The TeamCity API allows developers to make HTTP requests to the TeamCity server and get a response. The API is REST-based and is available as an open-source plugin. This API can be authenticated using basic HTTP authentication.
Version 2017 (formerly known as 10.1) of the API introduces faster server startup, cloud profiles, visual studio team services connection, web UI improvements, improved build failure conditions, partial build log display, cross-platform PowerShell, proxy server for agent-to-server connections, artifact storage pluggability, NuGet support improvements, and more.
TeamCity is a Java-based continuous integration and build management server from JetBrains.