jam-cloud/web/app/controllers/api_feeds_controller.rb

class ApiFeedsController < ApiController

  def index
    # parse out since parameter
    since = params[:since]
    if since
      start, limit = since.split(':')
      start = start.to_i
      limit = limit.to_i
    else
      start = 0
      limit = 20
    end

    @feeds = Feed.index({user: current_user, start: start, limit: limit})
  end

end