diff --git a/pkg/exchange/bitget/bitgetapi/v2/cancel_order_request.go b/pkg/exchange/bitget/bitgetapi/v2/cancel_order_request.go
index 301212cd59..a3d6f2f523 100644
--- a/pkg/exchange/bitget/bitgetapi/v2/cancel_order_request.go
+++ b/pkg/exchange/bitget/bitgetapi/v2/cancel_order_request.go
@@ -6,13 +6,13 @@ package bitgetapi
 import (
 	"github.com/c9s/requestgen"
 
-	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 type CancelOrder struct {
 	// OrderId are always numeric. It's confirmed with official customer service. https://t.me/bitgetOpenapi/24172
-	OrderId       types.StrInt64 `json:"orderId"`
-	ClientOrderId string         `json:"clientOid"`
+	OrderId       strint.Int64 `json:"orderId"`
+	ClientOrderId string       `json:"clientOid"`
 }
 
 //go:generate PostRequest -url "/api/v2/spot/trade/cancel-order" -type CancelOrderRequest -responseDataType .CancelOrder
diff --git a/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request.go b/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request.go
index 478d802e88..146f154383 100644
--- a/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request.go
+++ b/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request.go
@@ -10,6 +10,8 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
+
 	"github.com/c9s/requestgen"
 )
 
@@ -22,7 +24,7 @@ type FeeDetail struct {
 		// Amount deducted in BGB (Bitget Coin), unit：BGB
 		DeductedInBGB fixedpoint.Value `json:"d"`
 		// If the BGB balance is insufficient to cover the fees, the remaining amount is deducted from the
-		//currency obtained from the transaction.
+		// currency obtained from the transaction.
 		DeductedFromCurrency fixedpoint.Value `json:"r"`
 		// The total fee amount to be paid, unit ：currency obtained from the transaction.
 		ToBePaid fixedpoint.Value `json:"t"`
@@ -34,10 +36,10 @@ type FeeDetail struct {
 }
 
 type OrderDetail struct {
-	UserId types.StrInt64 `json:"userId"`
-	Symbol string         `json:"symbol"`
+	UserId strint.Int64 `json:"userId"`
+	Symbol string       `json:"symbol"`
 	// OrderId are always numeric. It's confirmed with official customer service. https://t.me/bitgetOpenapi/24172
-	OrderId       types.StrInt64   `json:"orderId"`
+	OrderId       strint.Int64     `json:"orderId"`
 	ClientOrderId string           `json:"clientOid"`
 	Price         fixedpoint.Value `json:"price"`
 	// Size is base coin when orderType=limit; quote coin when orderType=market
diff --git a/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request_test.go b/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request_test.go
index 2e3cf9600a..69c1b18cf6 100644
--- a/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request_test.go
+++ b/pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request_test.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 func TestOrderDetail_UnmarshalJSON(t *testing.T) {
@@ -38,9 +39,9 @@ func TestOrderDetail_UnmarshalJSON(t *testing.T) {
 		err := json.Unmarshal([]byte(input), &od)
 		assert.NoError(err)
 		assert.Equal(OrderDetail{
-			UserId:           types.StrInt64(8672173294),
+			UserId:           strint.Int64(8672173294),
 			Symbol:           "APEUSDT",
-			OrderId:          types.StrInt64(1104342023170068480),
+			OrderId:          strint.Int64(1104342023170068480),
 			ClientOrderId:    "f3d6a1ee-4e94-48b5-a6e0-25f3e93d92e1",
 			Price:            fixedpoint.NewFromFloat(1.2),
 			Size:             fixedpoint.NewFromFloat(5),
@@ -83,9 +84,9 @@ func TestOrderDetail_UnmarshalJSON(t *testing.T) {
 		err := json.Unmarshal([]byte(input), &od)
 		assert.NoError(err)
 		assert.Equal(OrderDetail{
-			UserId:           types.StrInt64(8672173294),
+			UserId:           strint.Int64(8672173294),
 			Symbol:           "APEUSDT",
-			OrderId:          types.StrInt64(1104337778433757184),
+			OrderId:          strint.Int64(1104337778433757184),
 			ClientOrderId:    "8afea7bd-d873-44fe-aff8-6a1fae3cc765",
 			Price:            fixedpoint.NewFromFloat(1.4),
 			Size:             fixedpoint.NewFromFloat(5),
diff --git a/pkg/exchange/bitget/bitgetapi/v2/get_trade_fills.go b/pkg/exchange/bitget/bitgetapi/v2/get_trade_fills.go
index fb91bbfc1a..3e89d9fa28 100644
--- a/pkg/exchange/bitget/bitgetapi/v2/get_trade_fills.go
+++ b/pkg/exchange/bitget/bitgetapi/v2/get_trade_fills.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
@@ -38,10 +39,10 @@ type TradeFee struct {
 }
 
