The YouTube Data API supports batch processing, enabling you to
execute up to 50 operations with a single API request rather than
submit a separate request for each individual operation.
yes https://gdata.youtube.com/feeds/api/users/username/watch_later?v=2 if in https://gdata.youtube.com/feeds/api/users/username, gd:feedLink rel='http://gdata.youtube.com/schemas/2007#user.watchlater'
https://gdata.youtube.com/feeds/api/charts/live/events/featured
This feed lists promoted live events that are currently happening
or will soon take place.
https://gdata.youtube.com/feeds/api/charts/live/events/upcoming
This feed lists events that will take place within the time frame
specified for the time parameter. Valid parameter values are today
(one day), this_week (seven days), this_month (one month), and
all_time, and all_time is the default value.
Valid user types that can be appended to the feed URL are
Comedians, Directors, Gurus, Musicians, Non-profit, Partners,
Politicians, Reporters, and Sponsors.
Ex:https://gdata.youtube.com/feeds/api/channelstandardfeeds/US/most_viewed_Musicians?v=2