Trading Charts Development (TradingView Integration)

Exchange Fee Structure Development

Fee structure is a key monetization tool. Too high — traders leave, too low — business becomes unprofitable. Proper system gives flexibility: attract large traders with discounts, retain market makers with zero or negative fees (rebate).

Fee Models

Maker-Taker Model

Standard for most modern CEX. Maker adds liquidity (limit order not immediately executed), taker removes liquidity (market order or limit immediately executed).

• Maker fee: usually 0.01–0.1% (lower, sometimes negative — rebate)
• Taker fee: usually 0.05–0.2%

Negative maker fee (rebate) — exchange pays trader for providing liquidity. Done by Kraken, Binance for high-tier MM.

Volume-Based Tiers

type FeeTier struct {
    MinVolume30d Decimal  // USD volume for 30 days
    MakerFee     Decimal  // % (can be negative for rebate)
    TakerFee     Decimal  // %
    Label        string
}

var DefaultTiers = []FeeTier{
    {MinVolume30d: Decimal("0"),         MakerFee: Decimal("0.10"), TakerFee: Decimal("0.20"), Label: "Regular"},
    {MinVolume30d: Decimal("100000"),    MakerFee: Decimal("0.08"), TakerFee: Decimal("0.16"), Label: "VIP 1"},
    {MinVolume30d: Decimal("500000"),    MakerFee: Decimal("0.05"), TakerFee: Decimal("0.12"), Label: "VIP 2"},
    {MinVolume30d: Decimal("2000000"),   MakerFee: Decimal("0.02"), TakerFee: Decimal("0.08"), Label: "VIP 3"},
    {MinVolume30d: Decimal("10000000"),  MakerFee: Decimal("0.00"), TakerFee: Decimal("0.05"), Label: "VIP 4"},
    {MinVolume30d: Decimal("50000000"),  MakerFee: Decimal("-0.01"), TakerFee: Decimal("0.03"), Label: "VIP 5"},
}

func (fs *FeeSystem) GetUserTier(userID int64) FeeTier {
    volume30d := fs.db.GetUserVolume30d(userID)
    
    var currentTier FeeTier = DefaultTiers[0]
    for _, tier := range DefaultTiers {
        if volume30d.GreaterThanOrEqual(tier.MinVolume30d) {
            currentTier = tier
        }
    }
    return currentTier
}

Platform Token Discount

Binance set standard: paying commission with platform token gives 25% discount.

Per-Pair Fee Overrides

Different pairs can have different fees:

• Stablecoin pairs (USDT/USDC): 0.01% — minimal, highly competitive
• Meme coins: 0.3–0.5% — less competition
• Insider pairs (own token): 0% for market makers

Fee Calculation and Application on Trade

On each fill matching engine must:

1. Determine tier of each participant
2. Calculate fee
3. Apply discounts
4. Debit fee from balance

func (fe *FeeEngine) ProcessTrade(trade Trade) (FeeDeductions, error) {
    takerFee := fe.Calculate(trade.TakerUserID, trade.Value, Taker)
    makerFee := fe.Calculate(trade.MakerUserID, trade.Value, Maker)
    
    // Taker receives base currency minus taker fee
    takerReceives := trade.Quantity.Sub(takerFee.FinalFee.Div(trade.Price))
    
    // Maker receives quote currency minus maker fee
    makerReceives := trade.Value.Sub(makerFee.FinalFee)
    
    // If maker rebate (negative fee) — add bonus
    if makerFee.FinalFee.IsNegative() {
        makerReceives = trade.Value.Add(makerFee.FinalFee.Abs())
    }
    
    return FeeDeductions{
        TakerDeduction: takerFee.FinalFee,
        MakerDeduction: makerFee.FinalFee,
        TakerReceives:  takerReceives,
        MakerReceives:  makerReceives,
        PlatformEarned: takerFee.FinalFee.Add(makerFee.FinalFee),
    }, nil
}

Special Fee Structures

Promo Codes and Referral Discounts

type PromoCode struct {
    Code        string
    DiscountPct Decimal
    MaxUses     int
    ExpiresAt   time.Time
    UserID      *int64   // nil = available to all
}

type ReferralProgram struct {
    ReferrerRebatePct Decimal  // % of referred user's fee
    RefereeDiscountPct Decimal // discount for referred
    MaxDepth          int      // referral network levels
}

Monitoring and Analytics

SELECT
    DATE(t.created_at) AS date,
    t.pair_id,
    SUM(t.taker_fee) AS taker_revenue,
    SUM(CASE WHEN t.maker_fee > 0 THEN t.maker_fee ELSE 0 END) AS maker_revenue,
    SUM(CASE WHEN t.maker_fee < 0 THEN t.maker_fee ELSE 0 END) AS maker_rebates_paid,
    SUM(t.taker_fee) + SUM(t.maker_fee) AS net_revenue,
    COUNT(*) AS trade_count
FROM trades t
WHERE t.created_at >= NOW() - INTERVAL '30 days'
GROUP BY DATE(t.created_at), t.pair_id
ORDER BY date DESC;

Full fee system with maker-taker model, volume tiers, token discounts and referral program: 3–4 weeks.