币界网报道：Coinbase's stock surged over 15% following multiple bullish developments, including its inclusion in the S&P 500 and a strategic partnership with Circle to expand USDC's utility. The crypto exchange now ranks among the top 300 U.S. companies by market cap after its shares climbed to $265, marking a 50% monthly gain. Analysts highlight three key catalysts: Coinbase's S&P 500 debut on March 18, Circle's new "smart contract" feature enabling programmable USDC transfers, and growing institutional interest in spot Bitcoin ETFs. The USDC partnership allows developers to build automated payment solutions on major blockchains like Ethereum and Solana. Meanwhile, Bitcoin's rally past $67,000 and record ETF inflows exceeding $10 billion signal renewed market optimism. Bernstein maintains an "outperform" rating with a $300 price target, citing Coinbase's diversified revenue streams beyond trading fees.