I am still unable to wrap my head around the very high-interest rate which is offered here. If I am willing to hold the instrument till maturity and provided the risk measures shown on the website are in place then this return is too hard to pass up.
It is indeed a risky investment, so invest a very small portion of your corpus in such investments and also diversify that across the different companies listed at Tradecred. I have only invested an amount I am comfortable losing in case of default.
10-11% in 80-100 days is mind boggling. 
The interest rate quoted is per annum, not for the tenure of 80-100 days. You can work out the prorated amount for the tenure.