diff --git a/api-spec/lightpushapi.yaml b/api-spec/lightpushapi_legacy.yaml
similarity index 77%
rename from api-spec/lightpushapi.yaml
rename to api-spec/lightpushapi_legacy.yaml
index 6fc3524..e36b2c0 100644
--- a/api-spec/lightpushapi.yaml
+++ b/api-spec/lightpushapi_legacy.yaml
@@ -1,6 +1,6 @@
 post:
-  summary: Request a message relay from a LightPush service provider
-  description: Push a message to be relayed on a PubSub topic.
+  summary: Request a message relay from a `Legacy` LightPush service provider
+  description: Push a message to be relayed on a PubSub topic. Notice this version of the /lightpush endpoint will be depricated.
   operationId: postMessagesToPubsubTopic
   tags:
     - lightpush
diff --git a/api-spec/lightpushapi_v3.yaml b/api-spec/lightpushapi_v3.yaml
new file mode 100644
index 0000000..47056cc
--- /dev/null
+++ b/api-spec/lightpushapi_v3.yaml
@@ -0,0 +1,72 @@
+post:
+  summary: Request a message relay from a LightPush service provider
+  description: Push a message to be relayed on a PubSub topic.
+  operationId: postMessagesToPubsubTopic
+  tags:
+    - lightpush
+  requestBody:
+    content:
+      application/json:
+        schema:
+          $ref: './schemas/apitypes.yaml#/PushRequest'
+  responses:
+    '200':
+      description: OK
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '400':
+      description: Bad request.
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '413':
+      description: Payload too large.
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '420':
+      description: Invalid message.
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '421':
+      description: Unsupported pubsub topic.
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '500':
+      description: Internal server error
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '429':
+      description: Too many requests
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '503':
+      description: Service not available
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '504':
+      description: Out of RLN proof
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
+    '505':
+      description: No peers to relay
+      content:
+        application/json:
+          schema:
+            $ref: './schemas/apitypes.yaml#/PushResponse'
diff --git a/api-spec/openapi.yaml b/api-spec/openapi.yaml
index 7649f65..8650344 100644
--- a/api-spec/openapi.yaml
+++ b/api-spec/openapi.yaml
@@ -40,7 +40,9 @@ paths:
   /health:
     $ref: "./healthapi.yaml"
   /lightpush/v1/message:
-    $ref: "./lightpushapi.yaml"
+    $ref: "./lightpushapi_legacy.yaml"
+  /lightpush/v3/message:
+    $ref: "./lightpushapi_v3.yaml"
   /relay/v1/messages/{pubsubTopic}:
     $ref: "./relayapi_messages.yaml"
   /relay/v1/subscriptions:
diff --git a/api-spec/schemas/apitypes.yaml b/api-spec/schemas/apitypes.yaml
index fe9ba73..78c2854 100644
--- a/api-spec/schemas/apitypes.yaml
+++ b/api-spec/schemas/apitypes.yaml
@@ -145,23 +145,23 @@ WakuMessageKeyValue:
 StoreQueryResponse:
   type: object
   properties:
-    request_id:
+    requestId:
       type: string
-    status_code:
+    statusCode:
       type: integer
       format: uint32
-    status_desc:
+    statusDesc:
       type: string
     messages:
       type: array
       items:
         $ref: '#/components/schemas/WakuMessageKeyValue'
-    pagination_cursor:
+    paginationCursor:
       type: string
   required:
-    - request_id
-    - status_code
-    - status_desc
+    - requestId
+    - statusCode
+    - statusDesc
     - messages
 
 PushRequest:
@@ -174,6 +174,16 @@ PushRequest:
   required:
     - message
 
+PushResponse:
+  type: object
+  properties:
+    statusDesc: 
+      type: string
+    relayPeerCount: 
+      type: integer
+      format: uint32
+
+    
 ## TODO: Check if it can be tunneled into the one WakuMessage structure
 ##       mainly because of Relay post message request can break in client code
 RelayWakuMessage: