diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 73181b3..84f3118 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Python 3.8
+      - name: Set up Python 3.11
         uses: actions/setup-python@v3
         with:
-          python-version: 3.8
+          python-version: 3.11
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
diff --git a/README.md b/README.md
index fb207ac..0761e71 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,12 @@
 # ML pipelines
 
 Simple ML pipeline repo for experimenting with CI/CD / DevOps / MLOps.
+
+## To do
+
+- Use Python 3.11 in CI github action
+- make pipelines functions
+- add loggers to stuff
+- add db conn / func to save inference cases
+- add deployment code...
+- add versioning to training... in deployment?
diff --git a/ml_pipelines/logic/serve/serve.py b/ml_pipelines/logic/serve/serve.py
index 58fe643..2fc798f 100644
--- a/ml_pipelines/logic/serve/serve.py
+++ b/ml_pipelines/logic/serve/serve.py
@@ -1,5 +1,51 @@
-def validate_sample(sample: dict):
-    x1_upper_bound = 5
-    if sample["X1"] > x1_upper_bound:
-        return False
-    return True
+import pandas as pd
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel, Field
+from sklearn.linear_model import LogisticRegression
+
+from ml_pipelines.logic.common.feature_eng import (
+    FeatureEngineeringParams,
+    transform_features,
+)
+from ml_pipelines.logic.common.model import predict
+
+
+class Point(BaseModel):
+    prediction_id: str
+    x1: float = Field(..., description="Value of x1, must be smaller than 5", lt=5)
+    x2: float
+
+
+def create_fastapi_app(
+    model: LogisticRegression, feature_eng_params: FeatureEngineeringParams
+):
+    app = FastAPI()
+
+    @app.get("/predict/")
+    async def _(inputs: Point | list[Point]):
+        """
+        Endpoint to predict probabilities for the given list of points.
+        :param points: List of points (x1, x2) (or single point)
+        :return: List of probability predictions (or single prediction)
+        """
+        try:
+            single = False
+            if isinstance(inputs, Point):
+                single = True
+                inputs = [inputs]
+            # Convert the input points to a numpy array
+            x_matrix = pd.DataFrame([{"X1": p.x1, "X2": p.x2} for p in inputs])
+            x_matrix = transform_features(x_matrix, feature_eng_params)
+
+            # Make predictions using the pre-trained model
+            predictions = predict(model, x_matrix).tolist()
+
+            if single:
+                predictions = predictions[0]
+
+            return {"predictions": predictions}
+
+        except Exception:
+            raise HTTPException(status_code=500, detail="Internal server error")
+
+    return app