Newly added coins on Coinbase Pro (and most other exchanges as far as I can tell) tend to swing violently up, down, then up, as in a head-and-shoulders-type structure, alternating that with its inverted counterpart at times, usually many times over the course of its inaugural week and sometimes longer. We saw that with ADAUSD yesterday. MATIC is repeating its opening cycle, it looks like. See below for reference.