First of all, this technique is not 100% successful. It can only reduce !
1. Invest only on HYIP site which give reasonable plan. Most scam HYIP provide high interest to trick people to invest such as 200% after 1 Days, 400% after 2 Days
2. Check the information of that HYIP domain. This method is important for long term HYIP( 150 Days. 300 Days). The long they register the domain, more reliable.
For the short plan term, this is not necessary because most short plan HYIP will not open more that 1 month.
3. Check the comment on the main forums (TG DTM MMG). The more information, the more you reduce risk.
4. Check the rating page of that HYIP site. If they pay for famous HYIP Monitors, you can be sure that they are really paying.
5. “We do not recommend you to spend what you cannot afford to lose.”