CS2 trade-up contracts let you combine ten skins of the same rarity into one output of the next tier up — but the math is brutal. Most random contracts lose money. The profitable ones require exact input matching, correct float calculations, and price sourcing across Buff163, CSFloat, Skinport, and Steam. Trade-up scanners automate that search, surfacing positive-expected-value (positive-EV) contracts before you buy a single input skin.
This guide compares five trade-up ROI scanners and arbitrage tools in August 2026 — TradeUpX, SkinScope, CS.NOW, CS2 Trade-Up Simulator, and CSGOTrader — covering fill matching algorithms, cross-platform pricing, browser extension inventory valuation, and risk assessment.
How Trade-Up Contracts Work (Quick Refresher)
| Rule | Detail |
|---|---|
| Input count | Exactly 10 skins of the same rarity tier |
| Output tier | One skin exactly one rarity above the inputs |
| Collection logic | Outputs come from collections represented in the input pool, weighted by count |
| Float calculation | Output float = average input float × (max_out − min_out) + min_out |
| StatTrak | All inputs must be StatTrak to get a StatTrak output |
| Knife/glove trade-ups | Covert inputs → gold (knife/glove) from the same case pool |
The profit question is straightforward: does the probability-weighted value of all possible outputs exceed the total cost of ten input skins? Scanners answer that across thousands of collection combinations in seconds.
Why Cross-Platform Pricing Creates Arbitrage
Input skins and output skins rarely cost the same on every marketplace. A Restricted skin might be $0.80 on Buff163 but $1.40 on Skinport. A Classified output might sell for $12 on CSFloat but $9 on Steam Market.
| Arbitrage pattern | Example |
|---|---|
| Buy inputs cheap (Buff163) | Source ten Restricted inputs at Chinese-market prices |
| Sell outputs high (Western P2P) | List the Classified output on CSFloat or Skinport |
| Fee-adjusted margin | Subtract 2–15% marketplace fees before calling it profit |
| Float-tier premium | Low-float outputs command 20–200% above average listings |
Scanners that pull multi-market prices let you model the arbitrage path before committing capital. Tools limited to Steam Market prices will miss most real-world profit opportunities.
Tool Comparison at a Glance
| Tool | URL | Positive-EV scan | Multi-market prices | Inventory integration | Fill matching | Float calc | Browser extension |
|---|---|---|---|---|---|---|---|
| TradeUpX | tradeupx.app | Yes — live profit feed | Buff163 + Western | Steam inventory import | Auto-fill suggestions | Yes | No |
| SkinScope | skinscope.games | Yes — contract explorer | Multi-market | Partial | Collection-aware matching | Yes | No |
| CS.NOW | cs.now | Yes — profit scanner | Steam + third-party | Inventory scan | Smart fill algorithm | Yes | No |
| CS2 Trade-Up Simulator | cstradeupsimulator.com | Simulation-focused | Steam Market | No | Manual input selection | Yes | No |
| CSGOTrader | csgotrader.app | Via extension trade-up tab | Multi-market | Full Steam inventory | Extension-assisted | Yes | Yes (Chrome/Firefox) |
TradeUpX — Live Profit Feed for Active Traders
URL: tradeupx.app
TradeUpX is built for traders who want a continuously refreshed feed of profitable trade-up contracts. It scans collection combinations, calculates expected output values, and ranks contracts by ROI percentage and absolute profit.
Key features
- Live profit feed — contracts sorted by expected profit, refreshed as marketplace prices shift.
- Buff163 + Western pricing — model buying inputs on Chinese markets and selling outputs on Western P2P platforms.
- Steam inventory import — see which contracts you can fill with skins you already own.
- Auto-fill suggestions — recommends cheapest valid inputs for a target output skin.
- Collection breakdown — shows exactly which collections contribute to each possible output and at what probability.
Pros and cons
| Pros | Cons |
|---|---|
| Strongest live profit feed among dedicated scanners | Smaller community vs. CSGOTrader |
| Buff163 arbitrage modeling built in | UI less polished than CSDelta ecosystem |
| Inventory-aware contract matching | No browser extension for in-client valuation |
| Free access to core scanning | Advanced filters may require account |
Best for: Active traders hunting positive-EV contracts with cross-market arbitrage, especially Buff163 input sourcing.
SkinScope — Collection-Aware Contract Explorer
URL: skinscope.games
SkinScope focuses on deep contract exploration — understanding which collections mix into which outputs, how float ranges affect profitability, and where the probability mass sits across possible results.
Key features
- Contract explorer — browse trade-ups by target output skin, input collection, or rarity tier.
- Multi-market price integration — input and output prices from several sources.
- Probability visualization — see the full output distribution, not just the highest-EV outcome.
- Float range modeling — calculate expected output float and resulting wear tier.
- Historical contract tracking — monitor how profitability shifts as skin prices move.
Pros and cons
| Pros | Cons |
|---|---|
| Best probability visualization for multi-output contracts | Less emphasis on live profit feed vs. TradeUpX |
| Collection-aware fill matching | Inventory integration less mature |
| Good for learning trade-up mechanics | Smaller brand recognition |
| Clean explorer UI for research | No browser extension |
Best for: Players learning trade-up mechanics who want to understand collection weighting and output probability before executing contracts.
CS.NOW — Profit Scanner with Inventory Scan
URL: cs.now
CS.NOW combines a trade-up profit scanner with broader CS2 market tools — price tracking, inventory valuation, and contract profitability in one dashboard.
Key features
- Profit scanner — ranks trade-up contracts by expected return.
- Inventory scan — upload or link your Steam inventory to find fillable contracts.
- Smart fill algorithm — suggests optimal input combinations for a target output.
- Price tracking integration — see how input/output prices trend over time.
