How TF2TradeUps.com works

Contract odds

Every input contributes 10% probability to its collection. That collection share is split evenly across its next-grade outcomes. Mixed contracts therefore preserve the exact collection weighting of the ten inputs.

Price snapshots

Backpack.tf mode values inputs from the lowest eligible, clean sell listing and outputs from the highest eligible, clean buy order. Steam mode prefers the lowest sell listing for inputs and highest buy order for outputs. Missing Steam quotes may use a clearly marked backpack.tf conversion estimate.

The browser checks the published live-data file every five minutes. The server-side price pipeline has its own refresh schedule, so a five-minute check does not mean every item was newly quoted in that interval. The exact market-check timestamp is shown in the app.

Limits

Opportunity Board rows are theoretical rankings based on one cheapest ask multiplied by ten. Listing depth, availability, Steam fees, taxes and slippage are not included. War Paint and decorated-weapon wear markets can be thin; always verify the exact item and wear before trading.