- Cost
- $202.75
- EV
- 58%
- $117.18
- Profit
- −$100.85
- after fee
- Win %
- 0%
- to profit
Avg float ≤ 0.279 (needs < 0.280)2 outcomesActive market
Reverse trade-up finder
Trade up to USP-S | Serum
10 Restricted skins from the CS:GO Weapon Case 2 collection can become USP-S | Serum. Pick a wear to see every realistic route, its odds, cost and the input float it needs.
Prices as of Oct 27, 2026Steam Community Market averages · snapshot 2026-10-27 10:25 UTC
Factory New USP-S | Serum needs an average normalized input float below 0.2800 (output float 0.000–0.070). Best chance per contract: 50.0%.
- Cost
- $68.37
- EV
- 76%
- $52.17
- Profit
- −$23.00
- after fee
- Win %
- 40%
- to profit
Avg float ≤ 0.277 (needs < 0.280)5 outcomesActive market
- Cost
- $22.54
- EV
- 74%
- $16.70
- Profit
- −$8.02
- after fee
- Win %
- 10%
- to profit
Avg float ≤ 0.275 (needs < 0.280)5 outcomesActive market
- Cost
- $22.84
- EV
- 73%
- $16.58
- Profit
- −$8.42
- after fee
- Win %
- 10%
- to profit
Avg float ≤ 0.277 (needs < 0.280)5 outcomesActive market
- Cost
- $24.20
- EV
- 81%
- $19.67
- Profit
- −$7.10
- after fee
- Win %
- 10%
- to profit
Avg float ≤ 0.277 (needs < 0.280)5 outcomesActive market
- Cost
- $28.71
- EV
- 84%
- $24.21
- Profit
- −$7.66
- after fee
- Win %
- 10%
- to profit
Avg float ≤ 0.279 (needs < 0.280)5 outcomesActive market
Required input float for each USP-S | Serum wear
| Wear | Output float | Avg normalized input float | Cheapest route | Best chance |
|---|---|---|---|---|
| Factory New | 0.000–0.070 | < 0.2800 | $22.54 | 50.0% |
| Minimal Wear | 0.070–0.150 | ≥ 0.2800 and < 0.6000 | $18.59 | 50.0% |
| Field-Tested | 0.150–0.250 | ≥ 0.6000 and any | $26.48 | 50.0% |
| Well-Worn | Not possible — outside this skin's 0.00–0.25 float range | |||
| Battle-Scarred | Not possible — outside this skin's 0.00–0.25 float range | |||
The average is over every input's float normalized to its own range. Output float = 0.00 + average × 0.25.
Other trade-up targets in this collection
How CS2 trade-up contracts work
Inputs & odds
10 skins of one rarity become 1 skin of the next rarity (Mil-Spec → Restricted → Classified → Covert). Since the October 2025 update, 5 Covert skins can become a knife or gloves from those skins' case. Each input collection gets its share of the odds (inputs from it ÷ total), split evenly across that collection's next-tier skins.
Float math
Every input float is normalized to its own skin's range — (float − min) ÷ (max − min) — and averaged. Each output's float is its min + average × (max − min), so a restricted-range skin like 0.10–0.20 can only land in the wears its range allows.
Prices, fees & freshness
Values are Steam Community Market averages from the snapshot dated on each page. Profit subtracts the ~13% Steam seller fee. StatTrak™ inputs give StatTrak™ outputs (knives only — gloves have no StatTrak™). Map collections outside weapon cases aren't in DropLabz's dataset yet.
Pick the skin you want in the reverse trade-up finder, check any contract in the trade-up calculator, or compare with opening cases on case ROI and knife odds.