You might have created wowswap thread in the altcoin section instead as point of this thread is obviously to promote than altcoin project and not to look for the best place earn BTC passively. But let's say that you really want to give someone else your BTC and earn passive income fro it, probably the safest option is Celsius with 5% APY on BTC. I kow couple of people that are using it but I personally wouldn't trust them with my BTC.

Anyway, expect your thread to be moved to altcoin section where it belongs.