Poloniex interest rate is under 5% yearly.
Its a small amount of interest its just like local bank interest.. and investing in exchange site right now are risky because some exchange site are collapse so maybe poloniex will be the next even we know poloniex is one f the trusted just lets hope that it will not be collapse just like bitfinex and mt gox..
Poloniex blows a savings account out of the water. A savings account offers 1% if you're lucky, with the top payers not deviating much higher than that. Lending through Poloniex essentially works like a savings account. The flip side is that there is substantially more risk for lending through poloniex as opposed to sticking money in a savings account. If poloniex steals the funds or goes out of business, there is no recourse. At least a savings account is FDIC insured.