The OpenTok .NET SDK by TokBox allows to create sessions and tokens to interact with the API. References include installation with NuGet and usage with sessions, tokens, and archives. TokBox is a WebRTC company that provides communication solutions in video, voice, and messaging features.
Microsoft has announced that paid plans are now available for the Bing Search APIs that are part of Microsoft Cognitive Services. The suite of Bing Search APIs that can now be purchased includes Bing Web Search API, Bing Image Search API, Bing Video Search API, and Bing News Search API.