Best Altcoins to Buy Today, September 16 – XRP, SEI, SOL

Highlights:

• The best altcoins to buy today are XRP, SEI, and Solana, each showing unique momentum.
• XRP’s new ETF launch could spark fresh investor attention and wider crypto adoption.
• Solana’s institutional backing and bullish chart setup hint at a possible breakout above $250.

The crypto market began the week under pressure as investors awaited the forthcoming Federal Reserve interest rate decision, which will be felt in all asset classes. The uncertainty has seen the global market cap decline by 1.30% despite holding above the $4 trillion mark. The largest asset, Bitcoin, has dropped below the $116k mark, while most of the altcoins trade in red. In the section below, let’s discuss the best altcoins to buy today, such as XRP, SEI, and Solana.

Best Altcoins to Buy Today

1. XRP

Ripple’s XRP is trading around $2.99 with a decline of 2% over the last 24 hours. The altcoin has been trading on a bearish note recently, dropping from highs of $3.20, leading to a drop of almost 5% on the monthly chart. Its market cap has declined to $178 billion, while the trading volume surged by 30% to $7 billion.

This week, the XRPR ETF by Rex-Osprey is being launched, a new milestone in the Ripple-related investment. According to crypto expert Eleanor Terret, the XRPR fund is a 40 Act fund, combining XRP, U.S Treasuries, and cash. The combination offers tighter control than is the case with normal spot ETFs. The fund invests 80% of the value in XRP.

🚨NEW: The REX-Osprey XRPR ETF launches this week. To my understanding, it’s a spot product in a ’40 Act wrapper that holds real $XRP plus cash, Treasuries and some derivatives. Basically a spot ETF with extras, and is more regulated than traditional spot products. https://t.co/8ZkxfEnLSh

— Eleanor Terrett (@EleanorTerrett) September 15, 2025

This move might likely drive the SEC to authorize more ETFs by October. Some view XRPR as an indication of what’s next in crypto. Investors looking for the best altcoins to buy today should include XRP since it could stand to make headlines very soon.

2. SEI

SEI’s price currently exhibits a bearish outlook, having declined by 3% on the daily chart. During this period, SEI has been trading in a tight range between $0.3125 and $0.333. Its market cap and trading volume stand at around $1.92 billion and $175 million, respectively.

SEI has bounced after recent lows. Market analyst Ali Martinez identified a TD Sequential buy signal on the hourly time frame. The signal came along with a bullish divergence on the RSI, which tends to be associated with a potential reversal. The present support is at $0.310, and the price is now consolidating above this level.

Bitcoin $BTC Sell-Side Risk Ratio just dropped below 0.1%. This level often signals local bottoms, accumulation phases, and low sell pressure. pic.twitter.com/lbP8JOe8Of

— Ali (@ali_charts) September 16, 2025

Martinez noted that there’s a chance for SEI to bounce towards $0.34 in the next sessions. Key Fibonacci resistance levels continue at $0.321, $0.327, and $0.333. With bullish momentum on the rise, SEI is attracting attention as one of the best altcoins to buy today.

3. Solana (SOL)

Solana has faced a minor pullback after its recent rally, which saw its price surge by 8% the past 7 days. Solana’s price has rallied by 22% over the past month, with resistance and support levels noted at $250 and $175. As of this writing, the price is sitting around $236 with a market cap of $128 billion.

Solana is nearing the $250 resistance level and is forming an ascending triangle on the weekly chart. Analyst Captain Faibik noted that higher lows continue to accumulate pressure near this threshold. He added that a close of over $250 could lead to a bullish breakout. If the pattern holds, such a move could point toward a longer-term target near $1,250.

$SOL is forming a massive Ascending Triangle on the Weekly timeframe..!!

A confirmed weekly close above $250 will be the official trigger for the SOL Bullrun of 2025–26.. 🚀

Accumulation phase won’t last forever Buy now or Regret later!

🎯 Longterm Target: $1,250#Crypto… pic.twitter.com/233qZ4wbDv

— Captain Faibik 🐺 (@CryptoFaibik) September 15, 2025

Meanwhile, institutional demand is increasing. Galaxy Digital recently bought out $306 million worth of SOL, and Forward Industries introduced a $1.58 billion treasury. With these moves, Solana adds weight to the current bullish setup as one of the best altcoins to buy today.