diff --git a/backend/serve.py b/backend/serve.py
index 566342a..c82409f 100644
--- a/backend/serve.py
+++ b/backend/serve.py
@@ -28,14 +28,14 @@ def root():
 
 
 @app.post("/imageFromPromt")
-def image_from_promt(payload):
+def image_from_promt(payload: PromptPayload):
     consumer = StableDiffusionConsumer()
     image_bytes = consumer.fetch_image(payload.prompt)
 
     return StreamingResponse(consumer.parse_to_bytesio(image_bytes), media_type="image/png")
 
 @app.post("/base64FromPrompt")
-def base64_from_prompt(payload):
+def base64_from_prompt(payload: PromptPayload):
     consumer = StableDiffusionConsumer()
     img_json = {
         "image": consumer.fetch_image(payload.prompt)
@@ -44,7 +44,7 @@ def base64_from_prompt(payload):
     return JSONResponse(content=img_json)
 
 @app.post("/promptsFromText")
-def prompts_from_text(text_payload):
+def prompts_from_text(text_payload: TextPayload):
     prompt_extractor = PromptExtractor()
 
     prompts = prompt_extractor.extract_paragraphs_with_prompts(text_payload.text)