September was a rough month for crypto investors, in particular for those betting big on ether, the token tied to the ethereum blockchain.
Etherdropped 13% for the month, its second-biggest monthly decline in the past year, behind only a 16% slide in June. Bitcoin fell 7% in September.
It’s difficult to link short-term price movements to any specific event, and with the historic rally in crypto over the past 12 months, pullbacks are to be expected. Ethereum, the second most-valuable cryptocurrency behind bitcoin, is still up about 830% in the past year.
Investors are now buying the September dip. On Friday, the first day of October, ether and bitcoin both climbed over 9%.
Ether 12-month price chart
CNBC
But the September roller-coaster reflects a particularly rocky stretch for the ethereum ecosystem, which has given investors and developers reasons for concern.
The speed of the network and high transaction fees continue to be a problem. The “London” upgrade in August was supposed to make transaction fees less volatile, but it’s had a limited effect.
Meanwhile, rival blockchains dubbed “ethereum killers” are taking advantage of ethereum’s challenges.
Ethereum also unexpectedly split into two separate chains in late August, after someone exploited a bug in the software that most people use to connect to the blockchain. That exposed the network to an attack, and not for the first time.
“All these factors could be having some impact on the speculation side, no doubt,” said Mati Greenspan, founder and CEO of Quantum Economics, in an interview. “But don’t forget that ethereum has appreciated quite handsomely so far this year and the entire market seems to be in consolidation at this time. So I wouldn’t try to read too deeply into these short-term movements.”
Still, ethereum, which serves as the primary building block for all sorts of crypto projects, like non-fungible tokens (NFTs), smart contracts and decentralized finance (DeFi), has some major hurdles to overcome to fend off the emerging competition.
Ethereum’s unexpected split
A central premise of ethereum’s security stems from the existence of only one set of virtual books, meaning you can’t create coins out of thin air. That ledger has to work, because the decentralized nature of the blockchain means there’s no rule keeper or bank that sits in the middle of transactions to act as accountant.
Ethereum developers were rightly alarmed in August when the chain split because of a bug.
“This fork temporarily created two separate records of transactions on the ethereum network – like parallel books,” said Matt Hougan, chief investment officer at Bitwise Asset Management, which created the first cryptocurrency index fund.
For a while, it was unclear whether the split would lead to a “double-spend attack,” where the same token can be spent more than once and transactions can be reversed, Hougan said.Smart contracts overseeing billions of dollars in assets could have also been at risk. Smart contracts allow people to build applications on top of ethereum with self-executing code, eliminating the need of third parties to handle transactions.
Such an attack would have been difficult to execute, since it was clear which nodes were on the correct side of the split and which were not. “But in theory, there was a risk,” Hougan said.
The good news for miners and exchanges is that most of them upgraded their software as recommended and the issue was resolved relatively quickly, said Tim Beiko, the coordinator for ethereum’s protocol developers.
Auston Bunsen, co-founder of QuikNode, which provides blockchain infrastructure to developers and companies, said it was a “responsibly disclosed vulnerability.”
“This is a reminder that blockchains in general and ethereum specifically are new and disruptive technologies,” Hougan said. “They can do amazing things – settle $1 billion transactions in minutes and program money like software – but they are not fully mature.”
Bugs keep happening
The longer-term problem for ethereum is that random glitches like this keep happening.
In April, the ethereum blockchain was hit with a bug in one of the software programs used to access it. And in November, many of ethereum’s DeFi apps temporarily went down after a Geth upgrade debacle, which led to the chain splitting in two.
Geth is short for for Go Ethereum. To access the ethereum blockchain, operators and miners have their pick of software. Most use Geth, which accounts for 64% of the network.
When the ethereum blockchain broke in half a few weeks ago, it was becauseGeth had a bug in its consensus mechanism. That’s what creates the single source of truth for transactions so everyone sees the same thing regardless of what software they’re using.
Developers discovered the bug, put out a new release with a fix and publicly told everyone to update. A lot of users upgraded, but others didn’t. When an unknown actor exploited the bug, ethereum forked, meaning that it broke into two separate chains: one for those who had updated their software and one for those who had not.
Ethereum “sought the veneer of decentralization by having many clients, but as a consequence, they have incompatibilities,” said Nic Carter, co-founder of blockchain data aggregator Coinmetrics.
When the software programs don’t talk to one another, it creates problems for the network.
Bitcoin takes a very different approach. It relies on a highly secure software program for nodes to access the blockchain. Bitcoin developers have long sought to avoid hard forks at all costs, so all changes in the core software tend to be opt in rather than pushed out to users,according to Carter.
“Ethereum prioritizes faster development, but that comes at the cost of a more fragile set of software implementations,” Carter said.
Some crypto experts attribute ethereum’s success to its first-mover advantage. Most NFTs and 78% of DeFi apps, or dApps, run on ethereum, according to the website State of The Dapps.
That’s starting to change, thanks to the growing popularity of rival blockchains.
Even before this latest split in the blockchain, users were complaining about ethereum’s heavy congestion and high transaction fees, which touched a record of $70 earlier this year, and just this week, bounced from $20 to $46 and back down to $32.
‘Ethereum killers’
At current prices, fees continue to drive some users away.
They’re turning to blockchains like Cardano, a platform used to build dApps, and Solana, whose native coin has risen nearly 4,800% since September 2020. Launched last year, Solana is gaining traction in the NFT and DeFi ecosystems because it’s cheaper and faster to use than ethereum.
