PayPal is one of the most frequently used online payment systems. These international sites pay you through PayPal for taking online surveys. All of them are free to register and easy to use. You can earn money even if you not fluent in English (most of the surveys are in your mother language).
The minimum payout is only $5!
Mostly psychological surveys (no psychology knowledge required!). The minimum payout is $10.
ySense (previously ClixSense)
This is one of my favourites. The minimum payout is $10.
Only for Android phones/tablet and iPhone/iPad. The minimum payout is $3.
This site offers higher rewards than others. You should definitely try it. The minimum payout is only $1.
The minimum payout is $5.
The minimum payout is only $1!
The minimum payout is 10 Euro.
You can join here:
Join to the Earn Money With Surveys Facebook group for more opportunities!
PanelPlace.com is not exacly an international site, but it is available from many countries. You should give it a try if you are from US, GB, CA, HK, NZ, AU, SG, PH, TH, VN, ID or MY. The minimum payout is $25. You can join here: PanelPlace.com
If you are living in the UK You can find more survey sites here. You can also find US survey sites here.
Visit this site for Greek offers.