diff --git a/pdm.lock b/pdm.lock
index e8f2f0b..f49339f 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -5,7 +5,7 @@
 groups = ["default"]
 strategy = ["cross_platform", "inherit_metadata"]
 lock_version = "4.4.1"
-content_hash = "sha256:a4bebf92f9599ac0bbd9330c74e76f2aff5b1ca700909112d8bab68efb50e1ea"
+content_hash = "sha256:7722c3d89cc1895a68d1ca6e1fc303c8cd178fa8fca91410deb7ecb53027a9ac"
 
 [[package]]
 name = "annotated-types"
@@ -64,7 +64,7 @@ version = "0.4.6"
 requires_python = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 summary = "Cross-platform colored terminal text."
 groups = ["default"]
-marker = "platform_system == \"Windows\""
+marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
 files = [
     {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
@@ -163,6 +163,21 @@ files = [
     {file = "idna-3.6.tar.gz", hash = "sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca"},
 ]
 
+[[package]]
+name = "loguru"
+version = "0.7.2"
+requires_python = ">=3.5"
+summary = "Python logging made (stupidly) simple"
+groups = ["default"]
+dependencies = [
+    "colorama>=0.3.4; sys_platform == \"win32\"",
+    "win32-setctime>=1.0.0; sys_platform == \"win32\"",
+]
+files = [
+    {file = "loguru-0.7.2-py3-none-any.whl", hash = "sha256:003d71e3d3ed35f0f8984898359d65b79e5b21943f78af86aa5491210429b8eb"},
+    {file = "loguru-0.7.2.tar.gz", hash = "sha256:e671a53522515f34fd406340ee968cb9ecafbc4b36c679da03c18fd8d0bd51ac"},
+]
+
 [[package]]
 name = "openai"
 version = "1.14.0"
@@ -262,6 +277,17 @@ files = [
     {file = "pymongo-4.6.2.tar.gz", hash = "sha256:ab7d01ac832a1663dad592ccbd92bb0f0775bc8f98a1923c5e1a7d7fead495af"},
 ]
 
+[[package]]
+name = "python-dotenv"
+version = "1.0.1"
+requires_python = ">=3.8"
+summary = "Read key-value pairs from a .env file and set them as environment variables"
+groups = ["default"]
+files = [
+    {file = "python-dotenv-1.0.1.tar.gz", hash = "sha256:e324ee90a023d808f1959c46bcbc04446a10ced277783dc6ee09987c37ec10ca"},
+    {file = "python_dotenv-1.0.1-py3-none-any.whl", hash = "sha256:f7b63ef50f1b690dddf550d03497b66d609393b40b564ed0d674909a68ebf16a"},
+]
+
 [[package]]
 name = "sniffio"
 version = "1.3.1"
@@ -326,3 +352,15 @@ files = [
     {file = "uvicorn-0.28.0-py3-none-any.whl", hash = "sha256:6623abbbe6176204a4226e67607b4d52cc60ff62cda0ff177613645cefa2ece1"},
     {file = "uvicorn-0.28.0.tar.gz", hash = "sha256:cab4473b5d1eaeb5a0f6375ac4bc85007ffc75c3cc1768816d9e5d589857b067"},
 ]
+
+[[package]]
+name = "win32-setctime"
+version = "1.1.0"
+requires_python = ">=3.5"
+summary = "A small Python utility to set file creation time on Windows"
+groups = ["default"]
+marker = "sys_platform == \"win32\""
+files = [
+    {file = "win32_setctime-1.1.0-py3-none-any.whl", hash = "sha256:231db239e959c2fe7eb1d7dc129f11172354f98361c4fa2d6d2d7e278baa8aad"},
+    {file = "win32_setctime-1.1.0.tar.gz", hash = "sha256:15cf5750465118d6929ae4de4eb46e8edae9a5634350c01ba582df868e932cb2"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 25c5959..5de69c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,8 @@ dependencies = [
     "httpx>=0.27.0",
     "uvicorn>=0.28.0",
     "openai>=1.14.0",
+    "loguru>=0.7.2",
+    "python-dotenv>=1.0.1",
 ]
 requires-python = "==3.12.*"
 readme = "README.md"
diff --git a/src/simplylab/__init__.py b/simplylab/__init__.py
similarity index 100%
rename from src/simplylab/__init__.py
rename to simplylab/__init__.py
diff --git a/src/simplylab/conf.py b/simplylab/conf.py
similarity index 100%
rename from src/simplylab/conf.py
rename to simplylab/conf.py
diff --git a/src/simplylab/entity.py b/simplylab/entity.py
similarity index 100%
rename from src/simplylab/entity.py
rename to simplylab/entity.py
diff --git a/src/simplylab/main.py b/simplylab/main.py
similarity index 55%
rename from src/simplylab/main.py
rename to simplylab/main.py
index 33251d9..24a437c 100644
--- a/src/simplylab/main.py
+++ b/simplylab/main.py
@@ -1,15 +1,18 @@
 from typing import Union
 
