A photomask (also known as a “light mask”; in China, it is called “photomask (light mask)”) is one of the most critical categories of consumables in the semiconductor manufacturing process—and also one of the easiest for investors to overlook. In April 2026, Citrini Research analyst Jukan pointed out that “HBM4 brings an outsourced photomask market that did not exist in the past, and Japanese companies will become the biggest winners.” Within just a week, The Seoul Economic Daily confirmed that this quarter, Samsung and SK hynix’s outsourced photomask revenue has doubled year over year. This article delivers a full breakdown—from what a photomask is and what kind of photomasks HBM4 needs, to why Japanese firms dominate the field, and how investors can get involved. What is a photomask A photomask is a template used during semiconductor chip manufacturing to transfer circuit patterns onto a silicon wafer via a “copying/printing circuit pattern” process. At its core, it is a highly precise quartz glass plate; the surface is coated with a chromium metal layer with a thickness of tens of nanometers to hundreds of nanometers, and through electric

X is pushing for a more structured subscription model, divided into three tiers: Basic, Premium, and Premium+. It focuses on price tiering, traffic distribution, and AI capabilities. The Basic tier is suitable for heavy users, while Premium offers more visibility and monetization tools, and Premium+ is ad-free with advanced AI features. Overall, this may be valuable for creators with monetization needs, but typical users may have a hard time seeing the value.

The founder of Muddy Waters, Carson Block, after trying the AI tool Claude, shifted his view of the economic outlook from optimistic to pessimistic. He warned that AI replacing knowledge work will trigger a severe economic crisis, and has already started shorting ETFs in the credit market. He noted that 15% of knowledge work is about to disappear, and predicted it will lead to a contraction in consumption and a systemic crash. His move to restart the short-selling setup has drawn attention in the current market.

The social platform X recently adjusted its creator monetization program, aiming to crack down on farm accounts and unauthorized content and significantly reduce the revenue share percentages for these accounts. X product lead Nikita Bier said these accounts affect the original ecosystem and warned that abuse of titles will be punished. The well-known account @dom\_lucre had its ability to monetize canceled, drawing mockery from netizens.

Meta has launched a new AI model, Muse Spark, which will roll out on platforms such as Facebook and Instagram and replace the existing Llama model. The model supports multi-modal generation of mini-games and interactive charts, among other functions. Its installations have surged, bringing the Meta AI app into the top five of the U.S. download rankings, and pushing global installs beyond 60.5 million.

The U.S. Senate will reconvene on April 13, with the Clarity Act as the first order of business. The bill aims to establish a regulatory framework for the cryptocurrency market and clarify the jurisdiction of the SEC versus the CFTC. Although a compromise has been reached on the stablecoin yield issue, the bill still faces other disputes. To get legislation completed before Congress adjourns in August, tagging must be completed by the end of April; otherwise, it will be pushed to the fall. If successful, it will provide a clear legal environment for the U.S. crypto market.

Phantom wallet in Solana’s ecosystem experienced a service outage during the airdrop period, causing abnormal token prices and account balances to be displayed, which affected users’ transactions. Some users suffered losses as a result and are demanding compensation. Security experts warned of phishing attack risks and advised users to verify on-chain data. Although the issue has been resolved, the trust crisis still needs to be monitored. This incident highlights the challenges self-custody wallets face in terms of system stability and user experience.

The United States and Iran held historic direct talks on April 11 in Islamabad, Pakistan, marking the first high-level diplomatic contact since the 1979 Iranian Revolution. The aim is to stabilize the ceasefire and seek a war-resolution solution. Both delegations are large in size, and Pakistan is serving as the intermediary. The negotiations are set against the backdrop of recent military clashes and their impact on global financial markets, and the market will closely watch developments.

Phantom, a wallet in the Solana ecosystem, experienced a service outage during the airdrop, causing abnormal token price and account balance displays and affecting users’ transactions. Some users therefore incurred losses and are demanding compensation. Security experts warn of the risk of phishing attacks and advise users to verify on-chain data. Although the issue has been fixed, the trust crisis still needs to be monitored. This incident highlights the challenges self-custody wallets face in terms of system stability and user experience.

Research shows that multiple reputable AI benchmark tests have security vulnerabilities that can be systematically exploited to achieve high scores. The research team revealed structural flaws and developed the WEASEL scanning tool to identify and patch these vulnerabilities. They noted that improper evaluation design may distort results and affect the assessment of an AI’s real capabilities.