diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 0653603a7..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
----
-language: go
-go:
-- 1.14
-- 1.15
-
-services:
-- redis-server
-- mysql
-
-before_install:
-- mysql -e 'CREATE DATABASE bbgo;'
-- mysql -e 'CREATE DATABASE bbgo_dev;'
-
-install:
-- go get github.com/c9s/rockhopper/cmd/rockhopper
-
-before_script:
-- go mod download
-- make migrations
-
-script:
-- bash scripts/test-sqlite3-migrations.sh
-- bash scripts/test-mysql-migrations.sh
-- go test -v ./pkg/...
diff --git a/config/xmaker.yaml b/config/xmaker.yaml
index dddf31166..b4682f35e 100644
--- a/config/xmaker.yaml
+++ b/config/xmaker.yaml
@@ -60,6 +60,7 @@ crossExchangeStrategies:
     # 18002.00
     pips: 10
     circuitBreaker:
+      enabled: true
       maximumConsecutiveTotalLoss: 36.0
       maximumConsecutiveLossTimes: 10
       maximumLossPerRound: 15.0
diff --git a/examples/exchange-api/binance-book/main.go b/examples/exchange-api/binance-book/main.go
index 42d669a07..6577dad85 100644
--- a/examples/exchange-api/binance-book/main.go
+++ b/examples/exchange-api/binance-book/main.go
@@ -48,7 +48,7 @@ var rootCmd = &cobra.Command{
 		stream.SetPublicOnly()
 		stream.Subscribe(types.BookChannel, symbol, types.SubscribeOptions{})
 
-		streamBook := types.NewStreamBook(symbol)
+		streamBook := types.NewStreamBook(symbol, exchange.Name())
 		streamBook.BindStream(stream)
 
 		go func() {
diff --git a/pkg/bbgo/session.go b/pkg/bbgo/session.go
index e8902a1d2..5e564de8b 100644
--- a/pkg/bbgo/session.go
+++ b/pkg/bbgo/session.go
@@ -464,7 +464,7 @@ func (session *ExchangeSession) initSymbol(ctx context.Context, environ *Environ
 	for _, sub := range session.Subscriptions {
 		switch sub.Channel {
 		case types.BookChannel:
-			book := types.NewStreamBook(sub.Symbol)
+			book := types.NewStreamBook(sub.Symbol, session.ExchangeName)
 			book.BindStream(session.MarketDataStream)
 			session.orderBooks[sub.Symbol] = book
 
diff --git a/pkg/cmd/orderbook.go b/pkg/cmd/orderbook.go
index 87b8b0087..4d6e80464 100644
--- a/pkg/cmd/orderbook.go
+++ b/pkg/cmd/orderbook.go
@@ -54,7 +54,7 @@ var orderbookCmd = &cobra.Command{
 			return fmt.Errorf("session %s not found", sessionName)
 		}
 
-		orderBook := types.NewMutexOrderBook(symbol)
+		orderBook := types.NewMutexOrderBook(symbol, session.Exchange.Name())
 
 		s := session.Exchange.NewStream()
 		s.SetPublicOnly()
diff --git a/pkg/priceresolver/simple.go b/pkg/pricesolver/simple.go
similarity index 84%
rename from pkg/priceresolver/simple.go
rename to pkg/pricesolver/simple.go
index 65b6ec51f..6e16700d2 100644
--- a/pkg/priceresolver/simple.go
+++ b/pkg/pricesolver/simple.go
@@ -1,4 +1,4 @@
-package priceresolver
+package pricesolver
 
 import (
 	"sync"
@@ -9,8 +9,8 @@ import (
 	"github.com/c9s/bbgo/pkg/types"
 )
 
-// SimplePriceResolver implements a map-structure-based price index
-type SimplePriceResolver struct {
+// SimplePriceSolver implements a map-structure-based price index
+type SimplePriceSolver struct {
 	// symbolPrices stores the latest trade price by mapping symbol to price
 	symbolPrices map[string]fixedpoint.Value
 	markets      types.MarketMap
@@ -28,8 +28,8 @@ type SimplePriceResolver struct {
 	mu sync.Mutex
 }
 
-func NewSimplePriceResolver(markets types.MarketMap) *SimplePriceResolver {
-	return &SimplePriceResolver{
+func NewSimplePriceResolver(markets types.MarketMap) *SimplePriceSolver {
+	return &SimplePriceSolver{
 		markets:       markets,
 		symbolPrices:  make(map[string]fixedpoint.Value),
 		pricesByBase:  make(map[string]map[string]fixedpoint.Value),
@@ -37,7 +37,7 @@ func NewSimplePriceResolver(markets types.MarketMap) *SimplePriceResolver {
 	}
 }
 
