Solana's Open Interest (OI) has crossed $5 billion mark as SOL remains bullish, reaching over $145.Market watchers await to see how high SOL will climb in April with its surging OI and strong price performance.Trump's acknowledgement of the Solana-native TRUMP token has contributed to the latest Solana rally, with SOL prices rising in the spot markets.Derivatives metrics signal bullish sentiment swings for SOL in April, with increased trading volume and options open interest.