diff --git a/src/pipecat/services/heygen/base_api.py b/src/pipecat/services/heygen/base_api.py
new file mode 100644
index 000000000..8b124a472
--- /dev/null
+++ b/src/pipecat/services/heygen/base_api.py
@@ -0,0 +1,67 @@
+#
+# Copyright (c) 2024–2025, Daily
+#
+# SPDX-License-Identifier: BSD 2-Clause License
+#
+
+"""Base API for HeyGen avatar services.
+
+Base class defining the common interface for HeyGen avatar service APIs.
+"""
+
+from abc import ABC, abstractmethod
+from typing import Any
+
+from pydantic import BaseModel
+
+
+class StandardSessionResponse(BaseModel):
+    """Standardized session response that all HeyGen avatar services will provide.
+
+    This contains the common fields that the client needs to operate,
+    while also storing the raw response for service-specific data access.
+
+    Parameters:
+        session_id (str): Unique identifier for the streaming session.
+        access_token (str): Token for accessing the session securely.
+        livekit_agent_token (str): Token for HeyGen’s audio agents(Pipecat).
+        ws_url (str): WebSocket URL for the session.
+        livekit_url (str): LiveKit server URL for the session.
+    """
+
+    session_id: str
+    access_token: str
+    livekit_agent_token: str
+
+    livekit_url: str = None
+    ws_url: str = None
+
+    raw_response: Any
+
+
+class BaseAvatarApi(ABC):
+    """Base class for avatar service APIs."""
+
+    @abstractmethod
+    async def new_session(self, request_data: Any) -> StandardSessionResponse:
+        """Create a new avatar session.
+
+        Args:
+            request_data: Service-specific session request data
+
+        Returns:
+            StandardSessionResponse: Standardized session information
+        """
+        pass
+
+    @abstractmethod
+    async def close_session(self, session_id: str) -> Any:
+        """Close an avatar session.
+
+        Args:
+            session_id: ID of the session to close
+
+        Returns:
+            Response data from the close session API call
+        """
+        pass