diff --git a/domain/miningmanager/mempool/ordered_transactions_by_fee_rate.go b/domain/miningmanager/mempool/ordered_transactions_by_fee_rate.go
new file mode 100644
index 000000000..bfcb46f3f
--- /dev/null
+++ b/domain/miningmanager/mempool/ordered_transactions_by_fee_rate.go
@@ -0,0 +1,65 @@
+package mempool
+
+import (
+	"sort"
+
+	"github.com/pkg/errors"
+)
+
+type transactionsOrderedByFee struct {
+	slice []*mempoolTransaction
+}
+
+func (tobf *transactionsOrderedByFee) findTransactionIndex(transaction *mempoolTransaction) (int, error) {
+	if transaction.transaction.Fee == 0 || transaction.transaction.Mass == 0 {
+		return 0, errors.Errorf("findTxIndexInOrderedTransactionsByFeeRate expects a transaction with " +
+			"populated fee and mass")
+	}
+	txID := transaction.transactionID()
+	txFeeRate := float64(transaction.transaction.Fee) / float64(transaction.transaction.Mass)
+
+	return sort.Search(len(tobf.slice), func(i int) bool {
+		iElement := tobf.slice[i]
+		elementFeeRate := float64(iElement.transaction.Fee) / float64(iElement.transaction.Mass)
+		if elementFeeRate > txFeeRate {
+			return true
+		}
+
+		if elementFeeRate == txFeeRate && txID.LessOrEqual(iElement.transactionID()) {
+			return true
+		}
+
+		return false
+	}), nil
+}
+
+func (tobf *transactionsOrderedByFee) push(transaction *mempoolTransaction) error {
+	index, err := tobf.findTransactionIndex(transaction)
+	if err != nil {
+		return err
+	}
+
+	tobf.slice = append(tobf.slice[:index],
+		append([]*mempoolTransaction{transaction}, tobf.slice[index:]...)...)
+
+	return nil
+}
+
+func (tobf *transactionsOrderedByFee) remove(transaction *mempoolTransaction) error {
+	index, err := tobf.findTransactionIndex(transaction)
+	if err != nil {
+		return err
+	}
+
+	txID := transaction.transactionID()
+	if !tobf.slice[index].transactionID().Equal(txID) {
+		return errors.Errorf("Couldn't find %s in mp.orderedTransactionsByFeeRate", txID)
+	}
+
+	tobf.removeAtIndex(index)
+	return nil
+}
+
+func (tobf *transactionsOrderedByFee) removeAtIndex(index int) {
+	tobf.slice = append(tobf.slice[:index], tobf.slice[index+1:]...)
+}
diff --git a/domain/miningmanager/mempool/transactions_pool.go b/domain/miningmanager/mempool/transactions_pool.go
index 6bca3c671..c67a99946 100644
--- a/domain/miningmanager/mempool/transactions_pool.go
+++ b/domain/miningmanager/mempool/transactions_pool.go
@@ -6,14 +6,12 @@ import (
 
 type outpointToTransaction map[externalapi.DomainOutpoint]*mempoolTransaction
 
-type transactionsByFeeHeap []*mempoolTransaction
-
 type transactionsPool struct {
 	mempool                               *mempool
 	allTransactions                       idToTransaction
 	highPriorityTransactions              idToTransaction
 	chainedTransactionsByPreviousOutpoint outpointToTransaction
-	transactionsByFeeRate                 transactionsByFeeHeap
+	transactionsByFeeRate                 transactionsOrderedByFee
 	lastExpireScan                        uint64
 }
 
@@ -23,7 +21,7 @@ func newTransactionsPool(mp *mempool) *transactionsPool {
 		allTransactions:                       idToTransaction{},
 		highPriorityTransactions:              idToTransaction{},
 		chainedTransactionsByPreviousOutpoint: outpointToTransaction{},
-		transactionsByFeeRate:                 transactionsByFeeHeap{},
+		transactionsByFeeRate:                 transactionsOrderedByFee{},
 		lastExpireScan:                        0,
 	}
 }