diff --git a/.prettierrc b/.prettierrc
index f0eb61e..0a72520 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -2,5 +2,5 @@
   "trailingComma": "es5",
   "tabWidth": 2,
   "semi": true,
-  "singleQuote": false
+  "singleQuote": true
 }
diff --git a/specification/chats/GetChatRooms/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml b/specification/chats/GetChatRooms/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml
index dff18b3..5f6938e 100644
--- a/specification/chats/GetChatRooms/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml
+++ b/specification/chats/GetChatRooms/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml
@@ -1,7 +1,8 @@
 name: withoutDirectTransfers
 in: query
-description: When set to `true`, excludes type `0` transactions (direct token transfers) from results. Default is `false`.
+description: When set to `1`, excludes type `0` transactions (direct token transfers) from results. Default is `0`.
 schema:
-  type: boolean
-  default: false
+  type: integer
+  enum: [0, 1]
+  default: 0
 required: false
diff --git a/specification/chats/GetChatTransactions/GetChatTransactionsParams.yaml b/specification/chats/GetChatTransactions/GetChatTransactionsParams.yaml
index b5be07c..fbad6e9 100644
--- a/specification/chats/GetChatTransactions/GetChatTransactionsParams.yaml
+++ b/specification/chats/GetChatTransactions/GetChatTransactionsParams.yaml
@@ -48,3 +48,10 @@
 
 # limit
 - $ref: './params/limit.yaml'
+
+###############################
+## Endpoint specific filters ##
+###############################
+
+# withoutDirectTransfers
+- $ref: './params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml'
diff --git a/specification/chats/GetChatTransactions/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml b/specification/chats/GetChatTransactions/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml
new file mode 100644
index 0000000..8ac4a4c
--- /dev/null
+++ b/specification/chats/GetChatTransactions/params/filters/withoutDirectTransfers/withoutDirectTransfers.yaml
@@ -0,0 +1,8 @@
+name: withoutDirectTransfers
+in: query
+description: When set to `0` (zero), includes type `0` transactions (direct token transfers) to results. Default is `1`.
+schema:
+  type: integer
+  enum: [0, 1]
+  default: 1
+required: false