diff --git a/api.go b/api.go
index 296e323..9f26b76 100644
--- a/api.go
+++ b/api.go
@@ -734,8 +734,13 @@ func (s *Arseeding) getOrders(c *gin.Context) {
 		errorResponse(c, err.Error())
 		return
 	}
-	num := 200
-	orders, err := s.wdb.GetOrdersBySigner(signerAddr, cursorId, num)
+	num, err := strconv.ParseInt(c.DefaultQuery("num", "20"), 10, 64)
+	if err != nil {
+		errorResponse(c, err.Error())
+		return
+	}
+
+	orders, err := s.wdb.GetOrdersBySigner(signerAddr, cursorId, int(num))
 	if err != nil {
 		internalErrorResponse(c, err.Error())
 		return
diff --git a/schema/db.go b/schema/db.go
index d2fc318..b00f451 100644
--- a/schema/db.go
+++ b/schema/db.go
@@ -46,7 +46,7 @@ type Order struct {
 	PaymentStatus string `gorm:"index:idx0" json:"paymentStatus"` // "unpaid", "paid", "expired"
 	PaymentId     string `json:"paymentId"`                       // everHash
 
-	OnChainStatus string `json:"onChainStatus"` // "waiting","pending","success","failed"
+	OnChainStatus string `gorm:"index:idx5" json:"onChainStatus"` // "waiting","pending","success","failed"
 	ApiKey        string `gorm:"index:idx2" json:"-"`
 	Sort          bool   `json:"sort"` // upload items to arweave by sequence
 }
diff --git a/wdb.go b/wdb.go
index 2bc7e28..1011a43 100644
--- a/wdb.go
+++ b/wdb.go
@@ -146,7 +146,7 @@ func (w *Wdb) GetOrdersBySigner(signer string, cursorId int64, num int) ([]schem
 		cursorId = math.MaxInt64
 	}
 	records := make([]schema.Order, 0, num)
-	err := w.Db.Model(&schema.Order{}).Where("signer = ? and id < ?", signer, cursorId).Order("id DESC").Limit(num).Find(&records).Error
+	err := w.Db.Model(&schema.Order{}).Where("id < ? and signer = ? and on_chain_status != ?", cursorId, signer, schema.FailedOnChain).Order("id DESC").Limit(num).Find(&records).Error
 	return records, err
 }