 type Trade struct {
-	UserId      types.StrInt64             `json:"userId"`
+	UserId      strint.Int64               `json:"userId"`
 	Symbol      string                     `json:"symbol"`
-	OrderId     types.StrInt64             `json:"orderId"`
-	TradeId     types.StrInt64             `json:"tradeId"`
+	OrderId     strint.Int64               `json:"orderId"`
+	TradeId     strint.Int64               `json:"tradeId"`
 	OrderType   OrderType                  `json:"orderType"`
 	Side        SideType                   `json:"side"`
 	PriceAvg    fixedpoint.Value           `json:"priceAvg"`
diff --git a/pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request.go b/pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request.go
index 3bf57ddc62..afe490f265 100644
--- a/pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request.go
+++ b/pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request.go
@@ -10,13 +10,14 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 type UnfilledOrder struct {
-	UserId types.StrInt64 `json:"userId"`
-	Symbol string         `json:"symbol"`
+	UserId strint.Int64 `json:"userId"`
+	Symbol string       `json:"symbol"`
 	// OrderId are always numeric. It's confirmed with official customer service. https://t.me/bitgetOpenapi/24172
-	OrderId       types.StrInt64   `json:"orderId"`
+	OrderId       strint.Int64     `json:"orderId"`
 	ClientOrderId string           `json:"clientOid"`
 	PriceAvg      fixedpoint.Value `json:"priceAvg"`
 	// Size is base coin when orderType=limit; quote coin when orderType=market
diff --git a/pkg/exchange/bitget/convert_test.go b/pkg/exchange/bitget/convert_test.go
index 5aac971df0..75618d2853 100644
--- a/pkg/exchange/bitget/convert_test.go
+++ b/pkg/exchange/bitget/convert_test.go
@@ -10,6 +10,7 @@ import (
 	v2 "github.com/c9s/bbgo/pkg/exchange/bitget/bitgetapi/v2"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 func Test_toGlobalBalance(t *testing.T) {
@@ -210,7 +211,7 @@ func Test_unfilledOrderToGlobalOrder(t *testing.T) {
 		orderId       = 1105087175647989764
 		unfilledOrder = v2.UnfilledOrder{
 			Symbol:           "BTCUSDT",
-			OrderId:          types.StrInt64(orderId),
+			OrderId:          strint.Int64(orderId),
 			ClientOrderId:    "74b86af3-6098-479c-acac-bfb074c067f3",
 			PriceAvg:         fixedpoint.NewFromFloat(1.2),
 			Size:             fixedpoint.NewFromFloat(5),
@@ -344,7 +345,7 @@ func Test_toGlobalOrder(t *testing.T) {
 		unfilledOrder = v2.OrderDetail{
 			UserId:           123456,
 			Symbol:           "BTCUSDT",
-			OrderId:          types.StrInt64(orderId),
+			OrderId:          strint.Int64(orderId),
 			ClientOrderId:    "74b86af3-6098-479c-acac-bfb074c067f3",
