diff --git a/README.md b/README.md
index 13ee3ad..9a6d507 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ observation = computer.observe()
 
 for _ in range(25):  # max actions
     action = session.plan(observation)
+    print(f"Executing: {action}")
     if action.kind == "stop":
         break
     observation = computer.execute(action)
diff --git a/src/generalagents/action.py b/src/generalagents/action.py
index 453968d..1c23c0b 100644
--- a/src/generalagents/action.py
+++ b/src/generalagents/action.py
@@ -105,6 +105,7 @@ class ActionDrag:
 class ActionScroll:
     kind: Literal["scroll"]
     scroll_delta: int
+    coordinate: Coordinate
 
 
 @dataclass
diff --git a/src/generalagents/agent.py b/src/generalagents/agent.py
index 20c26fb..ee3a06d 100644
--- a/src/generalagents/agent.py
+++ b/src/generalagents/agent.py
@@ -14,6 +14,7 @@ def __init__(
         self,
         model: str,
         api_key: str,
+        base_url: str,
         instruction: str,
         temperature: float,
         max_previous_actions: int,
@@ -23,7 +24,7 @@ def __init__(
         self.instruction = instruction
         self.max_previous_actions = max_previous_actions
         self.client = httpx.Client(
-            base_url="https://api.generalagents.com",
+            base_url=base_url,
             headers={"Authorization": f"Bearer {api_key}"},
         )
         self.previous_actions = []
@@ -31,8 +32,8 @@ def __init__(
 
     def plan(self, observation: Image.Image) -> Action:
         buffer = BytesIO()
-        observation.save(buffer, format="PNG")
-        image_url = f"data:image/png;base64,{base64.b64encode(buffer.getvalue()).decode('utf8')}"
+        observation.save(buffer, format="WEBP")
+        image_url = f"data:image/webp;base64,{base64.b64encode(buffer.getvalue()).decode('utf8')}"
 
         data = {
             "model": self.model,
@@ -47,7 +48,6 @@ def plan(self, observation: Image.Image) -> Action:
 
         action = res.json()["action"]
         self.previous_actions.append(action)
-        print(f"Received action {action}")
         return cattrs.structure(action, Action)  # pyright: ignore [reportArgumentType] https://peps.python.org/pep-0747
 
 
@@ -56,6 +56,7 @@ def __init__(
         self,
         model: str,
         api_key: str = os.getenv("GENERALAGENTS_API_KEY", ""),
+        base_url: str = "https://api.generalagents.com",
         temperature: float = 0.3,
         max_previous_actions: int = 20,
     ):
@@ -68,6 +69,7 @@ def __init__(
             raise ValueError(msg)
         self.model = model
         self.api_key = api_key
+        self.base_url = base_url.rstrip("/")
         self.temperature = temperature
         self.max_previous_actions = max_previous_actions
 
@@ -75,6 +77,7 @@ def start(self, instruction: str) -> Session:
         return Session(
             self.model,
             api_key=self.api_key,
+            base_url=self.base_url,
             instruction=instruction,
             temperature=self.temperature,
             max_previous_actions=self.max_previous_actions,
diff --git a/src/generalagents/macos/computer.py b/src/generalagents/macos/computer.py
index caa1ad0..cdd6e82 100644
--- a/src/generalagents/macos/computer.py
+++ b/src/generalagents/macos/computer.py
@@ -76,7 +76,8 @@ def _execute_action(self, action: Action) -> None:
                 pyautogui.moveTo(*self._scaled(start))
                 pyautogui.dragTo(*self._scaled(end), duration=0.5)
 
-            case ActionScroll(kind="scroll", scroll_delta=delta):
+            case ActionScroll(kind="scroll", scroll_delta=delta, coordinate=coord):
+                pyautogui.moveTo(*self._scaled(coord))
                 pyautogui.scroll(float(delta * self.scale_factor))
 
             case ActionWait(kind="wait"):
diff --git a/tests/test_structure.py b/tests/test_structure.py
index 7658bed..d9b012e 100644
--- a/tests/test_structure.py
+++ b/tests/test_structure.py
@@ -66,8 +66,8 @@ def test_structure():
     assert action == cattrs.structure(dict_, Action)  # pyright: ignore [reportArgumentType]
 
     # Test ActionScroll
-    dict_ = {"kind": "scroll", "scroll_delta": -100}
-    action = ActionScroll(kind="scroll", scroll_delta=-100)
+    dict_ = {"kind": "scroll", "scroll_delta": -100, "coordinate": {"x": 100, "y": 200}}
+    action = ActionScroll(kind="scroll", scroll_delta=-100, coordinate=Coordinate(x=100, y=200))
     assert action == cattrs.structure(dict_, Action)  # pyright: ignore [reportArgumentType]
 
     # Test ActionWait