The last time I wanted to try bet builder was many years ago. I think more than 10 years ago. I was still using local betting sites at the time Anni think I have 3 of them which I still remember their name and site up till now. None of them accept bet builder. So when I started using crypto betting sites, bet builder does not come my mind at all. I will try it on Stake to know if it is possible but I doubt it.