From Team Fortress Wiki
TF2 Warehouse (TF2WH) is a trading site for items in Team Fortress 2. Instead of trading items to other players, TF2WH buys items from players in exchange for credits that may be spent on other items.
TF2 Warehouse gives every item a value in credits and enables players to buy items with credits and sell items for them. All items that are sold on the site are added to the central repository from which they are resold again. This system enables players to purchase and receive items almost immediately if they are available, similar to the Mann Co. Store, and in contrast with conventional trading where the player must locate a seller manually and debate over a price.
To trade items, TF2 Warehouse utilizes a bot program and a number of Steam accounts to track and store items for sale. Trading is implemented through a queuing system. Once players sign into the site via Steam OpenID and select to trade, they are added to the queue and await a friend request from one of TF2WH Steam bots. Via Steam Trading, the bot will send the player's selected items and will accept the trade. Players can also buy and sell items in the one transaction, although if purchasing multiple items from TF2WH, it is unlikely that they will receive all items at once, since items are distributed across the site's multiple backpacks.
Items are listed on the site in order of their addition to the warehouse. Players can reserve an item, which puts the item aside for up to two hours.
Pricing and currency
TF2 Warehouse uses a currency of credits (abbreviated as 'c', e.g. 400c indicates 400 credits) and each item in the game is given a value in credits. Players were given 500 credits once when signing up during beta. The minimum cost for items is 200 credits, with hats starting at 5,000c, and the Unusual quality hats ranging upwards from 1,000,000+ credits.
Base conversion rates for items are listed below.
|Mann Co. Supply Crate Key||11,200c|
|Max's Severed Head||430,000c|
- Please note, the prices listed above are at "Buying Price" and not "Selling Price", the former being slightly less.