Developer API

CS2 Marketindex API

Suivez le marché CS2 agrégé — valeur d'index actuelle, historique complet, et comparaison côte-à-côte sur chaque marketplace couvert.

Endpoints

All endpoints return JSON, accept the same auth header, and degrade with a normalised error envelope.

GET /steam/api/market-index/cs2

GET /steam/api/market-index/cs2/history

GET /steam/api/market-index/cs2/compare

Same auth header as every other endpoint we ship. Get an API key from the dashboard and you're querying inside two minutes.

API Request

# curl with API key

curl "https://www.steamwebapi.com/steam/api/market-index/cs2?key=$KEY"

# PHP

$res = file_get_contents('https://www.steamwebapi.com/steam/api/market-index/cs2?key=' . $KEY);

$data = json_decode($res, true);

# Node.js

const r = await fetch(`https://www.steamwebapi.com/steam/api/market-index/cs2?key=${KEY}`);

const data = await r.json();

La Marketindex API calcule un index pondéré sur l'économie CS2 : un nombre unique qui capture si le marché monte ou descend.

How is the index calculated?

Volume-weighted average of the top liquid CS2 items, rebalanced periodically. Snapshot-based so historical comparisons stay consistent.

Can I see history?

Yes — /steam/api/market-index/cs2/history returns the index as a time series.

Can I compare marketplaces?

Yes — /steam/api/market-index/cs2/compare returns the per-marketplace index side by side.

One key, every Steam endpoint.