-func (m *SimplePriceResolver) Update(symbol string, price fixedpoint.Value) {
+func (m *SimplePriceSolver) Update(symbol string, price fixedpoint.Value) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
@@ -65,11 +65,11 @@ func (m *SimplePriceResolver) Update(symbol string, price fixedpoint.Value) {
 	baseMap[market.BaseCurrency] = price
 }
 
-func (m *SimplePriceResolver) UpdateFromTrade(trade types.Trade) {
+func (m *SimplePriceSolver) UpdateFromTrade(trade types.Trade) {
 	m.Update(trade.Symbol, trade.Price)
 }
 
-func (m *SimplePriceResolver) inferencePrice(asset string, assetPrice fixedpoint.Value, preferredFiats ...string) (fixedpoint.Value, bool) {
+func (m *SimplePriceSolver) inferencePrice(asset string, assetPrice fixedpoint.Value, preferredFiats ...string) (fixedpoint.Value, bool) {
 	// log.Infof("inferencePrice %s = %f", asset, assetPrice.Float64())
 	quotePrices, ok := m.pricesByBase[asset]
 	if ok {
@@ -112,7 +112,7 @@ func (m *SimplePriceResolver) inferencePrice(asset string, assetPrice fixedpoint
 	return fixedpoint.Zero, false
 }
 
-func (m *SimplePriceResolver) ResolvePrice(asset string, preferredFiats ...string) (fixedpoint.Value, bool) {
+func (m *SimplePriceSolver) ResolvePrice(asset string, preferredFiats ...string) (fixedpoint.Value, bool) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 	return m.inferencePrice(asset, fixedpoint.One, preferredFiats...)
diff --git a/pkg/priceresolver/simple_test.go b/pkg/pricesolver/simple_test.go
similarity index 99%
rename from pkg/priceresolver/simple_test.go
rename to pkg/pricesolver/simple_test.go
index a5e9c68f2..1714b73ac 100644
--- a/pkg/priceresolver/simple_test.go
+++ b/pkg/pricesolver/simple_test.go
@@ -1,4 +1,4 @@
-package priceresolver
+package pricesolver
 
 import (
 	"testing"
diff --git a/pkg/strategy/audacitymaker/orderflow.go b/pkg/strategy/audacitymaker/orderflow.go
index 94de68880..6326c8360 100644
--- a/pkg/strategy/audacitymaker/orderflow.go
+++ b/pkg/strategy/audacitymaker/orderflow.go
@@ -2,6 +2,7 @@ package audacitymaker
 
 import (
 	"context"
+
 	"github.com/c9s/bbgo/pkg/bbgo"
 	"github.com/c9s/bbgo/pkg/datatype/floats"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
@@ -38,7 +39,7 @@ func (s *PerTrade) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 	position := orderExecutor.Position()
 	symbol := position.Symbol
 	// ger best bid/ask, not used yet
-	s.StreamBook = types.NewStreamBook(symbol)
+	s.StreamBook = types.NewStreamBook(symbol, session.ExchangeName)
 	s.StreamBook.BindStream(session.MarketDataStream)
 
 	// use queue to do time-series rolling
@@ -59,7 +60,7 @@ func (s *PerTrade) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 
 	session.MarketDataStream.OnMarketTrade(func(trade types.Trade) {
 
-		//log.Infof("%s trade @ %f", trade.Side, trade.Price.Float64())
+		// log.Infof("%s trade @ %f", trade.Side, trade.Price.Float64())
 
 		ctx := context.Background()
 
@@ -80,10 +81,10 @@ func (s *PerTrade) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 			sellTradesNumber.Update(1)
 		}
 
-		//canceled := s.orderExecutor.GracefulCancel(ctx)
-		//if canceled != nil {
+		// canceled := s.orderExecutor.GracefulCancel(ctx)
+		// if canceled != nil {
 		//	_ = s.orderExecutor.GracefulCancel(ctx)
-		//}
+		// }
 
