Why does it say the inventory is not available?

Steam only shares an inventory that is set to Public. The owner can change it under Steam - Edit Profile - Privacy Settings - Inventory. It can also mean the account holds no Rust skins.

How are the skins priced?

At the same canonical price the whole wiki uses: Steam's lowest sell order for the skin, or the highest buy order when nothing is listed. Skins with no Steam market listing show as unpriced and count as $0.

How fresh is the data?

A fresh read from Steam is kept for 24 hours; the Reload link forces a new read. Prices are always today's.

Is the Rust inventory value accurate?

It is what the inventory is worth on the Steam Community Market right now, which is what almost everyone means by inventory value. What you would actually receive in a sale is lower: Steam takes roughly a 15% fee on every market sale, and thinly traded skins can take a long time to sell at the listed price.

Do I need to log in or send a trade offer?

No. Everything is read from public Steam data, so there is no login, no API key and no trade URL - which is also why you can check anyone's inventory, not just your own. It is free with no cap.

Can I see what an inventory looked like before?

Yes. Every day an inventory is checked, a snapshot of its items and that day's prices is saved; pick a date on the result page to view it. The value chart also has longer ranges and a custom date range.

Can I use this from code?

Yes - the rust.wiki API exposes the same lookup at /api/v1/inventory/{steamid} with an API key.

Rust 库存价值计算器

粘贴 Steam 个人资料链接、自定义 URL 名称或 SteamID64，即可按本百科其他部分使用的同一套 Steam 实时价格，为该账号的 Rust 皮肤估值。库存必须在 Steam 上设为公开。免费，无需登录，无需交易报价。

指南： Steam 交易限制：为什么无法交易以及如何查询

已查询的库存

58,643

已查询的总价值

$18,870,027.09

最有价值的 Rust 库存

第 180 页，共 2933 页

#	玩家	物品	价值
3581	TTV: Marechal_Tealer	486	$1,131.80
3582	ᴴᵉˣ ᴿⁱˢᵏ	255	$1,131.68
3583	Tullerusk	314	$1,131.53
3584	VanHudgens	441	$1,131.25
3585	Lynyrd Zynyrd	563	$1,131.01
3586	Bellamy	324	$1,130.73
3587	swoopsツ	464	$1,130.52
3588	Mike Mayhem	345	$1,129.88
3589	PaYa	130	$1,129.86
3590	Cabbage Kicker	463	$1,129.83
3591	Cheetah	642	$1,129.60
3592	N6st	75	$1,129.03
3593	catlover83	133	$1,128.94
3594	大吊 Ford	343	$1,128.87
3595	pp	144	$1,128.66
3596	cruxey	483	$1,128.58
3597	SamHain Hallow	425	$1,128.26
3598	m0v3	385	$1,128.24
3599	Sphongle	224	$1,127.98
3600	1738	146	$1,127.57