Hi Solotraveler, there is no fixed amount that will definitely get you a free/discounted trip. You have to have the highest credits at the end of the month to win a free trip. Following page will give you an idea on different ways to earn credits: https://www.tripoto.com/tripoto-credits. One more thing, you can get discounts by using the earned credits. For example, by using 50 credits you can get Rs. 1000 off on a Ladakh Bike Trip. For more information on discounts, please refer to https://www.tripoto.com/get-paid-to-travel-contest.