Ustream allows third-party clients to access Ustream users' resources (data) via a HTTP-based (RESTful) API. It also provides a Broadcaster Library that is capable of broadcasting to a user's channel. Both the REST API and the Broadcaster Library uses the OAuth 2.0 protocol for authentication and authorization.
Manage your channels remotely, read and change security settings, branding, video recording, and many more.
PHP sample code
An example PHP library for some basic API calls.
Social Stream API
Read and display messages from a Ustream channel page on your website.