 		sizeFraction := buyTradeSize.Sum() / sellTradeSize.Sum()
 		numberFraction := buyTradesNumber.Sum() / sellTradesNumber.Sum()
@@ -112,15 +113,15 @@ func (s *PerTrade) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 			if outlier(orderFlowSizeMinMax.Tail(100), threshold) > 0 && outlier(orderFlowNumberMinMax.Tail(100), threshold) > 0 {
 				_ = s.orderExecutor.GracefulCancel(ctx)
 				log.Infof("long!!")
-				//_ = s.placeTrade(ctx, types.SideTypeBuy, s.Quantity, symbol)
+				// _ = s.placeTrade(ctx, types.SideTypeBuy, s.Quantity, symbol)
 				_ = s.placeOrder(ctx, types.SideTypeBuy, s.Quantity, bid.Price, symbol)
-				//_ = s.placeOrder(ctx, types.SideTypeSell, s.Quantity, ask.Price.Mul(fixedpoint.NewFromFloat(1.0005)), symbol)
+				// _ = s.placeOrder(ctx, types.SideTypeSell, s.Quantity, ask.Price.Mul(fixedpoint.NewFromFloat(1.0005)), symbol)
 			} else if outlier(orderFlowSizeMinMax.Tail(100), threshold) < 0 && outlier(orderFlowNumberMinMax.Tail(100), threshold) < 0 {
 				_ = s.orderExecutor.GracefulCancel(ctx)
 				log.Infof("short!!")
-				//_ = s.placeTrade(ctx, types.SideTypeSell, s.Quantity, symbol)
+				// _ = s.placeTrade(ctx, types.SideTypeSell, s.Quantity, symbol)
 				_ = s.placeOrder(ctx, types.SideTypeSell, s.Quantity, ask.Price, symbol)
-				//_ = s.placeOrder(ctx, types.SideTypeBuy, s.Quantity, bid.Price.Mul(fixedpoint.NewFromFloat(0.9995)), symbol)
+				// _ = s.placeOrder(ctx, types.SideTypeBuy, s.Quantity, bid.Price.Mul(fixedpoint.NewFromFloat(0.9995)), symbol)
 			}
 		}
 
@@ -138,7 +139,9 @@ func (s *PerTrade) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 	}
 }
 
-func (s *PerTrade) placeOrder(ctx context.Context, side types.SideType, quantity fixedpoint.Value, price fixedpoint.Value, symbol string) error {
+func (s *PerTrade) placeOrder(
+	ctx context.Context, side types.SideType, quantity fixedpoint.Value, price fixedpoint.Value, symbol string,
+) error {
 	market, _ := s.session.Market(symbol)
 	_, err := s.orderExecutor.SubmitOrders(ctx, types.SubmitOrder{
 		Symbol:   symbol,
diff --git a/pkg/strategy/scmaker/strategy.go b/pkg/strategy/scmaker/strategy.go
index 1039c3431..053bf20b1 100644
--- a/pkg/strategy/scmaker/strategy.go
+++ b/pkg/strategy/scmaker/strategy.go
@@ -98,7 +98,7 @@ func (s *Strategy) Subscribe(session *bbgo.ExchangeSession) {
 func (s *Strategy) Run(ctx context.Context, _ bbgo.OrderExecutor, session *bbgo.ExchangeSession) error {
 	s.Strategy.Initialize(ctx, s.Environment, session, s.Market, ID, s.InstanceID())
 
-	s.book = types.NewStreamBook(s.Symbol)
+	s.book = types.NewStreamBook(s.Symbol, session.Exchange.Name())
 	s.book.BindStream(session.MarketDataStream)
 
 	s.liquidityOrderBook = bbgo.NewActiveOrderBook(s.Symbol)
diff --git a/pkg/strategy/tri/strategy.go b/pkg/strategy/tri/strategy.go
index c4d8b39e3..429d9e480 100644
--- a/pkg/strategy/tri/strategy.go
+++ b/pkg/strategy/tri/strategy.go
@@ -513,7 +513,9 @@ func notifyUsdPnL(profit fixedpoint.Value) {
 	bbgo.Notify(title)
 }
 
-func (s *Strategy) iocOrderExecution(ctx context.Context, session *bbgo.ExchangeSession, orders [3]types.SubmitOrder, ratio float64) (types.OrderSlice, error) {
+func (s *Strategy) iocOrderExecution(
+	ctx context.Context, session *bbgo.ExchangeSession, orders [3]types.SubmitOrder, ratio float64,
+) (types.OrderSlice, error) {
 	service, ok := session.Exchange.(types.ExchangeOrderQueryService)
 	if !ok {
 		return nil, errors.New("exchange does not support ExchangeOrderQueryService")
@@ -700,7 +702,9 @@ func (s *Strategy) waitWebSocketOrderDone(ctx context.Context, orderID uint64, t
 	}
 }
 
