Like whether bitcoin will go up next hour or go down and stuff like these?
I just don't know if there's really a demand for this since the price can be predicted using the chart analysis and if you are good with that you can probably win a lot of money on this kind of bet. Prediction is short period of time might be more easy, many site don't have this feature. Many are still used to bet in sports and other gambling games, the interest for price prediction is quiet low because for sure, it requires a lot of work before you are able to bet and predict the right price.