How do scams work in HYIP world? They offer you percentage for small amount of days. You invest and partially get back returns. The same works with crypto too only difference being HYIP is more volatile and risky. Take a look at below image, scam company which will wind up in 30 days is giving returns. So how do we be safe from this. Simple. Do not invest. Anything that gives you more than 10 percent interest is likely to end up in scam.