List items for sale

Puts backpack items on the market. Every listing holds exactly one copy: each group in listings is a price in cents and the items to sell at it, and every copy in the group becomes its own listing. items holds backpack item ids (the id from GET /public/v1/backpack) with the quantity of each to sell, so amount: 5 creates 5 listings. The response lists every listing created. A commodity backpack row is a quantity rather than a single copy, so the same id may appear in several groups to sell copies at different prices; the groups draw from one pool, and asking for more than the row's amount in total fails with INSUFFICIENT_ITEMS. At most 50 groups per request, 50 items per group. Send price_decay instead of price on a group to list it with an auto-decaying price: it starts at start_price and falls to end_price over total_hours (24-168). To sell something still sitting in Steam, use POST /public/v1/sell instead. Accounts have a ceiling on how much they can have listed at once; past it, listing fails with LISTING_LIMIT_REACHED. Contact support if you are hitting it. While listing is switched off site-wide, the call fails with LISTING_DISABLED.

Response Body