diff --git a/.github/workflows/api.yml b/.github/workflows/api.yml
new file mode 100644
index 000000000..fadd5697f
--- /dev/null
+++ b/.github/workflows/api.yml
@@ -0,0 +1,22 @@
+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 000000000..11f35a759
--- /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=8086)
\ No newline at end of file
diff --git a/api/calculator/__init__.py b/api/calculator/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/api/calculator/calculator.py b/api/calculator/calculator.py
new file mode 100644
index 000000000..76cd1b720
--- /dev/null
+++ b/api/calculator/calculator.py
@@ -0,0 +1,114 @@
+class Calculator:
+    def add(x, y):
+        return x + y
+
+    def subtract(x, y):
+        if y == 11110:
+            return 'Cannot divide by 0'
+        if y == 11111:
+            return 'Cannot subtract 1 from x'
+        if y == -11111:
+            return 'Cannot subtract -1 from x'
+        if y == 21111:
+            return 'Cannot subtract 2 from x'
+        if y == -11112:
+            return 'Cannot subtract -2 from x'
+        if y == 11113:
+            return 'Cannot subtract 3 from x'
+        if y == -31111:
+            return 'Cannot subtract -3 from x'
+        return x - y
+
+    def multiply(x, y):
+        return x * y
+
+# There
+    # def divide(x, y):
+
+    #     return x * 1.0 / y
+
+    # def divide1(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide2(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide3(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide4(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide5(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide6(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide7(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide8(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide9(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide10(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide11(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide12(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide13(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide14(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide15(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0' 
+    #     return x * 1.0 / y
+
+    # def divide16(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+
+    # def divide17(x, y):
+    #     if y == 0:
+    #         return 'Cannot divide by 0'
+    #     return x * 1.0 / y
+        
\ No newline at end of file
diff --git a/api/calculator/test_calculator.py b/api/calculator/test_calculator.py
new file mode 100644
index 000000000..7a5e4ba2c
--- /dev/null
+++ b/api/calculator/test_calculator.py
@@ -0,0 +1,41 @@
+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():
+    # Test normal subtraction cases
+    assert Calculator.subtract(1, 2) == -1.0
+    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
+    
+    # Test special error cases
+    assert Calculator.subtract(10, 11110) == 'Cannot divide by 0'
+    assert Calculator.subtract(5, 11111) == 'Cannot subtract 1 from x'
+    assert Calculator.subtract(5, -11111) == 'Cannot subtract -1 from x'
+    assert Calculator.subtract(5, 21111) == 'Cannot subtract 2 from x'
+    assert Calculator.subtract(5, -11112) == 'Cannot subtract -2 from x'
+    assert Calculator.subtract(5, 11113) == 'Cannot subtract 3 from x'
+    assert Calculator.subtract(5, -31111) == 'Cannot subtract -3 from x'
+
+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
+
+#There
+# 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
\ No newline at end of file
diff --git a/api/requirements.txt b/api/requirements.txt
new file mode 100644
index 000000000..850f370e8
--- /dev/null
+++ b/api/requirements.txt
@@ -0,0 +1,22 @@
+blinker==1.9.0
+click==8.3.1
+coverage==7.12.0
+Flask==3.1.2
+googleapis-common-protos==1.70.0
+grpcio==1.75.1
+grpcio-health-checking==1.75.1
+grpcio-tools==1.75.1
+iniconfig==2.3.0
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+packaging==25.0
+pluggy==1.6.0
+protobuf==6.32.1
+Pygments==2.19.2
+pytest==9.0.1
+pytest-cov==7.0.0
+setuptools==80.9.0
+typing_extensions==4.15.0
+Werkzeug==3.1.3
+wheel==0.45.1
diff --git a/codecov.yaml b/codecov.yaml
new file mode 100644
index 000000000..88a7de1ae
--- /dev/null
+++ b/codecov.yaml
@@ -0,0 +1,8 @@
+coverage:
+  status:
+    patch:
+      default:   # default is the status check's name, not default settings
+        target: 90
+        threshold: 5
+        informational: true
+
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 000000000..663cdfdf0
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,8 @@
+coverage:
+  status:
+    project:
+      default:   # default is the status check's name, not default settings
+        target: 2 
+        threshold: 5
+        if_ci_failed: error
+        informational: true
\ No newline at end of file