Bitcoin climbs above $28,000, hitting highest level since mid-August

Crypto prices rallied on Monday, pushing bitcoin to its highest level in more than a month.

Bitcoin rose more than 4.5% to $28,329, for its highest level since Aug. 17, according to data from Coin Metrics. Ether rose more than 3% to cross above $1,700.

Bitcoin rose above $28,000 on Monday.

The catalyst for bitcoin's move was not immediately clear. There were several ether futures ETFs set to launch on Monday, which could be a positive sign for the crypto industry, which has been waiting to see whether the Securities and Exchange Commission will approve a true bitcoin ETF in the coming months.

Bitcoin has risen for four-straight weeks and is now up about 70% for the year. However, the digital currency is still more than 50% below its all-time highs.

Even with the recent rally, trading volumes for bitcoin have been light, according to Citi strategist David Glass.

"Though the global crypto market cap has risen ~30% YTD, BTC volumes are struggling to sustain higher levels. Volumes (spot plus futures) have been trending lower since March, and currently sit ~57% below 2022 averages. ... Separately, this year's crypto rally has also seen a rise in Bitcoin dominance – defined as Bitcoin's share of total crypto market cap – which has stabilized around 50%," Glass said in a note to clients Friday.

Equities tied to crypto were also moving higher, with Riot Platforms and Marathon Digital each jumping more than 7% in premarket trading.

— CNBC's Michael Bloom contributed reporting.