CS2 Skins — Trade-Up Contract Finder

Daemon that automatically finds profitable CS2 trade-up contracts across multiple markets. Analyzes collections, calculates output float/wear, and sends Telegram alerts when a guaranteed-profit trade-up is found.

How It Works

1. Fetches the full CS2 collections graph from CSGO-API
2. For each collection and rarity tier:
   • Finds the 10 cheapest input skins of that rarity
   • Calculates the output float using the CS2 formula: output_float = avg_input_float × (max - min) + min
   • Determines the output wear (FN/MW/FT/WW/BS) based on calculated float
   • Looks up the market price for each possible output at its actual wear
3. Only alerts if worst-case output is profitable (cheapest possible result still makes money)
4. Validates against Steam median prices (inputs must be below Steam, outputs must be at/above Steam)
5. Requires an offer buffer — each input skin must have extra offers beyond the 10 needed

Trade-Up Formula

CS2 trade-up takes 10 skins of the same rarity → 1 random skin of the next rarity from the same collection(s).

Output float = average_input_float × (skin_max_float - skin_min_float) + skin_min_float

The daemon uses average float per wear tier (e.g., FT = 0.265) for calculations.

Dependencies

• Node.js >= 18
• better-sqlite3 — reading offer databases
• dotenv — configuration

Related Repositories

Repository	Purpose
cs2_skins_trading_database	Database schemas and init scripts
cs2_skins_trading_offers_parse	Fills offer databases
cs2_skins_trading_arbitrage	Arbitrage bot + Steam prices

Installation

cd cs2_skins_trading_tradeup
npm install
cp .env.example .env
nano .env

Configuration (.env)

Variable	Description	Default	Where to get
TG_BOT_TOKEN	Telegram bot token	—	@BotFather → /newbot
TG_CHAT_ID	Telegram chat ID	—	@userinfobot
DMARKET_OFFERS_DB_PATH	Path to DMarket offers DB	../database/offers_dmarket.db	Filled by offers_parse/dmarket.js
WHITEMARKET_OFFERS_DB_PATH	Path to WhiteMarket offers DB	../database/offers_whitemarket.db	Filled by offers_parse/whitemarket.js
MIN_PROFIT_USD	Minimum worst-case profit in USD	1.0	—
MIN_INPUT_PRICE_USD	Minimum input skin price (filters junk)	0.10	—
MIN_OFFERS_BUFFER	Extra offers required beyond the 10 needed	3	—
MAX_ALERTS	Max alerts per cycle (anti-spam)	20	—
DEDUP_TTL_MS	Don't repeat same trade-up alert (ms)	14400000 (4h)	—
LOOP_SLEEP_MS	Pause between full cycles (ms)	600000 (10min)	—
COLLECTIONS_REFRESH_MS	Refresh collections catalog (ms)	86400000 (24h)	—
OFFER_MAX_AGE_SEC	Max offer age to consider fresh (sec)	7200 (2h)	—
STEAM_PRICES_DB_PATH	Path to Steam prices DB	../database/steam_prices.db	Filled by arbitrage/steam_prices.js
STEAM_MAX_RATIO	Input price must be below steam × ratio	0.9	—
STEAM_MIN_OUTPUT_RATIO	Output price must be above steam × ratio	1.0	—
REQUIRE_STEAM_PRICE	Skip items without Steam price (1/0)	1	—

Running

# Direct
node tradeup.js

# PM2 (recommended)
pm2 start tradeup.config.cjs
pm2 save

Debugging

pm2 status tradeup-daemon
pm2 logs tradeup-daemon --lines 50
tail -20 logs/tradeup.out.log
tail -20 logs/tradeup.err.log
pm2 restart tradeup-daemon

File Structure

tradeup/
├── tradeup.js          # Main daemon — trade-up contract finder
├── env.js              # Environment config loader with hot-reload
├── tradeup.config.cjs  # PM2 process config
├── .env                # Local config (not in git)
├── .env.example        # Config template
├── package.json
└── logs/               # PM2 log files
    ├── tradeup.out.log
    └── tradeup.err.log

Telegram Alert Example

📉 TRADE-UP [DMARKET]
📦 The Havoc Collection

🔁 Mil-Spec Grade → Restricted  |  інпут: Field-Tested

📥 10 інпутів  →  4.50 разом:
  1. MAG-7 | Rust Coat  0.42
  2. MAG-7 | Rust Coat  0.43
  ...

📤 Аутпути (1/3 кожен):
  ✅ 6.20  MP7 | Fade [Factory New]  (+1.70)
  ✅ 5.80  Tec-9 | Fuel Injector [Minimal Wear]  (+1.30)
  ✅ 5.10  FAMAS | Afterimage [Field-Tested]  (+0.60)

💰 Worst-case профіт: +0.60