https://www.kaiko.com/ seems to the same data but with far longer historical coverage (Tardis starts from April this year). The drawback of Kaiko is the higher price tag.
We have found a strong correlation between exchange flows and the price. We will examine whether this correlation can be used as a signal for trading strategies. We will keep you updated at research.tokenanalyst.io
It is not "Apple's AAC". Apple did not have any part in the development of AAC. It was actually developed by Fraunhofer as a successor to their MP3 encoding.
Looks like a great product!