Ethereum Open Interest Surges to $28B: Altcoin Season Gains Momentum

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Ethereum’s derivatives market has seen an explosive surge in recent days, signaling the beginning of a long-awaited altcoin season, according to Singapore-based QCP Capital. The trading desk noted that perpetual open interest (OI) in Ethereum futures has jumped dramatically—from under $18 billion to over $28 billion in just one week. This significant uptick pushed the broader “altcoin-season index” above the key 50-point threshold for the first time since December, a signal many investors have been waiting for. The surge in Ethereum OI, especially on major platforms like CME and Binance, is not just being driven by retail traders chasing momentum. QCP argues that institutional investors are now leading the charge, reflecting a notable shift in the market landscape driven by evolving narratives and structural changes.

One major catalyst behind this altcoin rotation appears to be the signing of the GENIUS Act last Friday. This new legislation introduces a federal framework for stablecoins, requiring issuers to maintain 100% reserves in either short-term Treasury bills or cash, while also falling under the jurisdiction of the Bank Secrecy Act. The Biden administration hailed this move as historic, emphasizing that it would help the United States take a leading role in the global digital currency race. According to QCP, this newfound regulatory clarity has prompted many corporate treasuries to start accumulating Ethereum and other major smart contract platforms such as Solana, Cardano, and the XRP Ledger. These protocols are increasingly being viewed as core infrastructure that will directly benefit from the expected boom in stablecoin issuance.

In the past, similar behavior was observed in Bitcoin markets, especially with public companies like MicroStrategy and Japan’s Metaplanet adding BTC to their balance sheets. Now, the same “hard-money playbook” is seemingly being applied to Ethereum and its peers. As confidence in regulatory stability grows, institutional investors are shifting their focus towards platforms that can support the next generation of digital finance. Supporting this trend, spot Ethereum ETFs recorded a net inflow of $602 million on July 17, surpassing the $522 million seen by Bitcoin ETFs on the same day. This marked the first time Ethereum outpaced Bitcoin in ETF flows since the inception of U.S.-based crypto exchange-traded products (ETPs) 18 months ago.

Among the major players, BlackRock’s iShares Ethereum Trust stood out with the largest single-day subscription. QCP notes that this aggressive positioning sends a strong message of confidence, particularly as BlackRock seeks regulatory approval for an amendment that would allow the fund to engage in on-chain staking. Industry analysts believe the U.S. Securities and Exchange Commission (SEC) is likely to make a ruling on the batch of staking amendments by the end of the year, despite BlackRock submitting its amendment later than others. If approved, this move would further reinforce Ethereum’s attractiveness to institutional investors, especially those seeking yield-generating assets with a compliant structure.

Meanwhile, in the derivatives market, the bullish sentiment is being echoed through aggressive options activity. QCP highlighted substantial demand for out-of-the-money call spreads, particularly the ETH-26 Sep 25 $3,400/3,800 and ETH-26 Dec 25 $3,500/4,500 contracts. Additionally, traders are showing strong interest in call-side risk reversals across various tenors. The skew in implied volatility has now tilted heavily in favor of calls, a pattern not seen since the coin surge of April 2024. This indicates that traders are increasingly willing to pay a premium for upside exposure, especially through the fourth quarter—a period that could coincide with a potential approval of ETH staking within ETFs.

Ethereum’s rising influence has already begun to reflect in broader market dynamics. The token has cut into Bitcoin’s market dominance, reducing BTC’s share from around 64% to 60%, while ETH’s dominance rose from 9.7% to 11.6%, according to QCP’s data. This kind of shift in market share typically occurs when investors diversify away from Bitcoin into other assets, a hallmark of altcoin seasons in past cycles. If these trends continue, and if there is sustained momentum in the options markets, QCP believes that the next leg of the altcoin rally may already be unfolding.

In conclusion, Ethereum’s soaring open interest, increased ETF inflows, and supportive regulatory developments suggest that institutional investors are betting big on the future of smart contract platforms. With altcoin season indicators flashing green and capital flowing into alternative assets, the crypto market may be entering a new phase of growth and diversification. If momentum holds, Ethereum could be at the forefront of this shift, drawing further investment and sparking renewed interest in the broader altcoin ecosystem.

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