 			Price:            fixedpoint.NewFromFloat(1.2),
 			Size:             fixedpoint.NewFromFloat(5),
@@ -604,10 +605,10 @@ func Test_toGlobalTrade(t *testing.T) {
 	//   "uTime":"1699020564687"
 	// }
 	trade := v2.Trade{
-		UserId:    types.StrInt64(8672173294),
+		UserId:    strint.Int64(8672173294),
 		Symbol:    "APEUSDT",
-		OrderId:   types.StrInt64(1104337778433757184),
-		TradeId:   types.StrInt64(1104337778504044545),
+		OrderId:   strint.Int64(1104337778433757184),
+		TradeId:   strint.Int64(1104337778504044545),
 		OrderType: v2.OrderTypeLimit,
 		Side:      v2.SideTypeSell,
 		PriceAvg:  fixedpoint.NewFromFloat(1.4001),
@@ -816,7 +817,7 @@ func TestOrder_toGlobalOrder(t *testing.T) {
 	o := Order{
 		Trade: Trade{
 			FillPrice:   fixedpoint.NewFromFloat(0.49016),
-			TradeId:     types.StrInt64(1107950490073112582),
+			TradeId:     strint.Int64(1107950490073112582),
 			BaseVolume:  fixedpoint.NewFromFloat(33.6558),
 			FillTime:    types.NewMillisecondTimestampFromInt(1699881902235),
 			FillFee:     fixedpoint.NewFromFloat(-0.0336558),
@@ -824,7 +825,7 @@ func TestOrder_toGlobalOrder(t *testing.T) {
 			TradeScope:  "T",
 		},
 		InstId:           "BGBUSDT",
-		OrderId:          types.StrInt64(1107950489998626816),
+		OrderId:          strint.Int64(1107950489998626816),
 		ClientOrderId:    "cc73aab9-1e44-4022-8458-60d8c6a08753",
 		NewSize:          fixedpoint.NewFromFloat(39.0),
 		Notional:         fixedpoint.NewFromFloat(39.0),
@@ -1133,7 +1134,7 @@ func TestOrder_toGlobalTrade(t *testing.T) {
 	o := Order{
 		Trade: Trade{
 			FillPrice:   fixedpoint.NewFromFloat(0.49016),
-			TradeId:     types.StrInt64(1107950490073112582),
+			TradeId:     strint.Int64(1107950490073112582),
 			BaseVolume:  fixedpoint.NewFromFloat(33.6558),
 			FillTime:    types.NewMillisecondTimestampFromInt(1699881902235),
 			FillFee:     fixedpoint.NewFromFloat(-0.0336558),
@@ -1141,7 +1142,7 @@ func TestOrder_toGlobalTrade(t *testing.T) {
 			TradeScope:  "T",
 		},
 		InstId:           "BGBUSDT",
-		OrderId:          types.StrInt64(1107950489998626816),
+		OrderId:          strint.Int64(1107950489998626816),
 		ClientOrderId:    "cc73aab9-1e44-4022-8458-60d8c6a08753",
 		NewSize:          fixedpoint.NewFromFloat(39.0),
 		Notional:         fixedpoint.NewFromFloat(39.0),
diff --git a/pkg/exchange/bitget/exchange.go b/pkg/exchange/bitget/exchange.go
index 094b88f6a6..70e830ccf5 100644
--- a/pkg/exchange/bitget/exchange.go
+++ b/pkg/exchange/bitget/exchange.go
@@ -15,6 +15,7 @@ import (
 	v2 "github.com/c9s/bbgo/pkg/exchange/bitget/bitgetapi/v2"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 const (
@@ -376,7 +377,7 @@ func (e *Exchange) SubmitOrder(ctx context.Context, order types.SubmitOrder) (cr
 }
 
