fix: correct HL fee parsing (OrderStatus not statuses[]) and add productType to BG fills query

config.json

@@ -3,7 +3,7 @@
   "trade_enabled": true,
   "arb_threshold": 0.02,
   "scan_interval_ms": 200,
-  "trade_threshold": 0.05,
+  "trade_threshold": 0.03,
   "trade_amount_usd": 20,
   "trade_cooldown_ms": 30000,
   "alert_cooldown_sec": 300,

exchange/bitget_trade.go

@@ -91,7 +91,7 @@ func (b *BitgetTrade) PlaceMarketOrder(side, symbol, size, tradeSide string) (st
 func (b *BitgetTrade) GetTradeFee(symbol, orderID string) (feeUSD float64, err error) {
 	ts := fmt.Sprintf("%d", time.Now().UnixMilli())
 	method := "GET"
-	requestPath := "/api/v2/mix/order/fills?symbol=" + symbol + "&orderId=" + orderID
+	requestPath := "/api/v2/mix/order/fills?symbol=" + symbol + "&orderId=" + orderID + "&productType=USDT-FUTURES"
 	host := "https://api.bitget.com"
 
 	sign := b.sign(method, requestPath, ts, "")

exchange/hyperliquid_trade.go

@@ -126,25 +126,24 @@ func (h *HyperLiquidTrade) PlaceMarketOrder(coin, side, sz string) (string, erro
 // fee amounts in the order response. The result is equivalent to estimating from
 // TradeAmountUSD, but more accurate for partial fills since it uses actual filled sz/px.
 func (h *HyperLiquidTrade) EstimateFeeFromResponse(orderResponseJSON string, takerFeePct float64) (feeUSD float64, err error) {
+	// HL MarketOpen returns a single OrderStatus object (NOT wrapped in statuses array):
+	// {"resting":..., "filled":{"totalSz":"82.5","avgPx":"0.12153","oid":52463955193}, "error":...}
 	var resp struct {
-		Statuses []struct {
-			Filled *struct {
-				TotalSz string `json:"totalSz"`
-				AvgPx   string `json:"avgPx"`
-			} `json:"filled,omitempty"`
-			Error *string `json:"error,omitempty"`
-		} `json:"statuses"`
+		Resting *json.RawMessage `json:"resting,omitempty"`
+		Filled  *struct {
+			TotalSz string `json:"totalSz"`
+			AvgPx   string `json:"avgPx"`
+		} `json:"filled,omitempty"`
+		Error *string `json:"error,omitempty"`
 	}
 	if err := json.Unmarshal([]byte(orderResponseJSON), &resp); err != nil {
-		return 0, fmt.Errorf("parse order response: %w", err)
+		return 0, fmt.Errorf("parse: %w", err)
 	}
-	for _, st := range resp.Statuses {
-		if st.Filled != nil {
-			sz, _ := strconv.ParseFloat(st.Filled.TotalSz, 64)
-			px, _ := strconv.ParseFloat(st.Filled.AvgPx, 64)
-			if sz > 0 && px > 0 {
-				return sz * px * takerFeePct / 100, nil
-			}
+	if resp.Filled != nil {
+		sz, _ := strconv.ParseFloat(resp.Filled.TotalSz, 64)
+		px, _ := strconv.ParseFloat(resp.Filled.AvgPx, 64)
+		if sz > 0 && px > 0 {
+			return sz * px * takerFeePct / 100, nil
 		}
 	}
 	return 0, fmt.Errorf("no filled status in response")