美股盘前：三大股指期货齐跌，亚马逊跌约7%，coinbase跌约11%，苹果涨约2%

Core Viewpoint - U.S. stock index futures are all down ahead of market opening, with significant movements in major companies like Amazon, Apple, and Coinbase [1] Group 1: Market Overview - Nasdaq 100 futures fell by 0.9%, S&P 500 futures dropped by 0.8%, and Dow futures also decreased by 0.8% [1] Group 2: Company Performance - Amazon's stock declined approximately 7% due to third-quarter operating profit guidance falling below market expectations and slower sales growth in its cloud computing business compared to major competitors [1] - Apple's stock increased by about 2%, with the company reporting its third fiscal quarter revenue growth rate at a three-and-a-half-year high [1] - Coinbase's stock fell around 11% as the company's second-quarter total revenue was below expectations [1] - Figma, a software design giant, saw its stock rise by approximately 26%, following a previous trading day increase of 250% [1]