Are you referring to binary trading? Rollbit has futures betting
https://rollbit.com/trading/BTC but it just up and down without any timeframe since it just depend on your bust price and target profit.
Are you looking for a game like the up&down game on pancakeswap since it has same 5m time interval each round?
This one on Rollbit also seems to be in forex style, if I look at it, although I have not tried it yet, and I also have no idea what the minimum bet here is, as you say. But I also think it's okay to play here at Rollbit, since it has been around for a long time in the crypto gambling business.
Cloudbet also has it, but I'm not sure, but for me, this Rollbit is the best to do, as you say, in my opinion compared to others, I guess.