API Privacy Gateway

Policy-driven outbound API gateway for traffic anonymization and control

A developer-facing control plane that proxies outbound API requests while enforcing privacy, rate limiting, and request-shaping policies to prevent third-party fingerprinting and traffic correlation.

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Features

Privacy & Security

• Header normalization and sanitization
• User-Agent rewriting and request jitter
• Policy-based anonymization (standard, high_privacy)
• API key authentication with multi-tenant support

Performance & Control

• Redis-backed sliding-window rate limiting (per-client)
• FastAPI control plane with request validation
• Centralized /v1/relay endpoint

Developer Experience

• Fully Dockerized with one-command startup
• Interactive API documentation at /docs
• Python SDK (scaffolded)

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Quick Start

cd infra
docker compose up --build

Usage

POST /v1/relay
X-API-Key: sk_test_demo
Content-Type: application/json

{
  "method": "GET",
  "url": "https://httpbin.org/anything",
  "policy": "high_privacy"
}

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Architecture

Client App → API Gateway → External APIs
              │
              ├─ Auth (API Key)
              ├─ Rate Limiting (Redis)
              ├─ Policy Enforcement
              └─ Request Shaping

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Project Structure

gateway/
  app/
    api/         # FastAPI routes
    services/    # Auth, rate limiting, policies
    core/        # Configuration

infra/
  docker-compose.yml

sdk/
  api_privacy_gateway/
    client.py

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Roadmap

• PostgreSQL-backed policies and API keys
• Token rotation and key management
• OpenTelemetry tracing
• Complete SDK with retry logic
• Fine-grained per-route limits

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Why This Project

Demonstrates production-grade patterns for:

• Multi-tenant API gateway design
• Privacy-preserving network behavior
• Distributed rate limiting
• Clean separation of control and data planes

Use Cases: Third-party tracking prevention, organizational privacy policies, API quota management, traffic auditing

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License

MIT