instance at git.tsinghua.edu.cn, on its own registrable domain and behind its own identity service — the sign-in page's only form posts to /users/auth/thuid. GitLab exposes a substantial REST and GraphQL API, but this deployment gates all of it behind THU ID authentication, publishes no public projects to an anonymous visitor, and offers no outside credentialing path. It is recorded as a surface because it is a genuine institution-operated developer platform, and no contract is saved under it because the API contract is GitLab's product API, identical across every GitLab installation, and would credit Tsinghua with GitLab's engineering.