Features
A fuller tour is coming. Until then the front page has the complete list, and marks what is built from what is planned.
Built today: watches with a price limit, push alerts on restock, Fetch in your own browser, price history against reseller and TCGplayer prices, restock and sell-out reports with weekday patterns, and collector health.
Planned: Guaranteed Offers and funded acquisitions. Neither is implemented, and neither is described anywhere on this site as though it were.