CS2 Trade-Up Contracts Guide: Odds, Float, and Expected Value

How CS2 trade-up contracts work

A CS2 trade-up contract lets you submit ten skins of the same rarity to receive one skin from the next higher rarity. The output comes from eligible collections represented by the inputs. Because each collection can have different output counts, the exact set of inputs matters.

A simple contract can be easy to understand, but mixed-collection contracts need careful calculation. The best practice is to model the contract before buying inputs, then verify that the actual market prices still support the plan.

Expected value is not the same as profit

Expected value, or EV, is the average result if the same contract could be repeated many times at the same prices. A positive EV contract can still lose on a single attempt, and a negative EV contract can still hit a good outcome once. EV is a decision tool, not a guarantee.

For a realistic EV estimate, include input purchase cost, output sell price, marketplace fees, currency conversion, and liquidity. If an output is hard to sell, its listed price may overstate what you can actually realize.

Float planning can make or break a contract

Trade-up outputs use float math, so your input floats affect the output wear. If the target output must land in Factory New or Minimal Wear to be valuable, input float requirements become part of the cost. Cheap high-float fillers may make the contract look better until the output wear is calculated.

Use a trade-up calculator to test input floats, then compare the required input cost with the value of each possible output wear.

A safer trade-up research checklist

Good trade-up planning starts with the target collection and ends with liquidity checks. It is tempting to focus only on the best outcome, but the losing outcomes define the risk. If the bad outcomes are illiquid or overpriced in your data, the contract may be weaker than it looks.

CS2Insight's trade-up tools can help you structure the calculation, but you should still verify live market prices and availability before submitting a contract.

FAQ

Are CS2 trade-up contracts profitable?

Some contracts can show positive expected value at certain prices, but outcomes are uncertain and prices move. Profit is never guaranteed.

Why do trade-up odds change with collections?

The possible outputs are tied to the collections represented by the inputs. Mixed collections and output counts can change the final probability for each result.

Should I use cheap fillers in every CS2 trade-up?

Only if they support the odds and float requirements. Cheap fillers can lower cost, but bad float or weak output pools can hurt the contract.