Identifiers

Steam Market routes combine catalog-level and owner-specific identifiers.

Identifier	Scope	Notes
`appid`	Application	`730` is Counter-Strike 2, `440` is Team Fortress 2, and `753` is Steam Community.
`market_hash_name`	Market catalog	Locale-independent item name used by listing and pricing routes. URL-encode it as a path or query component.
`item_nameid`	Market order book	Internal numeric ID used by histogram and activity routes. It is not the class ID.
`classid`	Description class	Groups assets sharing a description.
`instanceid`	Description variant	Distinguishes variants within a class. Often `0`, but not always.
`assetid`	Owned asset	Identifies one asset for one owner. Appears on listing rows and changes after transfers.
`listingid`	Sell listing	Identifies a specific Market listing.
`buy_orderid`	Buy order	Identifies an account's buy order.
`market_bucket_id`	Structured Market bucket	Opaque bucket identifier returned by newer structured endpoints.
`market_bucket_group_id`	Structured Market group	Opaque group identifier. Listing paths can also use `G…` group names.

Item name ID

item_nameid is required by the classic itemordershistogram and itemordersactivity routes. It is normally embedded in listing-page state. Do not substitute classid, assetid, or a hash of market_hash_name.

Prices

Structured Market fields such as unPrice, unFee, price_total, and price are integer minor units for the selected Steam currency. Formatted strings such as lowest_price, median_price, and strSubtotal include the localized currency presentation.

Do not parse formatted strings when an integer amount is available.