[Coinbase to Include HBAR, MANTLE, and Others in COIN50 Index in Q4] BlockBeats news, on December 2, Coinbase Institutional announced that this quarter (Q4), the Coinbase 50 Index (COIN50) will add the following assets: Hedera (HBAR), Mantle (MANTLE), VeChain (VET), Flare (FLR), Sei (SEI), Immutable (IMX). COIN50 is a benchmark index that tracks the performance of the top 50 eligible digital assets listed on the Coinbase trading platform.