MARKETPLACE ONLYNo longer in drop pool (removed Dec 2025)
Prisma Case
Case
CASE PRICE
$2.25
Steam Market floor
KEY PRICE
$2.49
Standard key
COST PER OPEN
$4.74
Case + key
EXPECTED VALUE
$3.59
Avg return per open
PROFIT / LOSS
$-1.15
Per open (EV − cost)
ROI
-24.2%
Return on investment
📉
NEGATIVE EXPECTED VALUE
Opening this case costs $4.74 but returns an average of $3.59 per open — a loss of $1.15 (24.2% negative ROI). The vast majority of CS2 cases have negative EV. Opening is entertainment, not investment.
DROP RATES & CONTENTS
79.92% mil spec15.98% restricted0.640% covert0.260% rare special3.20% classified
ABOUT THESE NUMBERS
Drop rates:Official — published by Valve via Perfect World (China) in September 2017 and verified across millions of community case openings.
StatTrak probability:10% — community-verified across tens of millions of openings. Not officially published by Valve.
Prices:Steam Market floor ask. Updated every ~4 hours. EV is a mathematical average — actual results vary greatly.
EV disclaimer:Nearly all cases have negative EV. Opening cases is entertainment, not a trading strategy. Never open cases expecting profit.