Steam Inventory API

Read any public Steam inventory for CS2 or Rust as clean JSON: every item identified, priced from Steam and 11 marketplaces, with float, paint seed and Doppler phase for CS2 — and a total for the whole inventory. One request, no inspect links, no Game Coordinator of your own. Grab a free key or read the endpoint docs.

Not the Steamworks Inventory Service

Searching for a Steam inventory API mostly turns up Valve’s Inventory Service — a Steamworks feature for developers granting and consuming items inside their own game. Useful if you ship a game; useless if you want to know what is in someone’s CS2 inventory and what it is worth.

The other thing people find is the raw steamcommunity.com/inventory/{id}/730/2 JSON: public, but rate-limited per IP, unpriced, paginated, and with none of the float or pattern data that decides a skin’s value. This API sits on top of that problem: it reads the inventory for you, resolves every item against the catalog, attaches prices from 12 sources and the CS2 inspect data, and returns one document.

What comes back per item

Example: value a whole inventory

curl "https://steamdataapi.com/api/v1/inventory/76561198000000000?game=cs2&currency=EUR" \
  -H "Authorization: Bearer sdk_YOUR_KEY"

const res = await fetch(
  'https://steamdataapi.com/api/v1/inventory/76561198000000000?game=cs2',
  { headers: { Authorization: 'Bearer sdk_YOUR_KEY' } },
);
const { totalValue, items } = await res.json();
// totalValue: the inventory in cents; items[]: each skin with float, phase and prices

Private inventories, caching and freshness

Only public inventories can be read — the same rule Steam applies — and a private one answers with an explicit error code, never a silently empty list. Reads are cached for a short window so a page refresh does not turn into a Steam request; pass fresh=1 when you need to confirm that a trade has actually landed.

Rust inventories too

The same endpoint reads Rust inventories with ?game=rust: every skin, door, weapon and building part priced from Steam and the markets that carry Rust, with a portfolio total. See the Rust skin API for what is covered.

Build on it

Two walkthroughs start from this endpoint: how to build a CS2 inventory value calculator and reading float, pattern and Doppler phase straight from an inventory. Prices come from the Steam market API; the full field list is in the inventory reference.

Frequently asked questions

Start building

Free key, no card. Create one, drop in a SteamID64 and get the inventory back priced. Inventory is its own endpoint group with its own quota — see pricing.