Grayscale filed S-1 Amendment 6 with a 0.29% sponsor fee for its Hyperliquid Staking ETF (HYPG), undercutting 21Shares’ THYP at 0.30% and Bitwise’s BHYP at 0.34% after promotional period. The post Grayscale Sets 0.29% Fee for Hyperliquid Staking ETF, Kicking…