for 50$ you can do nothing only you can pay the transaction fee.
Try to add more funds and then jump in the crypto board.

I would suggest you turn that $50 into $500 and then invest in something that in turn will give you decent profit.
$50 is to low of a sum to make any investment. You profits will be at a minimum.

But if you cannot afford anything more right now, invest in Stellar perhaps or a coin with a lower value.

I think 50 $ is enough to invest in ICO, I think you can increase your dollar with ICO, and make sure to look for ICO with a clear objective project

$50 is not that small an amount, if you look at coins below $1 now, or let us say even half a dollar, then you have 100 coins with your 50. I would take 50 coins of two such coins, or 50 coins of something like Ripple and then the rest in a small basket.

Remember, you are buying with a target of long term hold, since it's $50. If you bought ETH or LTC when they were $5 you would have thousands today. So that is the aim for your $50, to wait two years and reap the profits.

Please do not go in with an ICO. Too risky.

Maybe i'll put that 50 dollar into alt that are not famous yet in cryptopia or coinsmarkets hoping that it will pump several folds. Or maybe you can put it into a small marketcap altcoin that have a great community and active developer like monoeci or crown.

I'd invest in Ripple. The price is still very low but the coin is very promising, $50 can turn into big money in a couple of years.

It may be a small amount of money, but, it is a good start to invest. If I am you, I would rather wait for btc to surge, it will these christmas,.. then just hold it..

However  nothing is impossible choose coin worth less than $ 1 you can buy them and keep in the long time or surfing you can also increase your account a lot. Wish success.

if i had that much money, i would invest to those coins that might have a brighter future like this incoming ESC, ETN or altcoins that looks promising.