A free, dupe-safe auction house for Paper and Folia 1.20.1–26.3 with Buy It Now, real bids, sale alerts, price insight and a cross-server market.
In-game screenshot: The market, with a listing's enchantments, price, seller and time left
In-game screenshot: An auction with a live bid
In-game screenshot: Shulker preview before buying
In-game screenshot: Five sort orders
In-game screenshot: Category and listing-type filters