Emre Yumlu 
Another historic step has been taken for crypto markets. The first staking-enabled spot ETF based on the Solana network, REX-Osprey SOL + Staking ETF ($SSK), began trading on U.S. exchanges as of July 2, 2025. In just the first 30 minutes, the ETF recorded a trading volume of $9 million, attracting strong interest from both retail and institutional investors.
This new ETF stands out as one of the first products to offer yield-based exposure to crypto assets. Experts suggest that the success of $SSK could pave the way for similar ETFs focused on other Proof-of-Stake (PoS) networks like Ethereum and Avalanche.
What is $SSK? The First ETF Combining Solana + Staking Features
Officially named REX-Osprey SOL + Staking ETF, the fund offers spot exposure to Solana price movements while also delivering on-chain staking rewards to investors—making it the first ETF of its kind.
The fund’s structure differs from traditional ETFs by directly integrating staking revenues. Investors can benefit from these returns simply by buying shares—without the need to use a crypto wallet or DeFi protocol.
The ETF operates under a C-corporation model in accordance with the Investment Company Act of 1940. This allows staking rewards to be collected as corporate earnings within the fund and distributed to investors accordingly. The structure provides regulated access to staking income while eliminating the need to manage technical complexities.
SEC Approval Sets a Precedent: A Regulated Staking ETF
Following extensive discussions with the SEC, the U.S. Securities and Exchange Commission finalized its comments on the fund structure, clearing the way for its listing. This marks the launch of the first ETF in the U.S. that includes staking income.
Bloomberg ETF analysts reported that 40% of the ETF’s assets will consist of securities to comply with regulatory standards, and the total fee rate will be 1.28% when factoring in C-corp tax structure.
Is an Ethereum ETF Coming Next?
REX Shares has also filed an application with the SEC for an Ethereum (ETH) staking ETF. If approved, staking-yield ETFs could emerge as a new investment class in the crypto space. As regulatory clarity increases around taxation, legal classification, and investor protection, these yield-generating crypto funds may become more accessible to traditional investors.
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