Petrachor is not yet listed on any exchange (to our knowledge).
Currently, the easiest way to get Petra, and start using the Petrachor blockchain is by participating in the daily auction.
Compiling the source code and running a node is easy. This ensures authenticity of the code, and allows you to generate a Petrachor address, which you can then use to get Petra from the daily auction.
Ok. Thanks for fast response. Will stick to auction for now. Please update when exchange listing happens.