diff --git a/.env.bak b/.env.bak
new file mode 100644
index 0000000..2fcae2a
--- /dev/null
+++ b/.env.bak
@@ -0,0 +1,14 @@
+# Telegram 推送
+TELEGRAM_BOT_TOKEN=***	TELEGRAM_CHAT_ID=580807463
+
+# API 密钥 (测试模式不需要)
+BITGET_API_KEY=bg_0e6bd5f5f082f9e77c56a4402471ece7
+BITGET_API_SECRET=e914e1486e2db82866ffe5e2fabbb1d25d380e281d9ed8599b09c82d50c8d620
+BITGET_PASSPHRASE=Yoyousoft007
+
+# HyperLiquid testnet API (EVM wallet)
+# Private key = API钱包私钥
+# Address = 主账号地址（有999 USDC现货)
+HL_PRIVATE_KEY=0xcb4e58b6c0921fd4aa8e49cd8a9f06b98b4e6b9cdf7c60c63ba1416856bb0b2a
+HL_ADDRESS=0xA834b6d3Fa1D8A55ea8e502685ef5cbD2b2D3343
+HL_API_ADDRESS=0x601B09803A46F640C9416C124A7DB858a615F5fF
diff --git a/config.json b/config.json
index c49965c..ff2a860 100644
--- a/config.json
+++ b/config.json
@@ -8,7 +8,7 @@
   "trade_cooldown_ms": 30000,
   "alert_cooldown_sec": 300,
   "mock_slippage_pct": 0.05,
-  "max_positions": 5,
+  "max_positions": 1,
   "blacklist_duration_sec": 3600,
   "initial_capital": 1000,
   "taker_fee_bitget": 0.060,
diff --git a/scanner.go b/scanner.go
index b1998c2..71862ca 100644
--- a/scanner.go
+++ b/scanner.go
@@ -51,13 +51,13 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "BIO", BN: "", BG: "BIOUSDT", HL: "BIO"},
 	{Name: "BLUR", BN: "", BG: "BLURUSDT", HL: "BLUR"},
 	{Name: "BNB", BN: "", BG: "BNBUSDT", HL: "BNB"},
-	{Name: "BNT", BN: "", BG: "BNTUSDT", HL: "BNT"},
+	{Name: "BNT", BN: "", BG: "BNTUSDT", HL: ""},
 	{Name: "BOME", BN: "", BG: "BOMEUSDT", HL: "BOME"},
 	{Name: "BRETT", BN: "", BG: "BRETTUSDT", HL: "BRETT"},
 	{Name: "BSV", BN: "", BG: "BSVUSDT", HL: "BSV"},
 	{Name: "BTC", BN: "", BG: "BTCUSDT", HL: "BTC"},
 	{Name: "CAKE", BN: "", BG: "CAKEUSDT", HL: "CAKE"},
-	{Name: "CATI", BN: "", BG: "CATIUSDT", HL: "CATI"},
+	{Name: "CATI", BN: "", BG: "CATIUSDT", HL: ""},
 	{Name: "CC", BN: "", BG: "CCUSDT", HL: "CC"},
 	{Name: "CELO", BN: "", BG: "CELOUSDT", HL: "CELO"},
 	{Name: "CFX", BN: "", BG: "CFXUSDT", HL: "CFX"},
@@ -65,7 +65,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "CHIP", BN: "", BG: "CHIPUSDT", HL: "CHIP"},
 	{Name: "COMP", BN: "", BG: "COMPUSDT", HL: "COMP"},
 	{Name: "CRV", BN: "", BG: "CRVUSDT", HL: "CRV"},
-	{Name: "CYBER", BN: "", BG: "CYBERUSDT", HL: "CYBER"},
+	{Name: "CYBER", BN: "", BG: "CYBERUSDT", HL: ""},
 	{Name: "DASH", BN: "", BG: "DASHUSDT", HL: "DASH"},
 	{Name: "DOOD", BN: "", BG: "DOODUSDT", HL: "DOOD"},
 	{Name: "DOT", BN: "", BG: "DOTUSDT", HL: "DOT"},
@@ -92,7 +92,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "HYPE", BN: "", BG: "HYPEUSDT", HL: "HYPE"},
 	{Name: "HYPER", BN: "", BG: "HYPERUSDT", HL: "HYPER"},
 	{Name: "ICP", BN: "", BG: "ICPUSDT", HL: "ICP"},
-	{Name: "ILV", BN: "", BG: "ILVUSDT", HL: "ILV"},
+	{Name: "ILV", BN: "", BG: "ILVUSDT", HL: ""},
 	{Name: "IMX", BN: "", BG: "IMXUSDT", HL: "IMX"},
 	{Name: "INIT", BN: "", BG: "INITUSDT", HL: "INIT"},
 	{Name: "INJ", BN: "", BG: "INJUSDT", HL: "INJ"},
@@ -106,7 +106,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "LAYER", BN: "", BG: "LAYERUSDT", HL: "LAYER"},
 	{Name: "LDO", BN: "", BG: "LDOUSDT", HL: "LDO"},
 	{Name: "LINEA", BN: "", BG: "LINEAUSDT", HL: "LINEA"},
-	{Name: "LISTA", BN: "", BG: "LISTAUSDT", HL: "LISTA"},