Investors who had been largely focused on ethereum “have been increasingly diversifying their holdings to other cryptocurrencies, fueling alternative blockchains like Algorand, Solana and Cardano,” said Mark Peikin, CEO of Bespoke Growth Partners.
Bunsen tells CNBC that while Solana is making good strides in terms of being a usable blockchain, it’s not yet decentralized enough to satisfy the larger crypto community.
It’s also not immune to bugs. Last month, Solana suffered a 17-hour outage following a denial-of-service attack, which took the form of a flood of transactions caused by bots.
The list of so-called ethereum killers is long, and includes blockchains like Matic and Polygon, which are complementary to ethereum, according to Bunsen, as well Cardano, which is known for its security.
“I think some of those ethereum killers will make it,” said Bunsen. “But they won’t kill ethereum.”
Ethereum also has its own upgrade in the works. For several years, it’s been building ethereum 2.0, which is expected to be ready by the first quarter of 2022.
The makeover will move ethereum to a less energy-intensive mining process and, according to network founder Vitalik Buterin, could boost speed by over 7,000-fold to 100,000 transactions per second.
If it’s successful, Bunsen said, ethereum 2.0 will be a “huge upgrade in terms of throughput to the ethereum network and a huge win for the environment generally.”
The position was valued at about $160 million as of Wednesday’s close.
Tripadvisor shares have been flat since the start of the year after plummeting more than 30% in 2024. Last year, the travel review and booking company said it created a special committee to explore potential options.
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People stand in front of an Apple store in Beijing, China, on April 9, 2025.
Tingshu Wang | Reuters
Apple iPhone sales in China rose in the second quarter of the year for the first time in two years, Counterpoint Research said, as the tech giant looks to turnaround its business in one of its most critical markets.
Sales of iPhones in China jumped 8% year-on-year in the three months to the end of June, according to Counterpoint Research. It’s the first time Apple has recorded growth in China since the second quarter of 2023.
Apple’s performance was boosted by promotions in May as Chinese e-commerce firms discounted Apple’s iPhone 16 models, its latest devices, Counterpoint said. The tech giant also increased trade-in prices for some iPhone.
“Apple’s adjustment of iPhone prices in May was well timed and well received, coming a week ahead of the 618 shopping festival,” Ethan Qi, associate director at Counterpoint said in a press release. The 618 shopping festival happens in China every June and e-commerce retailers offer heavy discounts.
Apple’s return to growth in China will be welcomed by investors who have seen the company’s stock fall around 15% this year as it faces a number of headwinds.
Since then, Huawei has aggressively launched devices in China and has even begun dipping its toe back into international markets. The Chinese tech giant has found success eating away at some of Apple’s market share in China.
Huawei’s sales rose 12% year-on-year in the second-quarter, according to Counterpoint. The firm was the biggest player in China by market share in the second quarter, followed by Vivo and then Apple in third place.
“Huawei is still riding high on core user loyalty as they replace their old phones for new Huawei releases,” Counterpoint Senior Analyst Ivan Lam said.
Chinese tech giant Baidu has bolstered its core search platform with artificial intelligence in the biggest overhaul of the product in 10 years.
Analysts told CNBC the move was a bid to keep ahead of fast-moving rivals like DeepSeek, rather than traditional search players.
“There has been some small pressure on the search business but the focus on AI and Ernie Bot is a key move ahead,” Dan Ives, global head of tech research at Wedbush Securities, told CNBC by email. Ernie Bot is Baidu’s AI chatbot.
“Baidu is not waiting around to watch the paint dry, full steam ahead on AI,” he added.
Baidu AI overhaul
Baidu is China’s biggest search engine, but — as is also being seen by Google — the search market is being disrupted.
Users are flocking instead to AI services such as ChatGPT or DeepSeek, which shocked the world this year with its advanced model it claimed was created at a fraction of the cost of rivals.
But Kai Wang, Asia equity market strategist at Morningstar, also noted that short video platforms such as Douyin and Kuaishou are also getting into AI search and piling pressure on Baidu.
To counter this, Baidu made some major changes to its core search product:
Users can now enter more than a thousand characters in the search box, versus 28 previously;
Questions can be asked in a more direct and conversational manner, mirroring how people now use chatbots;
Users can ask questions through voice but also prompt the seach engine with pictures and files;
Baidu has integrated its AI chatbot features, which enable users to generate photos, text and videos, into the product.
“This is more aligned with how people use ChatGPT and DeepSeek in terms of how they look for answers,” Wang said.
Outside of China, Google has also been looking to enhance its core search product with AI, highlighting how search has been under pressure from the burgeoning technology.
Baidu on the offense
Baidu was one of China’s first movers when it came to AI, releasing its first models and ChatGPT-style product Ernie Bot to the public in 2023. Since then, it has aggressively launched updated AI models.
However, the Beijing-headquartered company has also faced intense competition from fellow tech giants like Alibaba and Tencent, as well as upstarts such as DeepSeek.
These companies have also been launching new models and infusing AI into their products and Baidu’s stock has fallen behind as a result. Baidu shares have risen around 2.5% this year, versus a 30.5% surge for Alibaba and a 20% rise for Tencent.
“This is a defensive and offensive move … Baidu needs to be aggressive and perception-wise show they are not the little brother to Tencent on the AI front,” Wedbush Securities’ Ives added.
