After Bitcoin reached a new all-time high, capital began to flow into major altcoins like SEI, ARB, and OP.

The leader of this trend has been the SEI network, which has grown by more than 20% as its network metrics show explosive growth.

This capital turnover is a classic sign that the next phase of the bullish trend, or the 'alt-season', is beginning.

The altcoin market, including Sei (SEI), Arbitrum (ARB), and Optimism (OP), has risen in tandem with Bitcoin (BTC) over the past two days. The established four-year rotation of crypto capital has intensified in recent weeks, as evidenced by a noticeable influx of funds into American spot ETFs based on Ether amid growing demand for altcoins from institutional investors.

Moreover, more than a dozen spot ETFs on altcoins are awaiting a final decision from the U.S. Securities and Exchange Commission (SEC). As a result of the growing demand for altcoins, the market capitalization of TOTAL3, excluding Ethereum (ETH) and Bitcoin, has broken out of the logarithmic downtrend established since the beginning of the year. The bullish breakout of TOTAL3 indicates the beginning of the long-awaited altcoin season of 2025.

The Arbitrum (ARB) network has become a crucial layer 2 scaling solution within the Ethereum ecosystem due to the widespread adoption by institutional investors. According to market data from Defillama, the Arbitrum network is the second largest layer 2 scaling solution after the Base blockchain, with a total locked value (TVL) of about $2.59 billion and a market capitalization of stablecoins around $3.26 billion.

In the last 24 hours, the price of ARB has increased by more than 14%, reaching around $0.423 at the time of writing. As a result, this mid-cap altcoin, with a fully diluted valuation of about $4.1 billion and an average trading volume over the last 24 hours of about $612 million, has broken out of a falling megaphone structure on the daily chart.

The Optimism (OP) network is a major layer 2 scaling solution in the Ethereum ecosystem. At the time of writing, the total locked value of the Optimism network was around $412 million, and the market capitalization of stablecoins was approximately $679 million. As a result of the increasing adoption of the DeFi ecosystem based on Ethereum in the recent past, the price of OP has risen by more than 25% in the last two weeks. This mid-cap altcoin, with a fully diluted valuation of around $2.8 billion, now has every opportunity to begin its macroeconomic upward trend.

As a result of the increasing adoption of the DeFi ecosystem based on Ethereum in the recent past, the price of OP has risen by more than 25% in the last two weeks. This mid-cap altcoin, with a fully diluted valuation of around $2.8 billion, now has every opportunity to begin its macroeconomic upward trend.