Adult affiliate vertical has a webcam subset. Users are willing to witness online private shows, while you receive fee for registration (CPL), account top-up (CPA), or a percentage of earnings of the webcam model you have attracted to the platform. There is also a RevShare option (sometimes up to 60%) that gives you a percentage of the sums an attracted user spends on the platform. Users are linked you indefinitely, so it makes for a decent passive income.