Microwork for Android and iOS is a paying application for taking photos. All you need is a phone with half decent camera.
How does it work:
There are different tasks each week(on Monday) to take pictures of something - person wearing something, someone making facial expressions, etc.
Each picture is being payd with 0.05$ in ETH. Minimum withdrawal is 1$. This means that for 20 pictures you are getting 1$ in ETH. The users greatly benefit when the ETH price is low, so withdrawing at those times is best, because you will receive a bigger amount of ETH.
The app is userfriendly and I've been using it for months now. Do not get fooled of the relatively low Play Store score of 3.7 stars. It is very good way to earn some cryptocurrency without investing. You are free to have multiple accounts in different phones and redo the same tasks over and over again. Each account is tied to the phone via the IMEI so there is no point to log multiple accounts on the same phone, it does not work.
There is no affiliate program.