Metamarkets delivers predictive analytics to the world's leading digital publishers. Each day, we analyze billions of online advertising events. Our web-based product provides (i) automated detection of sudden changes in revenue, volume, and pricing, (ii) filtering and drill-down across audience, context, and advertiser attributes, and (iii) forecasts for future traffic and advertiser demand. These web services are powered by our custom Big Data stack: an event-driven visualization framework and a distributed in-memory data platform.