-func (s *Strategy) waitOrdersAndCollectTrades(ctx context.Context, service types.ExchangeOrderQueryService, createdOrders types.OrderSlice) (map[uint64][]types.Trade, types.OrderSlice, error) {
+func (s *Strategy) waitOrdersAndCollectTrades(
+	ctx context.Context, service types.ExchangeOrderQueryService, createdOrders types.OrderSlice,
+) (map[uint64][]types.Trade, types.OrderSlice, error) {
 	var err error
 	var orderTrades = make(map[uint64][]types.Trade)
 	var updatedOrders types.OrderSlice
@@ -763,7 +767,9 @@ func (s *Strategy) analyzeOrders(orders types.OrderSlice) {
 	}
 }
 
-func (s *Strategy) buildArbMarkets(session *bbgo.ExchangeSession, symbols []string, separateStream bool, sigC sigchan.Chan) (map[string]*ArbMarket, error) {
+func (s *Strategy) buildArbMarkets(
+	session *bbgo.ExchangeSession, symbols []string, separateStream bool, sigC sigchan.Chan,
+) (map[string]*ArbMarket, error) {
 	markets := make(map[string]*ArbMarket)
 	// build market object
 	for _, symbol := range symbols {
@@ -790,7 +796,7 @@ func (s *Strategy) buildArbMarkets(session *bbgo.ExchangeSession, symbols []stri
 				Speed: types.SpeedHigh,
 			})
 
-			book := types.NewStreamBook(symbol)
+			book := types.NewStreamBook(symbol, session.ExchangeName)
 			priceUpdater := func(_ types.SliceOrderBook) {
 				bestBid, bestAsk, _ := book.BestBidAndAsk()
 				if bestAsk.Equals(m.bestAsk) && bestBid.Equals(m.bestBid) {
diff --git a/pkg/strategy/xalign/strategy.go b/pkg/strategy/xalign/strategy.go
index 40b0a6f01..2f5776622 100644
--- a/pkg/strategy/xalign/strategy.go
+++ b/pkg/strategy/xalign/strategy.go
@@ -14,7 +14,7 @@ import (
 	"github.com/c9s/bbgo/pkg/bbgo"
 	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
-	"github.com/c9s/bbgo/pkg/priceresolver"
+	"github.com/c9s/bbgo/pkg/pricesolver"
 	"github.com/c9s/bbgo/pkg/types"
 )
 
@@ -57,7 +57,7 @@ type Strategy struct {
 
 	faultBalanceRecords map[string][]TimeBalance
 
-	priceResolver *priceresolver.SimplePriceResolver
+	priceResolver *pricesolver.SimplePriceSolver
 
 	sessions   map[string]*bbgo.ExchangeSession
 	orderBooks map[string]*bbgo.ActiveOrderBook
@@ -372,7 +372,7 @@ func (s *Strategy) CrossRun(ctx context.Context, _ bbgo.OrderExecutionRouter, se
 		// session.Market(symbol)
 	}
 
-	s.priceResolver = priceresolver.NewSimplePriceResolver(markets)
+	s.priceResolver = pricesolver.NewSimplePriceResolver(markets)
 
 	bbgo.OnShutdown(ctx, func(ctx context.Context, wg *sync.WaitGroup) {
 		defer wg.Done()
diff --git a/pkg/strategy/xdepthmaker/strategy.go b/pkg/strategy/xdepthmaker/strategy.go
index 103c50bf4..8863a98d1 100644
--- a/pkg/strategy/xdepthmaker/strategy.go
+++ b/pkg/strategy/xdepthmaker/strategy.go
@@ -393,7 +393,7 @@ func (s *Strategy) CrossRun(
 		return err
 	}
 
-	s.pricingBook = types.NewStreamBook(s.HedgeSymbol)
+	s.pricingBook = types.NewStreamBook(s.HedgeSymbol, s.hedgeSession.ExchangeName)
 	s.pricingBook.BindStream(s.hedgeSession.MarketDataStream)
 
 	s.stopC = make(chan struct{})
diff --git a/pkg/strategy/xdepthmaker/strategy_test.go b/pkg/strategy/xdepthmaker/strategy_test.go
index 2df6424c0..3ba221425 100644
--- a/pkg/strategy/xdepthmaker/strategy_test.go
+++ b/pkg/strategy/xdepthmaker/strategy_test.go
@@ -44,7 +44,7 @@ func TestStrategy_generateMakerOrders(t *testing.T) {
 		},
 	}
 