 func (e *Exchange) QueryOpenOrders(ctx context.Context, symbol string) (orders []types.Order, err error) {
-	var nextCursor types.StrInt64
+	var nextCursor strint.Int64
 	for {
 		if err := queryOpenOrdersRateLimiter.Wait(ctx); err != nil {
 			return nil, fmt.Errorf("open order rate limiter wait error: %w", err)
diff --git a/pkg/exchange/bitget/types.go b/pkg/exchange/bitget/types.go
index 3e186e1c8d..94e3ff955d 100644
--- a/pkg/exchange/bitget/types.go
+++ b/pkg/exchange/bitget/types.go
@@ -9,6 +9,7 @@ import (
 	v2 "github.com/c9s/bbgo/pkg/exchange/bitget/bitgetapi/v2"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 type InstType string
@@ -194,7 +195,7 @@ type MarketTrade struct {
 	Price   fixedpoint.Value
 	Size    fixedpoint.Value
 	Side    SideType
-	TradeId types.StrInt64
+	TradeId strint.Int64
 }
 
 type MarketTradeSlice []MarketTrade
@@ -430,7 +431,7 @@ type AccountEvent struct {
 type Trade struct {
 	// Latest filled price
 	FillPrice fixedpoint.Value `json:"fillPrice"`
-	TradeId   types.StrInt64   `json:"tradeId"`
+	TradeId   strint.Int64     `json:"tradeId"`
 	// Number of latest filled orders
 	BaseVolume fixedpoint.Value           `json:"baseVolume"`
 	FillTime   types.MillisecondTimestamp `json:"fillTime"`
@@ -447,8 +448,8 @@ type Order struct {
 
 	InstId string `json:"instId"`
 	// OrderId are always numeric. It's confirmed with official customer service. https://t.me/bitgetOpenapi/24172
-	OrderId       types.StrInt64 `json:"orderId"`
-	ClientOrderId string         `json:"clientOid"`
+	OrderId       strint.Int64 `json:"orderId"`
+	ClientOrderId string       `json:"clientOid"`
 	// NewSize represents the order quantity, following the specified rules:
 	// when orderType=limit, newSize represents the quantity of base coin,
 	// when orderType=marketandside=buy, newSize represents the quantity of quote coin,
diff --git a/pkg/exchange/okex/convert_test.go b/pkg/exchange/okex/convert_test.go
index cf47a1b87d..1e8b727872 100644
--- a/pkg/exchange/okex/convert_test.go
+++ b/pkg/exchange/okex/convert_test.go
@@ -10,6 +10,7 @@ import (
 	"github.com/c9s/bbgo/pkg/exchange/okex/okexapi"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 func Test_orderDetailToGlobal(t *testing.T) {
@@ -30,7 +31,7 @@ func Test_orderDetailToGlobal(t *testing.T) {
 			FillTime:            types.NewMillisecondTimestampFromInt(0),
 			InstrumentID:        "BTC-USDT",
 			InstrumentType:      okexapi.InstrumentTypeSpot,
-			OrderId:             types.StrInt64(orderId),
+			OrderId:             strint.Int64(orderId),
 			OrderType:           okexapi.OrderTypeLimit,
 			Price:               fixedpoint.NewFromFloat(48174.5),
 			Side:                okexapi.SideTypeBuy,
diff --git a/pkg/exchange/okex/okexapi/client.go b/pkg/exchange/okex/okexapi/client.go
index 59fcdbb4dd..edb201323a 100644
--- a/pkg/exchange/okex/okexapi/client.go
+++ b/pkg/exchange/okex/okexapi/client.go
@@ -17,7 +17,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
-	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 const defaultHTTPTimeout = time.Second * 15
@@ -216,10 +216,10 @@ type APIResponse struct {
 	Data    json.RawMessage `json:"data"`
 
 	// InTime is the timestamp at REST gateway when the request is received, Unix timestamp format in microseconds, e.g. 1597026383085123
-	InTime types.StrInt64 `json:"inTime"`
+	InTime strint.Int64 `json:"inTime"`
 
