Nov 9 (Reuters) - U.S. cryptocurrency exchange Coinbase Global Inc (COIN.O) on Tuesday reported a nearly 30% fall in third-quarter trading volumes on a sequential basis, hit by an easing in trading in bitcoin and other cryptocurrencies. Trading volumes was $327 billion for the quarter, down from $462 billion in the prior quarter. The company reported net income attributable to common shareholders of $405.34 million, or $1.62 per share.