The original real-money Auction House was permanently shut down years ago. Today, items of Legendary or Set quality on PC are strictly upon dropping.
Because you can't simply buy an item and have it traded directly to your inventory on PC, third-party sites utilize different fulfillment methods: buy d3 items
On non-seasonal console profiles, restrictions are looser. However, on PC and in all Seasonal modes, trading is highly locked down. How Third-Party "Buying" Actually Works The original real-money Auction House was permanently shut
You can only trade a legendary drop directly to another player if they were present in your active game party when the item dropped, and only for up to 2 hours. restrictions are looser. However