The dice site itself is nothing special tough. If i remember correctly, it's an open source dice site you can find on github (i cannot find the link right now, but i'm 95% sure i found it on github last time i was looking for new scripts), it's backed by moneypot so the site doesn't need a big bankroll to start.
That dice script is called "Untitled Dice", and the source code can be found on
https://github.com/untitled-dice/untitled-dice.github.io.