Percentage of your profit per trade is what typically the common profit sharing to mentor but some mentorship requires upfront payment for service fee aside from the profit sharing.

I’m not sure if there’s really a legit mentorship in crypto since there’s a lot of scammer here that impersonates as professional trader. I highly recommend copy trading instead of hiring mentorship since you can have the same trade activity to professional without string attached and upfront payment. Only the profit sharing which is just minimal percentage. You can be safe this way instead of trusting someone randomly that will jist teach you what to trade.