diff --git a/.idea/api-to-dataframe.iml b/.idea/api-to-dataframe.iml
index 17714ac..0de63f1 100644
--- a/.idea/api-to-dataframe.iml
+++ b/.idea/api-to-dataframe.iml
@@ -2,9 +2,10 @@
 <module type="PYTHON_MODULE" version="4">
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/.venv" />
     </content>
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="Python 3.9 (api-to-dataframe)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
   <component name="TestRunnerService">
diff --git a/pyproject.toml b/pyproject.toml
index 2e2ac28..06d0e55 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,13 +1,13 @@
 [tool.poetry]
 name = "api-to-dataframe"
-version = "0.0.11"
+version = "0.1.0"
 description = "A package to convert API responses to pandas dataframe"
 authors = ["IvanildoBarauna <ivanildo.jnr@outlook.com>"]
 readme = "README.md"
 license = "MIT"
 packages = [{ include = "api_to_dataframe", from = "src" }]
 classifiers=[
-    "Development Status :: 1 - Planning",
+    "Development Status :: 2 - Pre-Alpha",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
diff --git a/src/api_to_dataframe/__init__.py b/src/api_to_dataframe/__init__.py
index d425652..bf0ed9e 100644
--- a/src/api_to_dataframe/__init__.py
+++ b/src/api_to_dataframe/__init__.py
@@ -1 +1 @@
-from . import run as ApiToDataframe
\ No newline at end of file
+from api_to_dataframe.main import ClientBuilder
diff --git a/src/api_to_dataframe/main.py b/src/api_to_dataframe/main.py
new file mode 100644
index 0000000..0bd441d
--- /dev/null
+++ b/src/api_to_dataframe/main.py
@@ -0,0 +1,22 @@
+import requests
+import pandas as pd
+
+
+class ClientBuilder:
+    def __init__(self, endpoint: str):
+        if endpoint == "":
+            raise ValueError("::: endpoint param is mandatory :::")
+        else:
+            self.endpoint = endpoint
+
+    def _response_to_json(self):
+        response = requests.get(self.endpoint)
+
+        if response.ok:
+            return response.json()
+        else:
+            raise ConnectionError(response.status_code)
+
+    def to_dataframe(self):
+        df = pd.DataFrame([self._response_to_json()])
+        return df
diff --git a/src/api_to_dataframe/run.py b/src/api_to_dataframe/run.py
deleted file mode 100644
index d21d925..0000000
--- a/src/api_to_dataframe/run.py
+++ /dev/null
@@ -1,6 +0,0 @@
-class ApiToDataframe:
-    def __init__(self, name: str):
-        self.name = name
-
-    def say_hello(self):
-        print(f"Hello {self.name}")
diff --git a/tests/test_run.py b/tests/test_run.py
index 213ad10..612e84a 100644
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -1,5 +1,32 @@
 import pytest
-from src.api_to_dataframe import run
+import pandas as pd
+import api_to_dataframe as api_to_dataframe
 
-def test_main():
-    assert True
\ No newline at end of file
+
+@pytest.fixture()
+def setup():
+    new_client = api_to_dataframe.ClientBuilder(endpoint="https://economia.awesomeapi.com.br/last/USD-BRL")
+    return new_client
+
+
+def test_constructor_without_param():
+    with pytest.raises(ValueError):
+        new_client = api_to_dataframe.ClientBuilder(endpoint="")
+
+
+def test_constructor_with_param(setup):
+    expected_result = "https://economia.awesomeapi.com.br/last/USD-BRL"
+    new_client = setup
+    assert new_client.endpoint == expected_result
+
+
+def test_response_to_json(setup):
+    new_client = setup
+    response = new_client._response_to_json()
+    assert isinstance(response, dict)
+
+
+def test_to_dataframe(setup):
+    new_client = setup
+    df = new_client.to_dataframe()
+    assert isinstance(df, pd.DataFrame)