An instant is the smallest unit of time people actually experience, and news has compressed toward it. Alerts, live blogs, push notifications, and the expectation that significant events are known within minutes rather than the next morning.
Newsinstants.com names that mode of consumption. It fits a breaking news service, an alerts product, a real-time aggregator, or a short-format news app. The alerts reading is the most commercially proven: people pay for being told first, particularly in finance, security, and specialist industries.
The plural is useful. It suggests a stream of moments rather than a single service, which suits a feed-based product better than a singular would.
Twelve characters, two plain words, no hyphen, .com, and both are universally understood. Nothing about the name needs explaining, which for a consumer news product is most of what a name has to do.
Available now. Offers considered.