README.md

---
title: Real-Time Fraud Detection
emoji: 🛡️
colorFrom: green
colorTo: blue
sdk: gradio
sdk_version: 5.50.0
app_file: app.py
pinned: false
license: mit
---

# 🛡️ Real-Time Credit Card Fraud Detection

End-to-end fraud detection on the Sparkov dataset (1.85M transactions, ~0.5% fraud):

- **Feature engineering** — leakage-safe velocity, behavioral, and geo features
- **Imbalance study** — cost-sensitive vs SMOTE vs undersampling (honest comparison)
- **Three models** — LightGBM (PR-AUC 0.97) · GraphSAGE GNN · Autoencoder
- **SHAP explainability** — per-transaction reasons for compliance
- **Concept-drift monitoring** — PSI early warning
- **Real-time scoring** — single-digit-millisecond latency

Source: [github.com/Fikri645/fraud-detection](https://github.com/Fikri645/fraud-detection)

Built by [Muhammad Fikri Wahidin](https://github.com/Fikri645).