I've seen even more than that but not with Atomic Wallet. Just so you know and for others sake that whenever a coin offers that much for staking, it means that there's lesser volume and liquidity to it. And to give you more idea about the coin, this is how it looks now for it's all years chart and that's why it's like that.
We have both given some insight into why they're making such a good deal, good deals usually come with a high risk background, so in conclusion, we should be wary of projects like this. BTW, you said you saw higher percentages but not on Atomic Wallet, I would like to see closer, where did you see those higher percentage offers?