 	// OutTime is the timestamp at REST gateway when the response is sent, Unix timestamp format in microseconds, e.g. 1597026383085123
-	OutTime types.StrInt64 `json:"outTime"`
+	OutTime strint.Int64 `json:"outTime"`
 }
 
 func (a APIResponse) Validate() error {
diff --git a/pkg/exchange/okex/okexapi/get_account_config_request.go b/pkg/exchange/okex/okexapi/get_account_config_request.go
index 71d4b10e3a..27025641c0 100644
--- a/pkg/exchange/okex/okexapi/get_account_config_request.go
+++ b/pkg/exchange/okex/okexapi/get_account_config_request.go
@@ -3,42 +3,42 @@ package okexapi
 import (
 	"github.com/c9s/requestgen"
 
-	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
 //go:generate -command PostRequest requestgen -method POST -responseType .APIResponse -responseDataField Data
 
 type AccountConfig struct {
-	AccountLevel types.StrInt64 `json:"acctLv"`
+	AccountLevel strint.Int64 `json:"acctLv"`
 
 	AccountSelfTradePreventionMode string `json:"acctStpMode"`
 
-	AutoLoan              bool           `json:"autoLoan"`
-	ContractIsolationMode string         `json:"ctIsoMode"`
-	EnableSpotBorrow      bool           `json:"enableSpotBorrow"`
-	GreeksType            string         `json:"greeksType"`
-	Ip                    string         `json:"ip"`
-	Type                  string         `json:"type"`
-	KycLv                 types.StrInt64 `json:"kycLv"`
-	Label                 string         `json:"label"`
-	Level                 string         `json:"level"`
-	LevelTmp              string         `json:"levelTmp"`
-
-	LiquidationGear types.StrInt64 `json:"liquidationGear"`
-
-	MainUid             string         `json:"mainUid"`
-	MarginIsoMode       string         `json:"mgnIsoMode"`
-	OpAuth              string         `json:"opAuth"`
-	Perm                string         `json:"perm"`
-	PosMode             string         `json:"posMode"`
-	RoleType            types.StrInt64 `json:"roleType"`
-	SpotBorrowAutoRepay bool           `json:"spotBorrowAutoRepay"`
-	SpotOffsetType      string         `json:"spotOffsetType"`
-	SpotRoleType        string         `json:"spotRoleType"`
-	SpotTraderInsts     []interface{}  `json:"spotTraderInsts"`
-	TraderInsts         []interface{}  `json:"traderInsts"`
-	Uid                 string         `json:"uid"`
+	AutoLoan              bool         `json:"autoLoan"`
+	ContractIsolationMode string       `json:"ctIsoMode"`
+	EnableSpotBorrow      bool         `json:"enableSpotBorrow"`
+	GreeksType            string       `json:"greeksType"`
+	Ip                    string       `json:"ip"`
+	Type                  string       `json:"type"`
+	KycLv                 strint.Int64 `json:"kycLv"`
+	Label                 string       `json:"label"`
+	Level                 string       `json:"level"`
+	LevelTmp              string       `json:"levelTmp"`
+
+	LiquidationGear strint.Int64 `json:"liquidationGear"`
+
+	MainUid             string        `json:"mainUid"`
+	MarginIsoMode       string        `json:"mgnIsoMode"`
+	OpAuth              string        `json:"opAuth"`
+	Perm                string        `json:"perm"`
+	PosMode             string        `json:"posMode"`
+	RoleType            strint.Int64  `json:"roleType"`
+	SpotBorrowAutoRepay bool          `json:"spotBorrowAutoRepay"`
+	SpotOffsetType      string        `json:"spotOffsetType"`
+	SpotRoleType        string        `json:"spotRoleType"`
+	SpotTraderInsts     []interface{} `json:"spotTraderInsts"`
+	TraderInsts         []interface{} `json:"traderInsts"`
+	Uid                 string        `json:"uid"`
 }
 
