diff --git a/api/swagger.yml b/api/swagger.yml
index fd1815d..58b5911 100644
--- a/api/swagger.yml
+++ b/api/swagger.yml
@@ -1329,13 +1329,6 @@ components:
           type: string
           description: Moment in which the transaction was added to the pool.
           format: date-time
-        batchNum:
-          type: integer
-          description: Identifier of a batch. Every new forged batch increases by one the batchNum, starting at 0.
-          minimum: 0
-          maximum: 4294967295
-          nullable: true
-          example: null
         requestFromAccountIndex:
           type: string
           description: >-
@@ -1390,7 +1383,6 @@ components:
           $ref: '#/components/schemas/Token'
       example:
         amount: '100000000000000'
-        batchNum: 
         fee: 0
         fromAccountIndex: hez:SCC:256
         fromBJJ: hez:r_trOasVEk0zNaalOoS9aLedu6mO7jI5XTIPu_zGXoyn
@@ -1438,7 +1430,6 @@ components:
         - info
         - signature
         - timestamp
-        - batchNum
         - requestFromAccountIndex
         - requestToAccountIndex
         - requestToHezEthereumAddress
@@ -2812,6 +2803,10 @@ components:
           type: number
           description: Average fee percentage paid for L2 transactions in the last 24 hours.
           example: 1.54
+        estimatedTimeToForgeL1:
+          type: number
+          description: Estimated time needed to forge a L1 transaction, from the time it's added on the smart contract, until it's actualy forged. In seconds.
+          example: 193.4
       additionalProperties: false
       required:
         - transactionsPerBatch
@@ -2820,6 +2815,7 @@ components:
         - totalAccounts
         - totalBJJs
         - avgTransactionFee
+        - estimatedTimeToForgeL1
     PendingItems:
       type: integer
       description: Amount of items that will be returned in subsequent calls to the endpoint, as long as they are done with same filters. When the value is 0 it means that all items have been sent.
diff --git a/common/pooll2tx.go b/common/pooll2tx.go
index c5f324a..c0eb818 100644
--- a/common/pooll2tx.go
+++ b/common/pooll2tx.go
@@ -73,7 +73,7 @@ func NewPoolL2Tx(tx *PoolL2Tx) (*PoolL2Tx, error) {
 	// If original Type doesn't match the correct one, return error
 	if txTypeOld != "" && txTypeOld != tx.Type {
 		return nil, tracerr.Wrap(fmt.Errorf("L2Tx.Type: %s, should be: %s",
-			tx.Type, txTypeOld))
+			txTypeOld, tx.Type))
 	}
 
 	txIDOld := tx.TxID
@@ -83,7 +83,7 @@ func NewPoolL2Tx(tx *PoolL2Tx) (*PoolL2Tx, error) {
 	// If original TxID doesn't match the correct one, return error
 	if txIDOld != (TxID{}) && txIDOld != tx.TxID {
 		return tx, tracerr.Wrap(fmt.Errorf("PoolL2Tx.TxID: %s, should be: %s",
-			tx.TxID.String(), txIDOld.String()))
+			txIDOld.String(), tx.TxID.String()))
 	}
 
 	return tx, nil
diff --git a/db/historydb/apiqueries.go b/db/historydb/apiqueries.go
index 188b8b7..073608c 100644
--- a/db/historydb/apiqueries.go
+++ b/db/historydb/apiqueries.go
@@ -1008,6 +1008,18 @@ func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, err
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
+	err = meddler.QueryRow(
+		hdb.dbRead, metrics,
+		`SELECT COALESCE (AVG(EXTRACT(EPOCH FROM (forged.timestamp - added.timestamp))), 0) AS estimatedTimeToForgeL1 FROM tx
+		INNER JOIN block AS added ON tx.eth_block_num = added.eth_block_num
+		INNER JOIN batch AS forged_batch ON tx.batch_num = forged_batch.batch_num
+		INNER JOIN block AS forged ON forged_batch.eth_block_num = forged.eth_block_num
+		WHERE tx.batch_num between $1 and $2 AND tx.is_l1 AND tx.user_origin;`,
+		metricsTotals.FirstBatchNum, lastBatchNum,
+	)
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
 
 	return metrics, nil
 }
diff --git a/db/historydb/views.go b/db/historydb/views.go
index 1f8e018..fe71733 100644
--- a/db/historydb/views.go
+++ b/db/historydb/views.go
@@ -304,12 +304,13 @@ type BatchAPI struct {
 
 // Metrics define metrics of the network
 type Metrics struct {
-	TransactionsPerBatch  float64 `json:"transactionsPerBatch"`
-	BatchFrequency        float64 `json:"batchFrequency"`
-	TransactionsPerSecond float64 `json:"transactionsPerSecond"`
-	TotalAccounts         int64   `json:"totalAccounts" meddler:"total_accounts"`
-	TotalBJJs             int64   `json:"totalBJJs" meddler:"total_bjjs"`
-	AvgTransactionFee     float64 `json:"avgTransactionFee"`
+	TransactionsPerBatch   float64 `json:"transactionsPerBatch"`
+	BatchFrequency         float64 `json:"batchFrequency"`
+	TransactionsPerSecond  float64 `json:"transactionsPerSecond"`
+	TotalAccounts          int64   `json:"totalAccounts" meddler:"total_accounts"`
+	TotalBJJs              int64   `json:"totalBJJs" meddler:"total_bjjs"`
+	AvgTransactionFee      float64 `json:"avgTransactionFee"`
+	EstimatedTimeToForgeL1 float64 `json:"estimatedTimeToForgeL1" meddler:"estimatedTimeToForgeL1"`
 }
 
 // MetricsTotals is used to get temporal information from HistoryDB
diff --git a/db/l2db/views.go b/db/l2db/views.go
index 5ea1fff..5ae47a4 100644
--- a/db/l2db/views.go
+++ b/db/l2db/views.go
@@ -95,7 +95,6 @@ func (tx PoolTxAPI) MarshalJSON() ([]byte, error) {
 		"info":                        tx.Info,
 		"signature":                   tx.Signature,
 		"timestamp":                   tx.Timestamp,
-		"batchNum":                    tx.BatchNum,
 		"requestFromAccountIndex":     tx.RqFromIdx,
 		"requestToAccountIndex":       tx.RqToIdx,
 		"requestToHezEthereumAddress": tx.RqToEthAddr,