Quantitative indices for the CS2 skin market
Five proprietary indices with S&P-style open methodology, monthly automatic rebalance, and 6-year backtest. Benchmark the market, not your inventory.
Same divisor-adjustment methodology used by S&P Dow Jones, Bloomberg Index Services, and MSCI for stock indices. No marketplace, no conflict of interest.
Built for quants — not for hype
4 methodological choices that separate research from marketing.
Auditable methodology
Every formula on /methodology. Replicate in Excel, audit the backtest, no black box.
View methodology →Multi-source coverage
Steam Market + DMarket + CSFloat aggregated. Full coverage, not sample.
View sources →Cross-asset benchmark
Compare STI to CDI, S&P 500, Bitcoin. Real asset class, not vibes.
Read analysis →Largest price changes
Skins that gained or lost the most in the latest windows — aggregate signal of market movement.
Gainers
Losers
Transparent methodology, in 3 steps
Picking the skins
Each index has clear rules a skin must pass to join: minimum price, minimum listings on Steam, and minimum price history. Stickers, capsules, and graffiti excluded — we only track skins that are actively traded.
How items are weighted
A skin's weight in the index is its price × how many copies are listed on Steam. Items that are both expensive AND easy to trade count more. Same method the S&P 500 uses for US stocks.
Rebalance
Every month the basket gets refreshed (every 3 months for STI 30) — old skins drop out, new ones enter. Same math trick the S&P 500 uses to keep the chart smooth across changes — no artificial jumps from the basket itself.
One tool, three audiences
Trader / Investor
See how far each index has dropped from its peak, how bumpy the ride was, and how it stacks up against safer alternatives. Plus a Screener to filter the ~30k tradable skins.
Open Screener →Analyst / Curious
Skin prices follow the CS2 player base closely — score of 0.77 on a 0-to-1 scale (1 = perfect lockstep). 6 years of history, public dataset via API, blog with deep dives.
See analysis →Collector
Track your CS2 collection: profit/loss in USD or BRL, breakdown by category, inventory synced via Steam login. See how your stash compares against the STI family.
View inventory →Top reads from the editorial
The 9 icons: why a curated CS2 skin basket returned 7x the broad index
9 hand-picked legacy CS2 skins (Howl, Dragon Lore, Fire Serpent) vs STI 30's +54%. Four scarcity mechanisms, the 10x player-base multiplier.
Pattern scarcity: why two AK-47 Case Hardeneds at the same float can be priced 100x apart
Doppler phases, Case Hardened blue gems, Crimson Web spiders. The framework, named patterns, data gaps.
Why CS2 skins underperformed equities (and when they shouldn't)
STI 30 +54.5% vs S&P 500 +154.4%. Three structural friction sources, three cases where it doesn't apply.
Want to filter and discover skins?
Screener with filters by price, listings, weapon and category — customizable ranking of the ~30k Steam-traded skins.