 //go:generate GetRequest -url "/api/v5/account/config" -type GetAccountConfigRequest -responseDataType []AccountConfig
diff --git a/pkg/exchange/okex/okexapi/get_asset_deposit_history_request.go b/pkg/exchange/okex/okexapi/get_asset_deposit_history_request.go
index 73a61a970a..611c03e26b 100644
--- a/pkg/exchange/okex/okexapi/get_asset_deposit_history_request.go
+++ b/pkg/exchange/okex/okexapi/get_asset_deposit_history_request.go
@@ -7,13 +7,14 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
 //go:generate -command PostRequest requestgen -method POST -responseType .APIResponse -responseDataField Data
 
 type DepositRecord struct {
-	ActualDepBlkConfirm types.StrInt64   `json:"actualDepBlkConfirm"`
+	ActualDepBlkConfirm strint.Int64     `json:"actualDepBlkConfirm"`
 	Amount              fixedpoint.Value `json:"amt"`
 	AreaCodeFrom        string           `json:"areaCodeFrom"`
 	Currency            string           `json:"ccy"`
@@ -21,7 +22,7 @@ type DepositRecord struct {
 	DepId               string           `json:"depId"`
 	From                string           `json:"from"`
 	FromWdId            string           `json:"fromWdId"`
-	State               types.StrInt64   `json:"state"`
+	State               strint.Int64     `json:"state"`
 	To                  string           `json:"to"`
 
 	Ts types.MillisecondTimestamp `json:"ts"`
diff --git a/pkg/exchange/okex/okexapi/get_order_history_request.go b/pkg/exchange/okex/okexapi/get_order_history_request.go
index f215066322..631047811a 100644
--- a/pkg/exchange/okex/okexapi/get_order_history_request.go
+++ b/pkg/exchange/okex/okexapi/get_order_history_request.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
@@ -24,7 +25,7 @@ type OrderDetail struct {
 	FillTime       types.MillisecondTimestamp `json:"fillTime"`
 	InstrumentID   string                     `json:"instId"`
 	InstrumentType InstrumentType             `json:"instType"`
-	OrderId        types.StrInt64             `json:"ordId"`
+	OrderId        strint.Int64               `json:"ordId"`
 	OrderType      OrderType                  `json:"ordType"`
 	Price          fixedpoint.Value           `json:"px"`
 	Side           SideType                   `json:"side"`
diff --git a/pkg/exchange/okex/okexapi/get_transaction_history_request.go b/pkg/exchange/okex/okexapi/get_transaction_history_request.go
index 71ddfa487d..2a1dd56f40 100644
--- a/pkg/exchange/okex/okexapi/get_transaction_history_request.go
+++ b/pkg/exchange/okex/okexapi/get_transaction_history_request.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
@@ -15,15 +16,15 @@ import (
 type Trade struct {
 	InstrumentType InstrumentType `json:"instType"`
 	InstrumentId   string         `json:"instId"`
-	TradeId        types.StrInt64 `json:"tradeId"`
-	OrderId        types.StrInt64 `json:"ordId"`
+	TradeId        strint.Int64   `json:"tradeId"`
+	OrderId        strint.Int64   `json:"ordId"`
 	ClientOrderId  string         `json:"clOrdId"`
 	// Data generation time, Unix timestamp format in milliseconds, e.g. 1597026383085.
 	Timestamp     types.MillisecondTimestamp `json:"ts"`
 	FillTime      types.MillisecondTimestamp `json:"fillTime"`
 	FeeCurrency   string                     `json:"feeCcy"`
 	Fee           fixedpoint.Value           `json:"fee"`
-	BillId        types.StrInt64             `json:"billId"`
+	BillId        strint.Int64               `json:"billId"`
 	Side          SideType                   `json:"side"`
 	ExecutionType LiquidityType              `json:"execType"`
 
diff --git a/pkg/exchange/okex/okexapi/place_order_request.go b/pkg/exchange/okex/okexapi/place_order_request.go
index ad9318d4de..3c3512fcc1 100644
--- a/pkg/exchange/okex/okexapi/place_order_request.go
+++ b/pkg/exchange/okex/okexapi/place_order_request.go
@@ -3,7 +3,7 @@ package okexapi
 import (
 	"github.com/c9s/requestgen"
 