-	pricingBook := types.NewStreamBook("BTCUSDT")
+	pricingBook := types.NewStreamBook("BTCUSDT", types.ExchangeBinance)
 	pricingBook.Load(types.SliceOrderBook{
 		Symbol: "BTCUSDT",
 		Bids: types.PriceVolumeSlice{
diff --git a/pkg/strategy/xgap/strategy.go b/pkg/strategy/xgap/strategy.go
index 2470bf71c..ca812551f 100644
--- a/pkg/strategy/xgap/strategy.go
+++ b/pkg/strategy/xgap/strategy.go
@@ -153,11 +153,11 @@ func (s *Strategy) CrossRun(ctx context.Context, _ bbgo.OrderExecutionRouter, se
 	})
 
 	if s.SourceExchange != "" {
-		s.sourceBook = types.NewStreamBook(s.Symbol)
+		s.sourceBook = types.NewStreamBook(s.Symbol, sourceSession.ExchangeName)
 		s.sourceBook.BindStream(s.sourceSession.MarketDataStream)
 	}
 
-	s.tradingBook = types.NewStreamBook(s.Symbol)
+	s.tradingBook = types.NewStreamBook(s.Symbol, tradingSession.ExchangeName)
 	s.tradingBook.BindStream(s.tradingSession.MarketDataStream)
 
 	s.tradingSession.UserDataStream.OnTradeUpdate(func(trade types.Trade) {
diff --git a/pkg/strategy/xmaker/metrics.go b/pkg/strategy/xmaker/metrics.go
new file mode 100644
index 000000000..b61c6fc85
--- /dev/null
+++ b/pkg/strategy/xmaker/metrics.go
@@ -0,0 +1,43 @@
+package xmaker
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var openOrderBidExposureInUsdMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "xmaker_open_order_bid_exposure_in_usd",
+		Help: "",
+	}, []string{"strategy_type", "strategy_id", "exchange", "symbol"})
+
+var openOrderAskExposureInUsdMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "xmaker_open_order_ask_exposure_in_usd",
+		Help: "",
+	}, []string{"strategy_type", "strategy_id", "exchange", "symbol"})
+
+var makerBestBidPriceMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "xmaker_maker_best_bid_price",
+		Help: "",
+	}, []string{"strategy_type", "strategy_id", "exchange", "symbol"})
+
+var makerBestAskPriceMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "xmaker_maker_best_ask_price",
+		Help: "",
+	}, []string{"strategy_type", "strategy_id", "exchange", "symbol"})
+
+var numOfLayersMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "xmaker_num_of_layers",
+		Help: "",
+	}, []string{"strategy_type", "strategy_id", "exchange", "symbol"})
+
+func init() {
+	prometheus.MustRegister(
+		openOrderBidExposureInUsdMetrics,
+		openOrderAskExposureInUsdMetrics,
+		makerBestBidPriceMetrics,
+		makerBestAskPriceMetrics,
+		numOfLayersMetrics,
+	)
+}
diff --git a/pkg/strategy/xmaker/strategy.go b/pkg/strategy/xmaker/strategy.go
index 071d59600..3de63260a 100644
--- a/pkg/strategy/xmaker/strategy.go
+++ b/pkg/strategy/xmaker/strategy.go
@@ -7,13 +7,15 @@ import (
 	"time"
 
 	"github.com/pkg/errors"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/time/rate"
 
 	"github.com/c9s/bbgo/pkg/bbgo"
 	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
-	"github.com/c9s/bbgo/pkg/indicator"
+	indicatorv2 "github.com/c9s/bbgo/pkg/indicator/v2"
+	"github.com/c9s/bbgo/pkg/pricesolver"
 	"github.com/c9s/bbgo/pkg/risk/circuitbreaker"
 	"github.com/c9s/bbgo/pkg/types"
 	"github.com/c9s/bbgo/pkg/util"
@@ -95,10 +97,11 @@ type Strategy struct {
 	makerMarket, sourceMarket types.Market
 
 	// boll is the BOLLINGER indicator we used for predicting the price.
-	boll *indicator.BOLL
+	boll *indicatorv2.BOLLStream
 
 	state *State
 
+	priceSolver    *pricesolver.SimplePriceSolver
 	CircuitBreaker *circuitbreaker.BasicCircuitBreaker `json:"circuitBreaker"`
 
 	// persistence fields
@@ -214,6 +217,8 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 	// use mid-price for the last price
 	s.lastPrice = bestBid.Price.Add(bestAsk.Price).Div(Two)
 
+	s.priceSolver.Update(s.Symbol, s.lastPrice)
+
 	bookLastUpdateTime := s.book.LastUpdateTime()
 
 	if _, err := s.bidPriceHeartBeat.Update(bestBid); err != nil {
@@ -380,6 +385,16 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 		}
 	}
 
