Is this the website on that Suncoin platform? https://thesuncoin.io/ It seems broken website and when I researched I saw that there is maintenance. Digging research is a good step in choosing an exchange platform, you can check them here in this forum their ANN thread. Here.. And no data shown in CoinsMarketcap, it is inactive.
https://coinmarketcap.com/currencies/suncoin/

I strongly recommend you to choose legit and reputable exchange like Binance or might check here the list of all exchanges site. Focus on investing Bitcoin because it has a promising return on your investment, but first, understand very well how risk in investing in crypto.
Crypto exchanges comparison [trade fee + listing fee + age + mobile app + more!]