-	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 //go:generate -command GetRequest requestgen -method GET -responseType .APIResponse -responseDataField Data
@@ -14,9 +14,9 @@ type OrderResponse struct {
 	ClientOrderID string `json:"clOrdId"`
 	Tag           string `json:"tag"`
 
-	Timestamp types.StrInt64 `json:"ts"`
-	Code      string         `json:"sCode"`
-	Message   string         `json:"sMsg"`
+	Timestamp strint.Int64 `json:"ts"`
+	Code      string       `json:"sCode"`
+	Message   string       `json:"sMsg"`
 }
 
 //go:generate PostRequest -url "/api/v5/trade/order" -type PlaceOrderRequest -responseDataType []OrderResponse
diff --git a/pkg/exchange/okex/okexapi/trade.go b/pkg/exchange/okex/okexapi/trade.go
index f9440c80bd..9fb35e9985 100644
--- a/pkg/exchange/okex/okexapi/trade.go
+++ b/pkg/exchange/okex/okexapi/trade.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 func (c *RestClient) NewBatchPlaceOrderRequest() *BatchPlaceOrderRequest {
@@ -151,7 +152,7 @@ type OrderDetails struct {
 	LastFilledFee         fixedpoint.Value           `json:"fillFee"`
 	LastFilledFeeCurrency string                     `json:"fillFeeCcy"`
 	LastFilledPnl         fixedpoint.Value           `json:"fillPnl"`
-	BillID                types.StrInt64             `json:"billId"`
+	BillID                strint.Int64               `json:"billId"`
 
 	// ExecutionType = liquidity (M = maker or T = taker)
 	ExecutionType string `json:"execType"`
diff --git a/pkg/exchange/okex/parse.go b/pkg/exchange/okex/parse.go
index 44700f58a7..79d7299402 100644
--- a/pkg/exchange/okex/parse.go
+++ b/pkg/exchange/okex/parse.go
@@ -10,6 +10,7 @@ import (
 	"github.com/c9s/bbgo/pkg/exchange/okex/okexapi"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 )
 
 type Channel string
@@ -318,7 +319,7 @@ func parseAccount(v []byte) (*okexapi.Account, error) {
 type OrderTradeEvent struct {
 	okexapi.OrderDetail
 
-	Code          types.StrInt64        `json:"code"`
+	Code          strint.Int64          `json:"code"`
 	Msg           string                `json:"msg"`
 	AmendResult   string                `json:"amendResult"`
 	ExecutionType okexapi.LiquidityType `json:"execType"`
@@ -400,12 +401,12 @@ func toGlobalSideType(side okexapi.SideType) (types.SideType, error) {
 
 type MarketTradeEvent struct {
 	InstId    string                     `json:"instId"`
-	TradeId   types.StrInt64             `json:"tradeId"`
+	TradeId   strint.Int64               `json:"tradeId"`
 	Px        fixedpoint.Value           `json:"px"`
 	Sz        fixedpoint.Value           `json:"sz"`
 	Side      okexapi.SideType           `json:"side"`
 	Timestamp types.MillisecondTimestamp `json:"ts"`
-	Count     types.StrInt64             `json:"count"`
+	Count     strint.Int64               `json:"count"`
 }
 
 func (m *MarketTradeEvent) toGlobalTrade() (types.Trade, error) {
diff --git a/pkg/exchange/okex/parse_test.go b/pkg/exchange/okex/parse_test.go
index aa41338c5f..eaa7f301e1 100644
--- a/pkg/exchange/okex/parse_test.go
+++ b/pkg/exchange/okex/parse_test.go
@@ -9,6 +9,7 @@ import (
 	"github.com/c9s/bbgo/pkg/exchange/okex/okexapi"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/types/strint"
 
