You have to be careful with this quick rich scheme OP. You can't just disclose the idea and scam tricks that have been commonly used by scammers. It was best to invest and just hold your funds in this situation in that way, you can assure that your money is safe.
I wouldn't trust in such interest rates being guaranteed. 5%-6% annually is usually what most investments can return, now imagine 18,5%. There is something catchy between the lines... Don't expect 18,5% profit, because when the interest is too high, it means the currency is going to lose a lot of value as the time goes by, so the interest received compensate the devaluation of the token. Similar to countries paying high interest on saving accounts annually, but with high inflation rates at same time. They give with one hand and take away with the other.
If besides the interest rate there is nothing else this cryptocurrency offers to you, I think it's better to not invest.
Honestly, 18.5% is very attractive, and greedy people will think I'll be earning huge if I invest and staked. But, they never think about the risk of such an idea, as it was likely impossible for the company to offer such huge rewards to the holder which in fact, they are just about to start, unless if they are a well-established company.