nits

indexer/balance_storage_helper.go

@@ -39,7 +39,7 @@ func (h *BalanceStorageHelper) AccountBalance(
 	block *types.BlockIdentifier,
 ) (*types.Amount, error) {
 	return &types.Amount{
-		Value:    "0",
+		Value:    zeroValue,
 		Currency: currency,
 	}, nil
 }

indexer/indexer.go

@@ -53,6 +53,9 @@ const (
 	// this is the estimated memory overhead for each
 	// block fetched by the indexer.
 	sizeMultiplier = 15
+
+	// zeroValue is 0 as a string
+	zeroValue = "0"
 )
 
 var (
@@ -804,7 +807,7 @@ func (i *Indexer) GetBalance(
 	)
 	if errors.Is(err, storage.ErrAccountMissing) {
 		return &types.Amount{
-			Value:    "0",
+			Value:    zeroValue,
 			Currency: currency,
 		}, blockResponse.Block.BlockIdentifier, nil
 	}