Yes there are many bounty that pay in bitcoin and you can actually visit the services section for those one. You cannot see those one altcoins section. However you will need to work on your account and make quality post before you can be accepted into those campaign. I think there are few campaign that pay in ethereum and those are also not reliable as I have joined some of them and they hardly pay.
I ever read about that campaign which pay in weekly basis but the reward is not good.
If we join with bounty give us the token the reward is higher. It because the token price can go higher again.