Ethereum, Sui, Bittensor, and Ondo Finance are emerging as key altcoins to watch in 2026. Ethereum's recent Fusaka upgrade has enhanced its scalability and reduced transaction fees, drawing increased attention. Sui is gaining momentum with strong institutional support and its focus on real-world asset tokenization. Bittensor is positioned as a leading altcoin in the AI sector, offering unique exposure to this rapidly growing field. Meanwhile, Ondo Finance is capitalizing on the trends of tokenization and regulatory advancements, making it a noteworthy contender in the altcoin market.