+	labels := prometheus.Labels{
+		"strategy_type": ID,
+		"strategy_id":   s.InstanceID(),
+		"exchange":      s.MakerExchange,
+		"symbol":        s.Symbol,
+	}
+
+	bidExposureInUsd := fixedpoint.Zero
+	askExposureInUsd := fixedpoint.Zero
+
 	bidPrice := bestBidPrice
 	askPrice := bestAskPrice
 	for i := 0; i < s.NumLayers; i++ {
@@ -413,6 +428,8 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 					Mul(s.makerMarket.TickSize)))
 			}
 
+			makerBestBidPriceMetrics.With(labels).Set(bidPrice.Float64())
+
 			if makerQuota.QuoteAsset.Lock(bidQuantity.Mul(bidPrice)) && hedgeQuota.BaseAsset.Lock(bidQuantity) {
 				// if we bought, then we need to sell the base from the hedge session
 				submitOrders = append(submitOrders, types.SubmitOrder{
@@ -427,6 +444,7 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 
 				makerQuota.Commit()
 				hedgeQuota.Commit()
+				bidExposureInUsd = bidExposureInUsd.Add(bidQuantity.Mul(bidPrice))
 			} else {
 				makerQuota.Rollback()
 				hedgeQuota.Rollback()
@@ -466,7 +484,10 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 				askPrice = askPrice.Add(pips.Mul(fixedpoint.NewFromInt(int64(i)).Mul(s.makerMarket.TickSize)))
 			}
 
+			makerBestAskPriceMetrics.With(labels).Set(askPrice.Float64())
+
 			if makerQuota.BaseAsset.Lock(askQuantity) && hedgeQuota.QuoteAsset.Lock(askQuantity.Mul(askPrice)) {
+
 				// if we bought, then we need to sell the base from the hedge session
 				submitOrders = append(submitOrders, types.SubmitOrder{
 					Symbol:      s.Symbol,
@@ -480,6 +501,8 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 				})
 				makerQuota.Commit()
 				hedgeQuota.Commit()
+
+				askExposureInUsd = askExposureInUsd.Add(askQuantity.Mul(askPrice))
 			} else {
 				makerQuota.Rollback()
 				hedgeQuota.Rollback()
@@ -496,14 +519,28 @@ func (s *Strategy) updateQuote(ctx context.Context, orderExecutionRouter bbgo.Or
 		return
 	}
 
-	makerOrders, err := orderExecutionRouter.SubmitOrdersTo(ctx, s.MakerExchange, submitOrders...)
+	formattedOrders, err := s.makerSession.FormatOrders(submitOrders)
 	if err != nil {
-		log.WithError(err).Errorf("order error: %s", err.Error())
 		return
 	}
 
-	s.activeMakerOrders.Add(makerOrders...)
-	s.orderStore.Add(makerOrders...)
+	orderCreateCallback := func(createdOrder types.Order) {
+		s.orderStore.Add(createdOrder)
+		s.activeMakerOrders.Add(createdOrder)
+	}
+
+	defer s.tradeCollector.Process()
+
+	createdOrders, errIdx, err := bbgo.BatchPlaceOrder(ctx, s.makerSession.Exchange, orderCreateCallback, formattedOrders...)
+	if err != nil {
+		log.WithError(err).Errorf("unable to place maker orders: %+v", formattedOrders)
+	}
+
+	openOrderBidExposureInUsdMetrics.With(labels).Set(bidExposureInUsd.Float64())
+	openOrderAskExposureInUsdMetrics.With(labels).Set(askExposureInUsd.Float64())
+
+	_ = errIdx
+	_ = createdOrders
 }
 
 var lastPriceModifier = fixedpoint.NewFromFloat(1.001)
@@ -744,6 +781,10 @@ func (s *Strategy) CrossRun(
 
 	s.sourceSession = sourceSession
 
+	// initialize the price resolver
+	sourceMarkets := s.sourceSession.Markets()
+	s.priceSolver = pricesolver.NewSimplePriceResolver(sourceMarkets)
+
 	makerSession, ok := sessions[s.MakerExchange]
 	if !ok {
 		return fmt.Errorf("maker exchange session %s is not defined", s.MakerExchange)
@@ -761,24 +802,16 @@ func (s *Strategy) CrossRun(
 		return fmt.Errorf("maker session market %s is not defined", s.Symbol)
 	}
 
-	standardIndicatorSet := s.sourceSession.StandardIndicatorSet(s.Symbol)
+	indicators := s.sourceSession.Indicators(s.Symbol)
 	if !ok {
 		return fmt.Errorf("%s standard indicator set not found", s.Symbol)
 	}
 
