The REX-Osprey Solana + Staking ETF (ticker: SSK), the first staking-enabled cryptocurrency exchange-traded fund in the United States, officially launched for trading on July 2, 2025. This ETF offers investors direct exposure to Solana (SOL) while providing staking rewards distributed as monthly dividends, effectively integrating on-chain yield into traditional financial markets. The fund operates under a unique C-corp structure that allows staking rewards to flow directly to investors. On its debut day, the ETF recorded $33 million in trading volume and $12 million in inflows, outperforming Solana and XRP futures ETFs but trailing behind Bitcoin and Ethereum spot ETFs. Within the first 20 minutes of trading, it achieved $8 million in volume and surpassed $20 million in volume within two hours. The second day saw continued strong interest, with trading volume increasing to approximately $34.4 million, bringing the total volume since launch to nearly $70 million. Approximately 80% of the fund's holdings are in spot Solana, with over half staked to generate on-chain yield. The ETF's fee structure includes a 0.75% base fee, rising to 1.28% after accounting for tax expenses. The launch marks a milestone for crypto ETFs by providing regulated access to staking rewards via Anchorage Digital and Cboe, signaling growing institutional demand for Solana-based yield products.