Aspect of the Flipper, commonly known as AotF, is a program to automate auction flipping in Hypixel Skyblock. It was developed in 2021 and popularized by iCheppy. The program's architecture consists of the client and the server. The client is a Minecraft Forge mod that fetches flips from the server and displays them in the Minecraft chat. The server, on the other hand, analyzes the auction house to detect profitable flips.
Shortly after the mod's public announcement in 2021, it was made available to a select group of people. Around that time, a week of private access to AotF was auctioned off to a single user. Shortly after, the development of AotF was stopped. Currently, the source code of the AotF server is publicly available on GitHub. However, it is not maintained and probably doesn't work. As of now, there is no way to purchase or obtain a working version of AotF.