diff --git a/api/swagger.yml b/api/swagger.yml
index 4592dd0..56878c6 100644
--- a/api/swagger.yml
+++ b/api/swagger.yml
@@ -2346,35 +2346,35 @@ components:
           type: object
           description: Existence proof of a leaf in a given Merkle Root. Encoded as hexadecimal string.
           properties:
-              Root:
+              root:
                 $ref: '#/components/schemas/BigInt'
-              Siblings:
+              siblings:
                 type: array
                 items:
                   $ref: '#/components/schemas/BigInt'
-              OldKey:
+              oldKey:
                 $ref: '#/components/schemas/BigInt'
-              OldValue:
+              oldValue:
                 $ref: '#/components/schemas/BigInt'
-              IsOld0:
+              isOld0:
                 type: boolean
-              Key:
+              key:
                 $ref: '#/components/schemas/BigInt'
-              Value:
+              value:
                 $ref: '#/components/schemas/BigInt'
-              Fnc:
+              fnc:
                 type: integer
                 maximum: 3
                 minimum: 0
           required:
-            - Root
-            - Siblings
-            - OldKey
-            - OldValue
-            - IsOld0
-            - Key
-            - Value
-            - Fnc
+            - root
+            - siblings
+            - oldKey
+            - oldValue
+            - isOld0
+            - key
+            - value
+            - fnc
           additionalProperties: false
         balance:
           $ref: '#/components/schemas/BigInt'
diff --git a/db/historydb/views.go b/db/historydb/views.go
index d1784bd..4cdc4f3 100644
--- a/db/historydb/views.go
+++ b/db/historydb/views.go
@@ -190,24 +190,11 @@ type ExitAPI struct {
 // MarshalJSON is used to neast some of the fields of ExitAPI
 // without the need of auxiliar structs
 func (e ExitAPI) MarshalJSON() ([]byte, error) {
-	siblings := []string{}
-	for i := 0; i < len(e.MerkleProof.Siblings); i++ {
-		siblings = append(siblings, e.MerkleProof.Siblings[i].String())
-	}
 	return json.Marshal(map[string]interface{}{
-		"itemId":       e.ItemID,
-		"batchNum":     e.BatchNum,
-		"accountIndex": e.AccountIdx,
-		"merkleProof": map[string]interface{}{
-			"Root":     e.MerkleProof.Root.String(),
-			"Siblings": siblings,
-			"OldKey":   e.MerkleProof.OldKey.String(),
-			"OldValue": e.MerkleProof.OldValue.String(),
-			"IsOld0":   e.MerkleProof.IsOld0,
-			"Key":      e.MerkleProof.Key.String(),
-			"Value":    e.MerkleProof.Value.String(),
-			"Fnc":      e.MerkleProof.Fnc,
-		},
+		"itemId":                 e.ItemID,
+		"batchNum":               e.BatchNum,
+		"accountIndex":           e.AccountIdx,
+		"merkleProof":            e.MerkleProof,
 		"balance":                e.Balance,
 		"instantWithdrawn":       e.InstantWithdrawn,
 		"delayedWithdrawRequest": e.DelayedWithdrawRequest,