That for sure is gambling. There is no way even the best trader on earth can predict the price movement in the next 10 mins or 30 mins. This is just gambling and as I can see it pays 87% on win which means the house-edge is about 6.5% which is crazy because most casinos have 1-2% edge on original games and slots have usually 4-6% edge.

I used to play on a website I believe was called secondstrade (I think it's closed now) or something similar and it was the same concept. Burned a lot of money there but I always knew it's gambling and played in limit.

Unless you can manipulate the market with a humongous capital, it's impossible to predict the price in such short term. And if you were to manipulate the market you need millions of dollars. These sites don't accept more $1-2k bets so it won't be worth it anyways.