---
title: KYC POC Backend
emoji: 🔐
colorFrom: blue
colorTo: purple
sdk: docker
app_port: 7860
pinned: false
license: mit
---

# KYC POC API

A proof-of-concept API for KYC (Know Your Customer) verification using:
- **AuraFace** for face recognition and matching
- **Silent-Face-Anti-Spoofing** for liveness detection

## Features

- Face matching between KTP (ID card) and selfie
- Liveness detection to prevent spoofing attacks
- Face quality analysis (blur, brightness, pose)
- Age and gender estimation
- Automatic face extraction from KTP images
- Multiple faces rejection

## Requirements

- Python 3.9+
- Git (for cloning Silent-Face-Anti-Spoofing)

## Installation

### 1. Create Virtual Environment

```bash
# Windows
python -m venv venv
venv\Scripts\activate

# Linux/Mac
python -m venv venv
source venv/bin/activate
```

### 2. Install Dependencies

```bash
pip install -r requirements.txt
```

### 3. Download ML Models

Run the setup script to download the required models:

```bash
python setup_models.py
```

This will:
- Download AuraFace model from HuggingFace
- Clone Silent-Face-Anti-Spoofing repository
- Copy model files to the correct locations

### 4. Run the Application

```bash
uvicorn app.main:app --reload --host 0.0.0.0 --port 8000
```

The API will be available at: http://localhost:8000

## API Documentation

- **Swagger UI**: http://localhost:8000/docs
- **ReDoc**: http://localhost:8000/redoc

## API Endpoints

### Health Check

```
GET /health
```

### File Upload Endpoints

These endpoints accept `multipart/form-data`:

| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/v1/kyc/verify` | POST | Full KYC verification |
| `/api/v1/kyc/face-match` | POST | Face matching only |
| `/api/v1/kyc/liveness` | POST | Liveness detection only |
| `/api/v1/kyc/quality` | POST | Face quality check only |

### Base64 Endpoints

These endpoints accept `application/json` with base64 encoded images:

| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/v1/kyc/base64/verify` | POST | Full KYC verification |
| `/api/v1/kyc/base64/face-match` | POST | Face matching only |
| `/api/v1/kyc/base64/liveness` | POST | Liveness detection only |
| `/api/v1/kyc/base64/quality` | POST | Face quality check only |

## Usage Examples

### Using curl (File Upload)

**Full KYC Verification:**
```bash
curl -X POST "http://localhost:8000/api/v1/kyc/verify" \
  -F "ktp_image=@/path/to/ktp.jpg" \
  -F "selfie_image=@/path/to/selfie.jpg" \
  -F "threshold=0.5"
```

**Face Match Only:**
```bash
curl -X POST "http://localhost:8000/api/v1/kyc/face-match" \
  -F "ktp_image=@/path/to/ktp.jpg" \
  -F "selfie_image=@/path/to/selfie.jpg"
```

**Liveness Check:**
```bash
curl -X POST "http://localhost:8000/api/v1/kyc/liveness" \
  -F "image=@/path/to/selfie.jpg"
```

### Using Insomnia/Postman (Base64)

**Full KYC Verification:**

```http
POST /api/v1/kyc/base64/verify
Content-Type: application/json

{
  "ktp_image": "base64_encoded_ktp_image_here...",
  "selfie_image": "base64_encoded_selfie_image_here...",
  "threshold": 0.5
}
```

**Face Match Only:**

```http
POST /api/v1/kyc/base64/face-match
Content-Type: application/json

{
  "image1": "base64_encoded_image1_here...",
  "image2": "base64_encoded_image2_here...",
  "threshold": 0.5
}
```

**Liveness Check:**

```http
POST /api/v1/kyc/base64/liveness
Content-Type: application/json

{
  "image": "base64_encoded_image_here..."
}
```

**Quality Check:**

```http
POST /api/v1/kyc/base64/quality
Content-Type: application/json

{
  "image": "base64_encoded_image_here..."
}
```