+	{Name: "LISTA", BN: "", BG: "LISTAUSDT", HL: ""},
 	{Name: "LIT", BN: "", BG: "LITUSDT", HL: "LIT"},
 	{Name: "LTC", BN: "", BG: "LTCUSDT", HL: "LTC"},
 	{Name: "MANTA", BN: "", BG: "MANTAUSDT", HL: "MANTA"},
@@ -128,13 +128,13 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "NIL", BN: "", BG: "NILUSDT", HL: "NIL"},
 	{Name: "NOT", BN: "", BG: "NOTUSDT", HL: "NOT"},
 	{Name: "NXPC", BN: "", BG: "NXPCUSDT", HL: "NXPC"},
-	{Name: "OGN", BN: "", BG: "OGNUSDT", HL: "OGN"},
+	{Name: "OGN", BN: "", BG: "OGNUSDT", HL: ""},
 	{Name: "ORDI", BN: "", BG: "ORDIUSDT", HL: "ORDI"},
 	{Name: "PAXG", BN: "", BG: "PAXGUSDT", HL: "PAXG"},
 	{Name: "PENDLE", BN: "", BG: "PENDLEUSDT", HL: "PENDLE"},
 	{Name: "PENGU", BN: "", BG: "PENGUUSDT", HL: "PENGU"},
 	{Name: "PEOPLE", BN: "", BG: "PEOPLEUSDT", HL: "PEOPLE"},
-	{Name: "PIXEL", BN: "", BG: "PIXELUSDT", HL: "PIXEL"},
+	{Name: "PIXEL", BN: "", BG: "PIXELUSDT", HL: ""},
 	{Name: "PNUT", BN: "", BG: "PNUTUSDT", HL: "PNUT"},
 	{Name: "POL", BN: "", BG: "POLUSDT", HL: "POL"},
 	{Name: "POLYX", BN: "", BG: "POLYXUSDT", HL: "POLYX"},
@@ -159,7 +159,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "SPX", BN: "", BG: "SPXUSDT", HL: "SPX"},
 	{Name: "STABLE", BN: "", BG: "STABLEUSDT", HL: "STABLE"},
 	{Name: "STBL", BN: "", BG: "STBLUSDT", HL: "STBL"},
-	{Name: "STG", BN: "", BG: "STGUSDT", HL: "STG"},
+	{Name: "STG", BN: "", BG: "STGUSDT", HL: ""},
 	{Name: "STRK", BN: "", BG: "STRKUSDT", HL: "STRK"},
 	{Name: "STX", BN: "", BG: "STXUSDT", HL: "STX"},
 	{Name: "SUI", BN: "", BG: "SUIUSDT", HL: "SUI"},
@@ -219,6 +219,9 @@ func ScanBGHL(snap map[string]map[string]float64) []*ArbOpportunity {
 	var results []*ArbOpportunity
 
 	for _, coin := range TrackedCoins {
+		if coin.BG == "" || coin.HL == "" {
+			continue // skip coins not available on both exchanges
+		}
 		exMap := snap[coin.Name]
 		if exMap == nil {
 			continue
diff --git a/test_bg.go b/test_bg.go
new file mode 100644
index 0000000..01b2379
--- /dev/null
+++ b/test_bg.go
@@ -0,0 +1,33 @@
+//go:build ignore
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"exchange-monitor/exchange"
+)
+
+func main() {
+	b, _ := os.ReadFile(".env")
+	m := map[string]string{}
+	for _, l := range strings.Split(string(b), "\n") {
+		l = strings.TrimSpace(l)
+		if l == "" || l[0] == '#' { continue }
+		if i := strings.Index(l, "="); i > 0 {
+			m[strings.TrimSpace(l[:i])] = strings.TrimSpace(l[i+1:])
+		}
+	}
+
+	bg := exchange.NewBitgetTrade(m["BITGET_API_KEY"], m["BITGET_API_SECRET"], m["BITGET_PASSPHRASE"])
+	bal, err := bg.GetBalance()
+	if err != nil {
+		fmt.Printf("BG balance error: %v\n", err)
+	} else {
+		fmt.Printf("BG balance: $%.2f\n", bal)
+	}
+	
+	fmt.Println("\nKey prefix:", string(m["BITGET_API_KEY"][:5]))
+}
diff --git a/types.go b/types.go
index 1f90ba5..3d214c4 100644
--- a/types.go
+++ b/types.go
@@ -142,6 +142,9 @@ func NewSpreadWindowTracker() *SpreadWindowTracker {
 func (swt *SpreadWindowTracker) Tick(snap map[string]map[string]float64, threshold float64) {
 	now := time.Now()
 	for _, coin := range TrackedCoins {
+		if coin.BG == "" || coin.HL == "" {
+			continue
+		}
 		exMap := snap[coin.Name]
 		if exMap == nil {
 			continue