Yes, for now it supports only spot market. The docs are very poor for now, the project is recent (a couple of weeks), but I will try to create a website for it, soon.
I used Gekko for a long time, it is a great project.!
Hi, Ninjabot author here. The idea of Market Change is to compare your strategy with the "buy and hold". It means, buys at the start of the period and sell at the and. We also use avg price, because the user can create several buys and a single sell. And the profit is based on the average price in this case.