Gambling funktion 50/50 Chance Multiplier x2 (like Sats Dice LNbits)

Hello. Many are sure to know the Sats Dice "program" which works via LNbits. The rules here: The higher the chance of winning, the smaller the multiplier of the bet. The smallest multiplier is 1.5. The larger multipliers always have the decimal place 5. But I need a program with a 50/50 chance of winning with the multiplier 2. Does anyone know something like LNbits where you can create a game that generates a QR code?

I am German, sorry for the bad English (Google Translate)

Thanks