HTX Mark Price, Premium Index & Basis Focused skill for mark price , premium index , and basis kline series on HTX USDT-M perpetuals. Mark price drives liquidation; premium index drives funding rate; basis = mark − index price (the spread vs spot reference). All public. When to use this skill Load this skill when the user asks about: - "BTC mark price kline 4h" - "Show me premium index for ETH-USDT" - "Why is the mark price different from last trade?" - "Premium index history before this funding settlement" - "Mark price vs index price spread on SOL" - "Is the perpetual trading at premium or…