Coinbase, the biggest U.S. crypto exchange, reported first-quarter revenue of $1.4 billion, down 31% from a year ago amid a crypto market downturn. Shares fell 5% in after-hour trading. The company’s net loss in the quarter was $394 million, down from a net profit of $65.6 million a year ago but smaller than a loss of $667 million in the prior quarter. Monthly transacting users fell 15% to 8.2