-	s.boll = standardIndicatorSet.BOLL(types.IntervalWindow{
+	s.boll = indicators.BOLL(types.IntervalWindow{
 		Interval: s.BollBandInterval,
 		Window:   21,
 	}, 1.0)
 
-	if store, ok := s.sourceSession.MarketDataStore(s.Symbol); ok {
-		if klines, ok2 := store.KLinesOfInterval(s.BollBandInterval); ok2 {
-			for i := 0; i < len(*klines); i++ {
-				s.boll.CalculateAndUpdate((*klines)[0 : i+1])
-			}
-		}
-	}
-
 	// restore state
 	instanceID := s.InstanceID()
 	s.groupID = util.FNV32(instanceID)
@@ -819,7 +852,7 @@ func (s *Strategy) CrossRun(
 		})
 	}
 
-	s.book = types.NewStreamBook(s.Symbol)
+	s.book = types.NewStreamBook(s.Symbol, s.sourceSession.ExchangeName)
 	s.book.BindStream(s.sourceSession.MarketDataStream)
 
 	s.activeMakerOrders = bbgo.NewActiveOrderBook(s.Symbol)
@@ -948,10 +981,7 @@ func (s *Strategy) CrossRun(
 		// wait for the quoter to stop
 		time.Sleep(s.UpdateInterval.Duration())
 
-		shutdownCtx, cancelShutdown := context.WithTimeout(context.TODO(), time.Minute)
-		defer cancelShutdown()
-
-		if err := s.activeMakerOrders.GracefulCancel(shutdownCtx, s.makerSession.Exchange); err != nil {
+		if err := s.activeMakerOrders.GracefulCancel(ctx, s.makerSession.Exchange); err != nil {
 			log.WithError(err).Errorf("graceful cancel error")
 		}
 
diff --git a/pkg/twap/stream_executor.go b/pkg/twap/stream_executor.go
index 839d42670..ff1fc8af1 100644
--- a/pkg/twap/stream_executor.go
+++ b/pkg/twap/stream_executor.go
@@ -396,7 +396,7 @@ func (e *StreamExecutor) Run(parentCtx context.Context) error {
 	e.marketDataStream.SetPublicOnly()
 	e.marketDataStream.Subscribe(types.BookChannel, e.Symbol, types.SubscribeOptions{})
 
-	e.orderBook = types.NewStreamBook(e.Symbol)
+	e.orderBook = types.NewStreamBook(e.Symbol, e.Session.ExchangeName)
 	e.orderBook.BindStream(e.marketDataStream)
 
 	e.userDataStream = e.Session.Exchange.NewStream()
diff --git a/pkg/twap/v2/stream_executor.go b/pkg/twap/v2/stream_executor.go
index 1cbea8806..e521ad2ad 100644
--- a/pkg/twap/v2/stream_executor.go
+++ b/pkg/twap/v2/stream_executor.go
@@ -88,7 +88,7 @@ func NewFixedQuantityExecutor(
 		Depth: types.DepthLevelMedium,
 	})
 
-	orderBook := types.NewStreamBook(symbol)
+	orderBook := types.NewStreamBook(symbol, exchange.Name())
 	orderBook.BindStream(marketDataStream)
 
 	userDataStream := exchange.NewStream()
diff --git a/pkg/twap/v2/stream_executor_test.go b/pkg/twap/v2/stream_executor_test.go
index f0aa79485..fe3f05cdb 100644
--- a/pkg/twap/v2/stream_executor_test.go
+++ b/pkg/twap/v2/stream_executor_test.go
@@ -143,6 +143,7 @@ func TestNewStreamExecutor(t *testing.T) {
 		},
 	}
 
+	mockEx.EXPECT().Name().Return(exchangeName)
 	mockEx.EXPECT().NewStream().Return(mockMarketDataStream)
 	mockEx.EXPECT().NewStream().Return(mockUserDataStream)
 	mockEx.EXPECT().QueryAccountBalances(gomock.AssignableToTypeOf(ctx)).Return(initialBalances, nil)
diff --git a/pkg/types/orderbook.go b/pkg/types/orderbook.go
index 4e2c8bb29..0653fab68 100644
--- a/pkg/types/orderbook.go
+++ b/pkg/types/orderbook.go
@@ -6,6 +6,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
+
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 )
 
@@ -26,12 +28,13 @@ type OrderBook interface {
 type MutexOrderBook struct {
 	sync.Mutex
 
