What Stayed the Same from CSGO to CS2
The fundamental trade-up mechanics carried over intact from CSGO to CS2:- 10 input skins of the same rarity tier (unchanged)
- Output rarity is one tier higher (unchanged)
- Float formula: The adjusted float normalization → averaging → output mapping formula is identical
- Collection weighting: Output pool is still determined by input collections, weighted by representation
- StatTrak rules: All-StatTrak inputs produce StatTrak output; no mixing allowed
- Steam marketplace fees: Still 13% (5% Steam + 8% game fee) when selling outputs
- No Souvenir trade-ups: Souvenir skins still cannot be used in trade-up contracts
If you understood trade-ups in CSGO, the core knowledge transfers directly. The float math, probability calculations, and EV analysis all work exactly the same way. Your CSGO trading strategies remain valid in CS2.
What Changed in CS2 Trade-Ups
Several meaningful changes accompanied the transition to CS2 and subsequent updates:New Collections and Cases
CS2 has introduced numerous new collections (Kilowatt, Revolution, Recoil, and more) with their own skin pools. Each new collection creates new trade-up paths and opportunities. Some CSGO collections are no longer actively dropping from cases, making their skins rarer and potentially shifting trade-up economics.
Market Migration
When CS2 replaced CSGO, the entire skin market migrated. All existing CSGO skins became CS2 skins. This caused a period of price volatility as the market rebalanced. Skins from CSGO-era collections are still fully usable in CS2 trade-ups.
UI and Inventory Changes
The CS2 inventory interface and trade-up contract UI received visual updates but the underlying mechanics are the same. The contract still requires 10 skins of the same rarity, and the execution process is identical.
Third-Party Tool Ecosystem
The shift to CS2 broke many CSGO-era trade-up calculators and skin databases. Skin data APIs updated to CS2 formats, and new tools like TradeUpX were built specifically for the CS2 ecosystem with updated skin catalogs and price feeds.
The October 2025 Knife Trade-Up Update
The biggest change to trade-ups since their introduction came in October 2025: Covert → Gold Special Item trade-ups.What Was Added
- A new trade-up tier: Covert (Red) → Gold (Special Items)
- Only 5 Covert skins required (not 10)
- Output is a knife or pair of gloves from the same collection(s)
- Float formula and collection weighting still apply
- StatTrak Covert inputs produce StatTrak knife/glove outputs
Market Impact
This update transformed the CS2 skin economy. Covert skin prices across all collections immediately increased as demand surged for knife trade-up inputs. Collections with desirable Gold-tier knives (Butterfly, Karambit) saw the largest Covert price increases. Every knife trade-up permanently removes 5 Covert skins from circulation, creating ongoing supply pressure.
For traders migrating from CSGO knowledge, this is the single most important development to understand. Knife trade-ups have fundamentally changed the value proposition of Covert skins and opened an entirely new profit tier.
Collection Compatibility: CSGO Skins in CS2 Trade-Ups
One of the most common questions from migrating CSGO players is whether their old skins still work in trade-ups:Full Backward Compatibility
All CSGO-era skins that were tradeable and usable in trade-ups continue to work in CS2. Your old Mil-Spec, Restricted, Classified, and Covert skins from CSGO collections can be used in CS2 trade-up contracts without any issues.
Cross-Generation Mixing
You can mix CSGO-era collection skins with CS2-era collection skins in the same trade-up contract, as long as they are the same rarity tier. The collection weighting rules apply normally — the game does not distinguish between "old" and "new" collections.
Discontinued Collections
Some CSGO collections no longer drop from active cases. Skins from these collections still work in trade-ups, but their supply is fixed and declining. This makes them potentially more valuable as trade-up inputs over time, especially if the collection's output pool contains desirable skins at the next tier.
TradeUpX includes both CSGO-era and CS2-era collections in its scanner database. All collections with valid trade-up paths are evaluated when you run a scan, regardless of when they were originally released.