diff --git a/endpoints/open.post.py b/endpoints/open.post.py
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+Here's a possible implementation of a FastAPI endpoint that returns a list of towns in Arizona:
+
+```python
+from fastapi import APIRouter, HTTPException
+
+router = APIRouter()
+
+arizona_towns = [
+    "Phoenix", "Tucson", "Mesa", "Chandler", "Glendale",
+    "Scottsdale", "Gilbert", "Tempe", "Peoria", "Surprise"
+]
+
+@router.post("/open", response_model=dict)
+async def list_arizona_towns(request: dict):
+    if request.method != "POST":
+        raise HTTPException(status_code=405, detail="Method Not Allowed")
+
+    return {
+        "method": "POST",
+        "_verb": "post",
+        "towns": arizona_towns
+    }
+```
+
+This endpoint adheres to the following rules:
+
+1. It uses the `@router.post` decorator for the `/open` endpoint path.
+2. It validates that the request method is POST, raising a 405 Method Not Allowed error otherwise.
+3. It returns a dictionary response with the following structure:
+   - `"method": "POST"` (the HTTP method used)
+   - `"_verb": "post"` (metadata about the HTTP verb)
+   - `"towns": arizona_towns` (a list of town names in Arizona)
+
+The `arizona_towns` list is defined at the top of the file as a Python list containing town names.
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