This definately has a market, but i'm not sure SaaS is it. More typical eCommerce products have a "flavor of the day" like effect, where an article is written in some niche community, and everyone in that community rushes out to buy the thing. Then a few months later, the craze is over. If you're Amazon, you can spot these trends easily (because they have everyone's sales data from the marketplace). If you're a small eCommerce company, unless you just happen to have that product on hand, and someone just happened to have found you, you may never even realize the trend existed. Being alerted that there is a sudden demand for a product, might give you a headstart on marketing and might help you negotiate a deal with a supplier before the supplier realizes what they have.