CS2 Composite Index

A CS2 index tracks how the prices of a whole category of items move: knives, gloves, agents, rifles, pistols, SMGs, heavy weapons, cases, and stickers. It works like a stock-market index: it starts at 1,000 points on 1 January 2021 and moves with the real sale prices of the items in its basket, each weighted by the dollars it trades. The line on each index page is that history, day by day.

From real sales, not listings. Every day we take each item's median sale price across the 20+ marketplaces we track. On the 1st of each month the basket is rebuilt from the previous 30 days: an item needs at least 5 sales and a price of $0.50 or more, and its weight is its share of the dollars traded, capped at 2% of the category. New items join 60 days after their first sale, so launch-week price drops do not drag the index. The index is chain-linked day to day, so items entering or leaving the basket never move it, and a day on which under 80% of the basket weight traded is held flat.

Every index adds yesterday's sales each night, and the basket is rebalanced on the 1st of each month. The item table on each category page uses live prices that refresh every few minutes per marketplace.

Market cap multiplies each item's price by an estimate of how many copies exist, then sums across the whole game; that is what /market-cap shows. An index does not count copies: it tracks the price level of a category, weighted by what actually trades, and is comparable across time because it is chain-linked from a fixed base. Use market cap for the size of the economy and the indexes for its direction.

Sales from the 20+ marketplaces CSMarketCap parses, pooled per item: Buff163, Youpin, CSFloat, DMarket, Skinport, Waxpeer, Market.CSGO and the rest. The Steam Community Market is kept as a separate line, because wallet prices there sit above cash prices; switch it on above any chart to compare the two.

Nine categories at launch: Agents (63 items), Knives (3,829 items), Gloves (469 items), Rifles (3,781 items), Pistols (3,359 items), SMGs (2,386 items), Heavy weapons (1,680 items), Cases (44 items), and Stickers (8,956 items). Each category has its own index page with chart history, breadth indicators (how many items are up vs down over 30 days), category-wide biggest gainer and biggest loser cards, and a sortable item table. Music kits, patches, charms, graffities, and other lower-volume categories are not indexed yet.

Indexes give you the macro view that individual item prices can't. If the Knives index is down six percent over 30 days, individual knife prices are probably down too — useful context before buying or selling a specific knife. The breadth indicators tell you whether a move is broad-based (all items down) or concentrated (only a few items tanking the average). The category cards on /indexes let you spot which categories are leading or lagging the overall CS2 market. Combine the index trend with the per-item price history page to make decisions that account for both the category direction and the specific item story.

The index is a category-wide aggregate; your item is one data point inside it. If your item moved differently from the category index, it's usually because of item-specific factors: rarity changes, esports performance affecting sticker prices, new operations adding to skin supply, float value, pattern index, or seasonal demand. Use the individual item page chart to see the per-item story, and the category index to put that story in context. Items at the extreme ends of a category (the cheapest agents, the most expensive knives) often diverge from the median index move.