 	. "github.com/c9s/bbgo/pkg/testing/testhelper"
 )
@@ -1000,7 +1001,7 @@ func TestOrderTradeEvent(t *testing.T) {
 					FillTime:            types.NewMillisecondTimestampFromInt(1705384184503),
 					InstrumentID:        "OKB-USDT",
 					InstrumentType:      okexapi.InstrumentTypeSpot,
-					OrderId:             types.StrInt64(667364871905857536),
+					OrderId:             strint.Int64(667364871905857536),
 					OrderType:           okexapi.OrderTypeMarket,
 					Price:               fixedpoint.Zero,
 					Side:                okexapi.SideTypeBuy,
@@ -1037,7 +1038,7 @@ func TestOrderTradeEvent(t *testing.T) {
 					AlgoClOrdId:         "",
 					AlgoId:              "",
 				},
-				Code:            types.StrInt64(0),
+				Code:            strint.Int64(0),
 				Msg:             "",
 				AmendResult:     "",
 				ExecutionType:   okexapi.LiquidityTypeTaker,
diff --git a/pkg/types/strint.go b/pkg/types/strint.go
index 8531dad2ea..ab1254f4c2 100644
--- a/pkg/types/strint.go
+++ b/pkg/types/strint.go
@@ -1,5 +1 @@
 package types
-
-import "github.com/c9s/bbgo/pkg/types/strint"
-
-type StrInt64 = strint.Int64
diff --git a/pkg/types/strint/int64.go b/pkg/types/strint/int64.go
index e59c4c7c9f..ef8cc3da0f 100644
--- a/pkg/types/strint/int64.go
+++ b/pkg/types/strint/int64.go
@@ -9,7 +9,7 @@ import (
 // Int64 is a string type for int64
 type Int64 int64
 
-func NewStrInt64FromString(ss string) (Int64, error) {
+func NewFromString(ss string) (Int64, error) {
 	i, err := strconv.ParseInt(ss, 10, 64)
 	if err != nil {
 		return 0, err
@@ -27,7 +27,7 @@ func (s *Int64) UnmarshalYAML(unmarshal func(a interface{}) error) (err error) {
 
 	var ss string
 	if err = unmarshal(&ss); err == nil {
-		s2, err2 := NewStrInt64FromString(ss)
+		s2, err2 := NewFromString(ss)
 		if err2 != nil {
 			return err2
 		}
@@ -45,43 +45,50 @@ func (s *Int64) MarshalJSON() ([]byte, error) {
 }
 
 func (s *Int64) UnmarshalJSON(body []byte) error {
-	var arg interface{}
+	var arg any
 	if err := json.Unmarshal(body, &arg); err != nil {
 		return err
 	}
 
+	val, err := cast(arg)
+	if err != nil {
+		return err
+	}
+
+	*s = Int64(val)
+	return nil
+}
+
+func (s *Int64) String() string {
+	if s == nil {
+		return ""
+	}
+	return strconv.FormatInt(int64(*s), 10)
+}
+
+func cast(arg any) (int64, error) {
 	switch ta := arg.(type) {
 	case string:
-		s2, err := NewStrInt64FromString(ta)
+		s2, err := strconv.ParseInt(ta, 10, 64)
 		if err != nil {
-			return err
+			return 0, err
 		}
 
-		*s = Int64(s2)
-
+		return s2, nil
 	case int64:
-		*s = Int64(ta)
+		return ta, nil
 	case int32:
-		*s = Int64(ta)
+		return int64(ta), nil
 	case int:
-		*s = Int64(ta)
+		return int64(ta), nil
 
 	case float32:
-		*s = Int64(ta)
+		return int64(ta), nil
 
 	case float64:
-		*s = Int64(ta)
+		return int64(ta), nil
 
 	default:
-		return fmt.Errorf("Int64 error: unsupported value type %T", ta)
-	}
-
-	return nil
-}
-
-func (s *Int64) String() string {
-	if s == nil {
-		return ""
+		return 0, fmt.Errorf("strint error: unsupported value type %T", ta)
 	}
-	return strconv.FormatInt(int64(*s), 10)
 }