How to Calculate CS2 Skin Fair Value

For commodity skins (no special float/sticker):

fair_listing = median(cash_market_asks)   # trim top/bottom outlier if N≥5
fair_exit    = best_credible_bid_after_fees
fair_conservative = min(fair_listing, fair_exit) adjusted for thin count

Cash markets (withdrawable): YouPin, BUFF, Skinport, SkinBaron, CSFloat, DMarket, Waxpeer, … — see data coverage.

Exclude Steam from cash median unless you explicitly model wallet value separately.

curl -s -X POST "https://api.cspriceapi.com/v1/prices/latest" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "items": ["AK-47 | Redline (Field-Tested)"],
    "markets": ["youpin", "buff163", "skinport", "skinbaron", "csfloat", "dmarket"]
  }'

Buy-order exit (YouPin):

curl -s "https://api.cspriceapi.com/v1/prices/youpin/buyorder" \
  -H "x-api-key: YOUR_API_KEY"

Fair value for ★ Butterfly Knife | Doppler (Factory New) without phase is meaningless.

{"market_hash_name": "★ Butterfly Knife | Doppler (Factory New) (Sapphire)", "phase": "Sapphire", "price": "5668.00"}
{"market_hash_name": "★ Butterfly Knife | Doppler (Factory New) (Phase 3)", "phase": "Phase 3", "price": "1774.00"}

Illustrative rows: prices are the EUR medians from the 26 Sep 2026 snapshot in the Doppler guide. Filter to the exact phase before any median. See Doppler guide.

When float drives price (low FN AK, rank-relevant knives), use the YouPin float buckets:

curl -s "https://api.cspriceapi.com/v2/prices/float-ranged" \
  -H "x-api-key: YOUR_API_KEY"

Match the item's float to the bucket's float_range. Bucket median beats global median for wear-sensitive items.

Example: YouPin ¥1,000 ≈ $139 at 7.2 CNY/USD. A Skinport ask for the same item is in EUR and must be converted with your EUR/USD rate before it enters the same median. For "global fair listing," use median in one currency after conversion, or report regional bands.

Red flags:

• One market 40%+ below all others with count == 1
• No recent sales at any price near the outlier
• Sudden 24h drop on single market only

Mitigation:

• Use median, not minimum
• Require count >= 5 per market used
• Cross-check sales search

Item: M4A1-S | Printstream (Field-Tested)

CN median ≈ ¥977.5 → ~$135 USD at 7.2. Western asks ~$128–130 USD. Fair listing band: $128–135 USD equivalent depending on FX.

YouPin buyorder top bid ¥920 → ~$128 exit. Conservative fair ≈ $128 (bid-limited).

Sticker crafts, Blue Gem seeds (#661), and souvenir combos need individual comps from recent sales with float, pattern and stickers (on every Market Hub item page) — generic API rows describe the base skin, not the craft premium.