- Float calculation — models output wear based on average input float.
Pros and cons
| Pros | Cons |
|---|---|
| Unified dashboard for scanning + inventory + prices | Trade-up depth below dedicated tools like TradeUpX |
| Smart fill reduces manual input selection | Buff163 arbitrage modeling less explicit |
| Good for casual traders starting with trade-ups | Smaller documentation community |
| Free core features | Multi-market coverage narrower than TradeUpX |
Best for: Players who want trade-up scanning alongside general market tools without switching between multiple sites.
CS2 Trade-Up Simulator — Manual Contract Testing
The CS2 Trade-Up Simulator is a focused testing environment. Pick ten input skins manually, set their floats, and simulate the contract outcome — including the full probability distribution of possible outputs.
Key features
- Manual input selection — choose exact skins and floats for precise contract modeling.
- Outcome simulation — run the contract thousands of times to see variance vs. expected value.
- Float and wear modeling — see how input float averages map to output wear tiers.
- Steam Market pricing — baseline cost calculations from Steam listings.
- Educational focus — understand trade-up mechanics through hands-on experimentation.
Pros and cons
| Pros | Cons |
|---|---|
| Best for testing specific contracts you've already planned | No automated positive-EV scanning |
| Simulation mode shows variance, not just EV | Steam Market prices only — misses arbitrage |
| Simple, focused UI | No inventory integration |
| Free, no account required | No browser extension |
| Good learning tool for trade-up math | Less useful for active profit hunting |
Best for: Players who already have a contract in mind and want to simulate outcomes and understand variance before executing.
CSGOTrader — Browser Extension with Instant Inventory Valuation
URL: csgotrader.app
CSGOTrader is primarily a browser extension that enhances Steam Community Market and trading pages. Its trade-up tab evaluates your existing inventory for profitable contracts without leaving Steam.
Key features
- Chrome/Firefox extension — overlays pricing, trade-up value, and profit indicators directly on Steam pages.
- Instant inventory trade-up valuation — scans your inventory and highlights fillable positive-EV contracts.
- Multi-market price comparison — shows prices across several marketplaces inline.
- Trade offer assistant — helps evaluate incoming trade offers for fair value.
- Float and pattern data — displays item details on market listings.
Pros and cons
| Pros | Cons |
|---|---|
| Only tool with full in-browser Steam integration | Extension-only — no standalone scanner dashboard |
| Instant inventory valuation while browsing Steam | Trade-up scanning less deep than TradeUpX |
| Huge user base and community trust | UI overlays can feel cluttered on small screens |
| Multi-market comparison on every listing | Profit feed not as continuously refreshed |
| Free core extension | Some advanced features require Patreon support |
Best for: Traders who live on Steam Community Market and want instant trade-up valuation without opening a separate scanner site.
Fill Matching Algorithms: What Separates Good Scanners
The hardest part of trade-up execution is finding ten valid inputs at the lowest combined cost. Good scanners solve this with fill matching:
| Algorithm feature | What it does |
|---|---|
| Collection constraint solver | Ensures inputs include the collections needed for your target output |
| Cheapest-fill optimizer | Finds the lowest-cost ten skins that satisfy collection requirements |
| Float-range targeting | Selects inputs whose average float produces FN or MW output wear |
| StatTrak consistency | Filters to all-StatTrak or all-normal inputs as required |
| Marketplace routing | Suggests where to buy each input cheapest |
TradeUpX and CSGOTrader lead on automated fill matching. CS2 Trade-Up Simulator requires manual selection but gives the most control.
Risk Assessment: What Can Go Wrong
Even positive-EV contracts carry real risks:
| Risk | Mitigation |
|---|---|
| Price movement | Input or output prices shift between scan and execution — recheck before buying |
| Liquidity | Profitable on paper but output skin has no buyers at listed price |
| Float variance | Average float math is deterministic, but input float selection errors produce wrong wear |
| Collection rule changes | Valve has not changed trade-up rules since 2017, but always verify against current game state |
| Marketplace fees | 2–15% fees can flip a marginal contract from profit to loss |
| Bot/scam inputs | Buy inputs only from reputable marketplaces with buyer protection |
Rule of thumb: Only execute contracts with >10% expected profit after fees to absorb price movement and liquidity risk. Marginal 1–3% contracts often become losses by the time you acquire all ten inputs.
Feature Matrix: Which Tool for Which Job
| Use case | Recommended tool |
|---|---|
| "Show me profitable contracts right now" | TradeUpX live feed |
| "I want to understand collection probability" | SkinScope explorer |
| "Scan my inventory for fillable trade-ups" | CSGOTrader extension or CS.NOW |
| "Test a specific contract before buying inputs" | CS2 Trade-Up Simulator |
| "Buy inputs on Buff163, sell on CSFloat" | TradeUpX arbitrage modeling |
| "Evaluate trade-ups while browsing Steam" | CSGOTrader extension |
| "Learn how trade-ups work from scratch" | SkinScope + CS2 Trade-Up Simulator |
The Bottom Line
Profitable CS2 trade-ups require three things: correct collection math, accurate multi-market pricing, and efficient input fill matching. TradeUpX leads for live profit scanning and Buff163 arbitrage. CSGOTrader wins for instant inventory valuation via browser extension. SkinScope and CS.NOW fill the research and dashboard niches. CS2 Trade-Up Simulator remains the best sandbox for testing specific contracts.
For most traders, the workflow is: scan for positive-EV contracts on TradeUpX, verify fill availability with CSGOTrader's inventory tab, simulate the exact contract on CS2 Trade-Up Simulator, then execute inputs from the cheapest marketplace. Never run a contract based on Steam Market prices alone — the arbitrage between Buff163 inputs and Western output sales is where the margin lives.
