Your country: US
Reward types: Gift cards
Incentives per survey: 0.01 to 5 US$
Cash out: from 10 US$ (4,200), 25 US$ (10,000 points)
Number of invites: about 10 surveys in a month
Age to join: from 18 years
Comments: A starting credit of 100 points for registration and 200 points for completion of the personal profile information

Your country: US
Reward types: Cash and gift cards
Incentives per survey: 1 to 3 US$
Cash out: from 10 US$ (1,000 points)
Number of invites: about 10 surveys in a month
Age to join: from 13 years
Comments: 100 points for completion of the personal profile information and loyalty program for completing surveys consecutively receive users more extra points

Your country: US
Reward types: Cash and gift vouchers
Incentives per survey: 1 to 5 US$
Cash out: from 10 US$
Number of invites: about 15 surveys in a month
Age to join: from 14 years
Comments: A reward of 5 US$ will be given after registration and participation in a short survey

Your country: US
Reward types: Sweepstakes for cash only
Number of invites: regularly due to sofware use plus occasional surveys
Age to join: from 18 years
Prize draws: Monthly $ 10,000 cash for 10 winners, stay active on the panel
Comments: This is a Nielsen special panel (world's major market research institute). You need to install software, which permanently tracks what Web-sites you visit - online surveys may be conducted on internet usage accordingly.