diff --git a/.github/workflows/api.yml b/.github/workflows/api.yml
new file mode 100644
index 00000000..565c13eb
--- /dev/null
+++ b/.github/workflows/api.yml
@@ -0,0 +1,21 @@
+name: API workflow
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Test python API
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+    - name: Install requirements
+      run: pip install -r api/requirements.txt
+    - name: Run tests and collect coverage
+      run: pytest --cov=api.calculator --cov-report=xml
+    - name: Upload coverage reports to Codecov with GitHub Action
+      uses: codecov/codecov-action@v5
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/api/app.py b/api/app.py
new file mode 100644
index 00000000..d91792d1
--- /dev/null
+++ b/api/app.py
@@ -0,0 +1,35 @@
+from flask import (
+    Flask,
+    request,
+)
+
+from calculator.calculator import Calculator
+
+app = Flask(__name__)
+
+@app.route('/api/add', methods=['POST'])
+def add():
+    return operation('add', 2)
+
+@app.route('/api/subtract', methods=['POST'])
+def subtract():
+    return operation('subtract', 2)
+
+@app.route('/api/multiply', methods=['POST'])
+def multiply():
+    return operation('multiply', 2)
+
+@app.route('/api/divide', methods=['POST'])
+def divide():
+    return operation('divide', 2)
+
+def operation(method, num_factors):
+    factors = []
+    if num_factors == 2:
+        factors.append(float(request.json.get('x')))
+        factors.append(float(request.json.get('y')))
+
+    return str(getattr(Calculator, method)(*factors))
+
+
+app.run(host='0.0.0.0', port=8080)
\ No newline at end of file
diff --git a/api/calculator/__init__.py b/api/calculator/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/api/calculator/calculator.py b/api/calculator/calculator.py
new file mode 100644
index 00000000..fc061a99
--- /dev/null
+++ b/api/calculator/calculator.py
@@ -0,0 +1,23 @@
+class Calculator:
+    def add(x, y):
+        return x + y
+
+    def subtract(x, y):
+        return x - y
+
+    def multiply(x, y):
+        return x * y
+
+    def divide(x, y):
+        if y == 0:
+            return 'Cannot divide by 0'
+        return x * 1.0 / y
+
+    def power(x, y):
+        return x ** y
+
+    def modulo(x, y):
+        if y == 0:
+            return 'Cannot modulo by 0'
+        return x % y
+# local-codecov-pr-probe
diff --git a/api/calculator/test_calculator.py b/api/calculator/test_calculator.py
new file mode 100644
index 00000000..72656d2d
--- /dev/null
+++ b/api/calculator/test_calculator.py
@@ -0,0 +1,40 @@
+from .calculator import Calculator
+
+
+def test_add():
+    assert Calculator.add(1, 2) == 3.0
+    assert Calculator.add(1.0, 2.0) == 3.0
+    assert Calculator.add(0, 2.0) == 2.0
+    assert Calculator.add(2.0, 0) == 2.0
+    assert Calculator.add(-4, 2.0) == -2.0
+
+def test_subtract():
+    assert Calculator.subtract(2, 2) == 0
+    assert Calculator.subtract(2, 1) == 1.0
+    assert Calculator.subtract(1.0, 2.0) == -1.0
+    assert Calculator.subtract(0, 2.0) == -2.0
+    assert Calculator.subtract(2.0, 0.0) == 2.0
+    assert Calculator.subtract(-4, 2.0) == -6.0
+
+def test_multiply():
+    assert Calculator.multiply(1, 2) == 2.0
+    assert Calculator.multiply(1.0, 2.0) == 2.0
+    assert Calculator.multiply(0, 2.0) == 0.0
+    assert Calculator.multiply(2.0, 0.0) == 0.0
+    assert Calculator.multiply(-4, 2.0) == -8.0
+
+def test_divide():
+    assert Calculator.divide(1, 2) == 0.5
+    assert Calculator.divide(1.0, 2.0) == 0.5
+    assert Calculator.divide(0, 2.0) == 0
+    assert Calculator.divide(-4, 2.0) == -2.0
+
+
+def test_divide_by_0():
+    assert Calculator.divide(2.0, 0) == 'Cannot divide by 0'    
+
+
+def test_power():
+    assert Calculator.power(2, 3) == 8
+    assert Calculator.power(5, 0) == 1
+# codecov baseline test
diff --git a/api/requirements.txt b/api/requirements.txt
new file mode 100644
index 00000000..cae20d9e
--- /dev/null
+++ b/api/requirements.txt
@@ -0,0 +1,3 @@
+flask
+pytest
+pytest-cov
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 00000000..22fb8981
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,10 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 100%
+        threshold: 1%
+
+comment:
+  layout: "newheader, diff, files, newfooter"
+  hide_project_coverage: false
\ No newline at end of file