Developer API

CS2 Marketindex API

Track the aggregate CS2 market — current index value, full history, and side-by-side comparison across every marketplace we cover.

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CS2 Marketindex API endpoints

All endpoints return documented responses and use the same Steamwebapi key parameter.

GET /steam/api/market-index/cs2

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

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

CS2 Marketindex API — quickstart

Use the same Steamwebapi key parameter as every other documented endpoint. Get an API key from the dashboard and send your first request in minutes.

→ One API key, documented responses.
→ Rate limits scale with your plan tier.
→ Full schema in the API Reference.

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();

About this API

The Marketindex API computes a weighted index across the CS2 economy: a single number that captures whether the market is up or down. Use it as a benchmark for portfolio performance, a market-state input for trading bots, or a chart on a community dashboard.

Three endpoints: current value, time series history, and per-marketplace comparison. Same auth header, same DTO style.