30$ - Altcoins from TOP20 (except BitConnect:)
Yeah stay away from this ponzi, it's just a scam.
To be honest $100 is not an big capital to invest but you can invest in altcoins that have low price but has potential to grow in future and I would suggest you to invest in Digibyte and Waves as its price is very low now and both of them can rise much higher in future so if you invest in it now and hold it for next couple of months then you will be definitely making good profits out of it.
It may not be a big capital but for someone that just wants to get some taste of cryptocurrency investment and still in the learning process. This amount isn't bad at all, my suggestion is just buy bitcoin while it is on the dip and wait for few days as it will pump again.