Is DAG crypto on Coinbase?

Excuse me, I've been doing some research on different types of cryptocurrencies and I came across DAG. I'm wondering if you could help me out. Is DAG cryptocurrency currently available for trading on Coinbase, or is it only offered on other exchanges? I'm interested in adding it to my portfolio but I want to make sure I'm using a reputable platform. Any insight you can provide would be greatly appreciated.