Steam Market API

A REST API for Steam Community Market prices — every CS2 and Rust item, swept continuously, with daily price history and the same item priced across 11 third-party marketplaces in one response. This is not Valve’s Steam Web API: it is an independent Steam market API built for trading sites, bots and marketplaces. Grab a free key or read the docs.

Is there an official Steam Market API?

There isn’t. Valve’s Steam Web API has no market-price methods, so most projects end up scraping the undocumented priceoverview and pricehistory endpoints behind the market pages. Those answer one item per request, throttle hard per IP, need a logged-in cookie for history, and return prices in whatever currency the cookie’s account uses. The Steam Subscriber Agreement also forbids automating the market itself.

This API takes the other route: it reads the public market continuously on its own infrastructure, normalises every price to integer minor units with an explicit currency, and serves the result from one documented endpoint with a key, a quota and a capture timestamp on every number. You never talk to Steam.

What the Steam market API returns

Example: one item, every market

curl "https://steamdataapi.com/api/v1/items/AK-47%20%7C%20Redline%20(Field-Tested)?game=cs2" \
  -H "Authorization: Bearer sdk_YOUR_KEY"

const name = encodeURIComponent('AK-47 | Redline (Field-Tested)');
const res = await fetch(`https://steamdataapi.com/api/v1/items/${name}?game=cs2`, {
  headers: { Authorization: 'Bearer sdk_YOUR_KEY' },
});
const item = await res.json();
console.log(item.prices.best, item.prices.bestSource); // cheapest venue right now

Prices are integers in minor units (cents) with a currency field beside them — never floats, never a bare number you have to guess the unit of. Add ?currency=EUR (or any of 30+ codes) to convert.

Steam is one source of 12

A Steam-only price is often not the real price: Steam’s 15% cut and its wallet-only balance push rare CS2 skins well below what they fetch elsewhere. Every item here also carries the lowest ask from Skinport, CSFloat, Buff163, DMarket, Waxpeer, Lis-Skins, SkinBaron, HaloSkins, WhiteMarket, YouPin898, C5Game, so you can show where it is actually cheapest, or the spread between venues, without integrating eleven APIs with eleven auth schemes.

CS2 and Rust

The CS2 skin API covers 31,393 items — including per-phase Doppler pricing, case and capsule drop tables, and float and pattern data on inventory reads. The Rust skin API covers 5,438 items from the survival game, priced from Steam and the handful of markets that actually list Rust. Pass ?game=cs2 or ?game=rust; the response shape is identical.

Beyond prices

The same key reads whole inventories: the Steam inventory API takes a public SteamID and returns every item priced, with a portfolio total. For ideas, see 5 things you can build with a Steam market API and why Steam undervalues rare CS2 skins.

Frequently asked questions

Start building

Free key, no card. Create one and make your first Steam market API call in a minute. Limits are on pricing; every endpoint is in the reference.