SEC may approve the first spot ADA ETF in the US this week, which could benefit Cardano holders.Chances of approval for spot ADA ETF have increased from 37% to 70% recently, with renewed optimism.Other cryptocurrencies like XRP, SOL, and DOGE also have multiple spot ETF filings with varying approval chances.Polymarket suggests strong approval chances for XRP, SOL, and DOGE ETFs before the end of 2025.