## Response Examples

### Successful Verification

```json
{
  "success": true,
  "face_match": {
    "is_match": true,
    "similarity_score": 0.87,
    "threshold": 0.5
  },
  "liveness": {
    "is_real": true,
    "confidence": 0.95,
    "label": "Real Face",
    "prediction_class": 1,
    "models_used": 2
  },
  "quality": {
    "ktp": {
      "blur_score": 125.5,
      "is_blurry": false,
      "brightness": 0.65,
      "is_too_dark": false,
      "is_too_bright": false,
      "is_good_quality": true
    },
    "selfie": {
      "blur_score": 200.3,
      "is_blurry": false,
      "brightness": 0.58,
      "is_too_dark": false,
      "is_too_bright": false,
      "pose": {
        "yaw": 5.2,
        "pitch": -3.1,
        "roll": 1.5,
        "is_frontal": true
      },
      "is_good_quality": true
    }
  },
  "demographics": {
    "ktp": { "age": 28, "gender": "Male" },
    "selfie": { "age": 29, "gender": "Male" }
  },
  "face_boxes": {
    "ktp": { "x": 120, "y": 80, "width": 150, "height": 180 },
    "selfie": { "x": 200, "y": 100, "width": 250, "height": 300 }
  },
  "message": "KYC verification successful"
}
```

### Error Response

```json
{
  "error_code": "FACE_NOT_DETECTED",
  "message": "No face detected in image"
}
```

## Error Codes

| Code | HTTP | Description |
|------|------|-------------|
| `FACE_NOT_DETECTED` | 400 | No face found in uploaded image |
| `MULTIPLE_FACES_DETECTED` | 400 | Multiple faces detected - rejected |
| `LIVENESS_FAILED` | 400 | Spoofing attempt detected |
| `IMAGE_INVALID` | 400 | Invalid or corrupt image file |
| `IMAGE_TOO_LARGE` | 413 | Image exceeds size limit |
| `UNSUPPORTED_FORMAT` | 415 | Image format not JPEG/PNG |
| `MODEL_NOT_LOADED` | 503 | ML models not initialized |

## Configuration

Configuration can be set via environment variables or `.env` file:

| Variable | Default | Description |
|----------|---------|-------------|
| `DEBUG` | `true` | Enable debug mode |
| `FACE_MATCH_THRESHOLD` | `0.5` | Face similarity threshold |
| `LIVENESS_THRESHOLD` | `0.5` | Liveness confidence threshold |
| `BLUR_THRESHOLD` | `100.0` | Blur detection threshold |
| `BRIGHTNESS_MIN` | `0.2` | Minimum brightness |
| `BRIGHTNESS_MAX` | `0.8` | Maximum brightness |
| `USE_GPU` | `false` | Enable GPU acceleration |
| `MAX_IMAGE_SIZE_MB` | `10.0` | Maximum upload size |

## Project Structure

```
sentinel/
├── app/
│   ├── __init__.py
│   ├── main.py                    # FastAPI application entry point
│   ├── config.py                  # Configuration settings
│   ├── api/
│   │   ├── __init__.py
│   │   ├── dependencies.py        # Shared dependencies
│   │   └── routes/
│   │       ├── __init__.py
│   │       ├── health.py          # Health check endpoint
│   │       ├── kyc.py             # File upload endpoints
│   │       └── kyc_base64.py      # Base64 endpoints
│   ├── services/
│   │   ├── __init__.py
│   │   ├── face_recognition.py    # AuraFace service
│   │   ├── face_quality.py        # Quality analysis service
│   │   └── liveness_detection.py  # Anti-spoofing service
│   ├── models/
│   │   ├── __init__.py
│   │   └── schemas.py             # Pydantic models
│   └── utils/
│       ├── __init__.py
│       ├── image_utils.py         # Image processing
│       └── ktp_extractor.py       # KTP face extraction
├── models/                        # ML model files
│   ├── auraface/                  # AuraFace model
│   └── anti_spoof/                # Anti-spoofing models
├── Silent-Face-Anti-Spoofing/     # Cloned repository
├── requirements.txt
├── setup_models.py                # Model download script
└── README.md
```

## Notes

- AuraFace produces 512-dimensional face embeddings
- Similarity threshold of 0.5 is balanced; increase for higher security
- Silent-Face-Anti-Spoofing uses 2 models for fusion (MiniFASNetV1SE + MiniFASNetV2)
- First request may be slow due to model warm-up
- CPU mode is used by default; set `USE_GPU=true` for GPU acceleration

## License

This is a proof-of-concept for educational purposes.