 from fastapi import FastAPI
+from dotenv import load_dotenv
 
-from .entity import GetAiChatResponseInput
-from .entity import GetAiChatResponseOutput
-from .entity import GetUserChatHistoryInput
-from .entity import GetUserChatHistoryOutput
-from .entity import GetChatStatusTodayInput
-from .entity import GetChatStatusTodayOutput
-from .entity import UserChatMessage
+from simplylab.entity import GetAiChatResponseInput
+from simplylab.entity import GetAiChatResponseOutput
+from simplylab.entity import GetUserChatHistoryInput
+from simplylab.entity import GetUserChatHistoryOutput
+from simplylab.entity import GetChatStatusTodayInput
+from simplylab.entity import GetChatStatusTodayOutput
+from simplylab.entity import UserChatMessage
+from simplylab.services import Services
 
+load_dotenv()
 app = FastAPI()
 
 
@@ -20,7 +23,9 @@ async def read_root():
 
 @app.post("/api/v1/get_ai_chat_response")
 async def get_ai_chat_response(req: GetAiChatResponseInput) -> GetAiChatResponseOutput:
-    res = GetAiChatResponseOutput(response="Hello World")
+    svc = Services(req)
+    response = await svc.chat.get_ai_chat_response(req)
+    res = GetAiChatResponseOutput(response=response)
     return res
 
 
diff --git a/simplylab/providers/__init__.py b/simplylab/providers/__init__.py
new file mode 100644
index 0000000..f053819
--- /dev/null
+++ b/simplylab/providers/__init__.py
@@ -0,0 +1,11 @@
+from simplylab.providers.openrouter import OpenRouterProvider
+
+
+class Providers:
+
+    def __init__(self):
+        ...
+
+    @property
+    def openrouter(self):
+        return OpenRouterProvider()
diff --git a/simplylab/providers/openrouter.py b/simplylab/providers/openrouter.py
new file mode 100644
index 0000000..3d2cd7a
--- /dev/null
+++ b/simplylab/providers/openrouter.py
@@ -0,0 +1,32 @@
+from openai import OpenAI
+from os import getenv
+from loguru import logger
+
+
+class OpenRouterProvider:
+    def __init__(self):
+        ...
+
+    async def chat(self, content: str) -> str:
+        # gets API Key from environment variable OPENAI_API_KEY
+        api_key = getenv("OPENROUTER_API_KEY")
+        client = OpenAI(
+            base_url="https://openrouter.ai/api/v1",
+            api_key=api_key,
+        )
+
+        completion = client.chat.completions.create(
+            extra_headers={
+                # "HTTP-Referer": $YOUR_SITE_URL,  # Optional, for including your app on openrouter.ai rankings.
+                # "X-Title": $YOUR_APP_NAME,  # Optional. Shows in rankings on openrouter.ai.
+            },
+            model="mistralai/mistral-7b-instruct:free",
+            messages=[
+                {
+                    "role": "user",
+                    "content": content,
+                },
+            ],
+        )
+        print(completion.choices[0].message.content)
+        return completion.choices[0].message.content
diff --git a/simplylab/services/__init__.py b/simplylab/services/__init__.py
new file mode 100644
index 0000000..b95a51f
--- /dev/null
+++ b/simplylab/services/__init__.py
@@ -0,0 +1,12 @@
+from typing import Any
+
+from simplylab.services.chat import ChatService
+
+
+class Services:
+    def __init__(self, ctx: Any):
+        self.ctx = ctx
+
+    @property
+    def chat(self):
+        return ChatService(self.ctx)
diff --git a/simplylab/services/chat.py b/simplylab/services/chat.py
new file mode 100644
index 0000000..d4c7886
--- /dev/null
+++ b/simplylab/services/chat.py
@@ -0,0 +1,15 @@
+from typing import Any
+
+from simplylab.entity import GetAiChatResponseInput
+from simplylab.providers import Providers
+
+
+class ChatService:
+    def __init__(self, ctx: Any):
+        self.ctx = ctx
+
+    async def get_ai_chat_response(self, req: GetAiChatResponseInput) -> str:
+        pvd = Providers()
+        message = req.message
+        response_content = await pvd.openrouter.chat(content=message)
+        return response_content
diff --git a/src/simplylab/provider.py b/src/simplylab/provider.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/simplylab/service.py b/src/simplylab/service.py
deleted file mode 100644
index e69de29..0000000