diff --git a/common/constants.go b/common/constants.go
index 89ba5c315f..ef6593cfe4 100644
--- a/common/constants.go
+++ b/common/constants.go
@@ -1,16 +1,18 @@
 package common
 
 const (
-	RewardMasterPercent     = 40
-	RewardVoterPercent      = 50
-	RewardFoundationPercent = 10
-	HexSignMethod           = "e341eaa4"
-	HexSetSecret            = "34d38600"
-	HexSetOpening           = "e11f5ba2"
-	EpocBlockSecret         = 800
-	EpocBlockOpening        = 850
-	EpocBlockRandomize      = 900
-	MaxMasternodes          = 150
-	LimitPenaltyEpoch       = 4
-	BlocksPerYear           = uint64(15768000)
+	RewardMasterPercent        = 40
+	RewardVoterPercent         = 50
+	RewardFoundationPercent    = 10
+	HexSignMethod              = "e341eaa4"
+	HexSetSecret               = "34d38600"
+	HexSetOpening              = "e11f5ba2"
+	EpocBlockSecret            = 800
+	EpocBlockOpening           = 850
+	EpocBlockRandomize         = 900
+	MaxMasternodes             = 150
+	LimitPenaltyEpoch          = 4
+	BlocksPerYear              = uint64(15768000)
+	LimitThresholdNonceInQueue = 10
+	MinGasPrice                = 2500
 )
\ No newline at end of file
diff --git a/eth/gasprice/gasprice.go b/eth/gasprice/gasprice.go
index 54325692c6..972c6ab3f2 100644
--- a/eth/gasprice/gasprice.go
+++ b/eth/gasprice/gasprice.go
@@ -30,6 +30,7 @@ import (
 )
 
 var maxPrice = big.NewInt(500 * params.Shannon)
+var minPrice = big.NewInt(common.MinGasPrice)
 
 type Config struct {
 	Blocks     int
@@ -140,6 +141,11 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 		price = new(big.Int).Set(maxPrice)
 	}
 
+	// Check gas price min.
+	if price.Cmp(minPrice) < 0 {
+		price = new(big.Int).Set(minPrice)
+	}
+
 	gpo.cacheLock.Lock()
 	gpo.lastHead = headHash
 	gpo.lastPrice = price
@@ -186,4 +192,4 @@ type bigIntArray []*big.Int
 
 func (s bigIntArray) Len() int           { return len(s) }
 func (s bigIntArray) Less(i, j int) bool { return s[i].Cmp(s[j]) < 0 }
-func (s bigIntArray) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+func (s bigIntArray) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
\ No newline at end of file