[Coinbase 50 Index Adds 6 Digital Assets] Coinbase adjusted its Coinbase 50 Index (COIN50) in the fourth quarter of 2025, adding Hedera Hashgraph (HBAR), Mantle (MANTLE), VeChain (VET), Flare (FLR), Sei (SEI), and Immutable X (IMX). The index is designed to track the overall performance of the top 50 investable digital assets listed on the Coinbase platform.