I found a website to manage many PTC websties at a time: Buxenger.
It’s nice, but you have to install a browser extension/plugin (so: for security it’s better to use it on a rarely used browser). All your PTCs are nicely shown, with totals automatically updated (on supported sites).At sign up I was told that I could get two weeks of premium if I signed up to other two sites.
So I signed up to ScarletClicks and GPTPlanet. On those two PTC there are many ads, but pay very little, like a tenth of a penny. I’ll try those for a few weeks, but in my opinion it’s impossible to make money with this (unless I pay for premium).