-	Symbol string
+	Symbol   string
+	Exchange ExchangeName
 
 	orderBook OrderBook
 }
 
-func NewMutexOrderBook(symbol string) *MutexOrderBook {
+func NewMutexOrderBook(symbol string, exchangeName ExchangeName) *MutexOrderBook {
 	var book OrderBook = NewSliceOrderBook(symbol)
 
 	if v, _ := strconv.ParseBool(os.Getenv("ENABLE_RBT_ORDERBOOK")); v {
@@ -40,6 +43,7 @@ func NewMutexOrderBook(symbol string) *MutexOrderBook {
 
 	return &MutexOrderBook{
 		Symbol:    symbol,
+		Exchange:  exchangeName,
 		orderBook: book,
 	}
 }
@@ -134,6 +138,46 @@ type BookSignal struct {
 	Time time.Time
 }
 
+var streamOrderBookBestBidPriceMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "bbgo_stream_order_book_best_bid_price",
+		Help: "",
+	}, []string{"symbol", "exchange"})
+
+var streamOrderBookBestAskPriceMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "bbgo_stream_order_book_best_ask_price",
+		Help: "",
+	}, []string{"symbol", "exchange"})
+
+var streamOrderBookBestBidVolumeMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "bbgo_stream_order_book_best_bid_volume",
+		Help: "",
+	}, []string{"symbol", "exchange"})
+
+var streamOrderBookBestAskVolumeMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "bbgo_stream_order_book_best_ask_volume",
+		Help: "",
+	}, []string{"symbol", "exchange"})
+
+var streamOrderBookUpdateTimeMetrics = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Name: "bbgo_stream_order_book_update_time_milliseconds",
+		Help: "",
+	}, []string{"symbol", "exchange"})
+
+func init() {
+	prometheus.MustRegister(
+		streamOrderBookBestBidPriceMetrics,
+		streamOrderBookBestAskPriceMetrics,
+		streamOrderBookBestBidVolumeMetrics,
+		streamOrderBookBestAskVolumeMetrics,
+		streamOrderBookUpdateTimeMetrics,
+	)
+}
+
 // StreamOrderBook receives streaming data from websocket connection and
 // update the order book with mutex lock, so you can safely access it.
 //
@@ -147,13 +191,25 @@ type StreamOrderBook struct {
 	snapshotCallbacks []func(snapshot SliceOrderBook)
 }
 
-func NewStreamBook(symbol string) *StreamOrderBook {
+func NewStreamBook(symbol string, exchangeName ExchangeName) *StreamOrderBook {
 	return &StreamOrderBook{
-		MutexOrderBook: NewMutexOrderBook(symbol),
+		MutexOrderBook: NewMutexOrderBook(symbol, exchangeName),
 		C:              make(chan *BookSignal, 1),
 	}
 }
 
+func (sb *StreamOrderBook) updateMetrics(t time.Time) {
+	bestBid, bestAsk, ok := sb.BestBidAndAsk()
+	if ok {
+		exchangeName := string(sb.Exchange)
+		streamOrderBookBestAskPriceMetrics.WithLabelValues(sb.Symbol, exchangeName).Set(bestAsk.Price.Float64())
+		streamOrderBookBestBidPriceMetrics.WithLabelValues(sb.Symbol, exchangeName).Set(bestBid.Price.Float64())
+		streamOrderBookBestAskVolumeMetrics.WithLabelValues(sb.Symbol, exchangeName).Set(bestAsk.Volume.Float64())
+		streamOrderBookBestBidVolumeMetrics.WithLabelValues(sb.Symbol, exchangeName).Set(bestBid.Volume.Float64())
+		streamOrderBookUpdateTimeMetrics.WithLabelValues(sb.Symbol, exchangeName).Set(float64(t.UnixMilli()))
+	}
+}
+
 func (sb *StreamOrderBook) BindStream(stream Stream) {
 	stream.OnBookSnapshot(func(book SliceOrderBook) {
 		if sb.MutexOrderBook.Symbol != book.Symbol {
@@ -163,6 +219,7 @@ func (sb *StreamOrderBook) BindStream(stream Stream) {
 		sb.Load(book)
 		sb.EmitSnapshot(book)
 		sb.emitChange(BookSignalSnapshot, book.Time)
+		sb.updateMetrics(book.Time)
 	})
 
 	stream.OnBookUpdate(func(book SliceOrderBook) {
@@ -173,6 +230,7 @@ func (sb *StreamOrderBook) BindStream(stream Stream) {
 		sb.Update(book)
 		sb.EmitUpdate(book)
 		sb.emitChange(BookSignalUpdate, book.Time)
+		sb.updateMetrics(book.Time)
 	})
 }