csl-backend

Price engine powering the CSL perpetuals terminal

Live CS2 skin market data for csl.fun: curated markets, real-time prices, OHLC candles, funding rates and a Server-Sent-Events stream.

Endpoints

Method	Path	Returns
GET	/health	status, active price source
GET	/api/markets	all markets — price, 24h change, funding
GET	/api/markets/:key	single market
GET	/api/candles/:key	live OHLC series (1m base)
GET	/api/history/:key	full daily history (real Steam Market data)
GET	/api/inventory/:steamid	public CS2 inventory, CSL-tradable items flagged
GET	/api/stream	SSE — snapshot + live price ticks

Price sources

→ Skinport — live lowest-listing prices, free public API, no key
→ Steam Market — full daily price history back to each skin's release
→ lis-skins — optional live source (API key required)
→ SOURCE=mock — deterministic simulated feed for local dev

Run

npm install
npm start                 # mock feed
SOURCE=skinport npm start # live prices

All configuration via env — see .env.example.

— csl.fun · docs.csl.fun · @csldotfun