Block Inc., the fintech company founded by Jack Dorsey, is set to join the S&P 500 index, replacing Hess Corp. This milestone reflects the increasing influence of digital payments and crypto in mainstream finance. The announcement led to a surge in Block's stock price, with shares jumping over 9% and 11% in after-hours trading. The inclusion in the S&P 500 index signifies a significant achievement for Block, showcasing its evolution from a small payment processor to a diversified financial services provider serving millions globally.