Crypto markets rebounded on Thursday but continue to exhibit signs of bearishness.

Bitcoin, the world’s largest cryptocurrency by market capitalization, was up by 2.1% as of press time Thursday. BTC was below the 10-hour moving average and near the 50-day, a bearish signal for market technicians.

Earlier in the day, bitcoin climbed from a low of $35,709 around 01:00 UTC (9 p.m. ET Wednesday) to as high as $42,441 12 hours later, an 18% gain, based on CoinDesk 20 data. But then bitcoin slid, to $40,265 as of press time. 

“At this point, a break above $40,500 could push towards $45,000,” quant fund ExoAlpha advised in an investor note. “But we would remain cautious either to open a short position here at $38,000 or go back in on the long side at this same level.”

The crypto markets were flashing green before news broke that the U.S. Treasury is requesting more stringent tax reporting requirements for businesses transacting in crypto.

“There are definitely still some downside risks left short term, and markets rarely rebound in one single move up,” said Jean-Marc Bonnefous, managing partner of investment firm Tellurian Capital. “Political noise, with news of tax rules tightening, is still weighing on a prompt recovery.”

Read More: Bitcoin Remains Under Pressure, Faces Resistance At $45K

Crypto’s notorious volatility appears to be on the rise. On Wednesday, bitcoin’s 30-day volatility went over 80% for the first time since March. Ether’s gyrations were even higher: It gained 30 percentage points in one day, to 139%. 

Traders may be salivating at generating profits from the fluctuations.

“Crypto is here to stay and the volatility we're currently witnessing is creating an attractive entry point to add to and create new positions,” said Steve Ehrlich, chief executive officer of the cryptocurrency brokerage Voyager Digital.

Crypto over-the-counter trader Alessandro Andreotti doesn’t think ETH maximalists care if the asset behaves wildly.

“I don't think long-term holders in ETH will be too bothered by that, honestly,” Andreotti said. 

Brian Mosoff, chief executive officer of investment firm Ether Capital, said that one “interesting benefit to volatility” is it provides a real-time stress test of cryptocurrency market infrastructure, including of both centralized exchanges and decentralized finance. 

“Though these systems are not perfect, they're becoming more robust and able to handle larger volumes and price swings without breaking down,” Mosoff said.

In the derivatives market, funding costs for leveraged bitcoin trades have gone down. Some venues even went negative before heading up, and were close to zero as of press time. It’s a sign of a lack of interest in using the crypto equivalent of margin to make trades.  

“A lot of leveraged length has been stopped out and the market is much cleaner and should build a base for recovery,” said Tellurian’s Bonnefous. 

One additional sign of bear mode is in the futures market: Bitcoin open interest has dropped by $5 billion from Tuesday to Wednesday. It’s a sign institutional interest may be waning. At least for now. 

“Although it's not entirely clear where crypto is headed for the short- to mid-term, in my opinion we are definitely not out of the woods for another dump,” said trader Andreotti.

The second-largest cryptocurrency by market capitalization, ether, was trading around $2,804 as of 21:00 UTC (4:00 p.m. ET), climbing 7.5% over the prior 24 hours. The asset is below the 10-hour moving average as well as the 50-day, a bearish signal for market technicians. 

Ether popped Thursday but (like bitcoin) varied wildly in the past 24 hours, going from a low of $2,216 around 01:00 UTC (9 p.m. ET Wednesday) to as high as $2,992 a dozen hours later, a 36% jump according to CoinDesk 20 data. ETH then slid and settled at $2,804 as of press time. 

In the ether options market, traders appear mega-bullish on the asset hitting $5,000. According to data aggregator Skew, over 90,000 ETH in open interest is in calls with a $5,000 strike price. In options, a call is the right but not obligation to buy an asset before a specified date, known as expiration.

Options traders are likely loving ether’s volatility, said Marc Fleury, partner at investment firm Two Prime.

“We are witnessing explosive moves up and we should expect violent corrections as well,” said Fleury. “Increasing liquidity will increase short-term volatility and decrease long-term volatility, particularly in the crypto derivatives space. At least, that is what monetary theory predicts.”

Quant firm ExoAlpha noted in its investor letter Thursday that the previous bull cycle had massive gyrations. That might explain the ETH calls betting on a record price level. ETH’s current zenith is $4,382, according to CoinDesk 20 data.

“On a longer-term perspective, the bull trend remains intact for this cycle,” ExoAlpha noted. “In 2017, the bull run had been hit by two corrections of -40% and the market quickly recovered to new heights.” 

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Digital assets on the CoinDesk 20 are all green Thursday. Notable winners as of 21:00 UTC (4:00 p.m. ET):

Equities:

Read More: What Coinbase’s Media Play Means for Crypto

Commodities:

Treasurys: