Sub2API

AI API Gateway Platform for Subscription Quota Distribution

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Demo

Try Sub2API online: https://v2.pincc.ai/

Demo credentials (shared demo environment; not created automatically for self-hosted installs):

Email	Password
admin@sub2api.com	admin123

Overview

Sub2API is an AI API gateway platform designed to distribute and manage API quotas from AI product subscriptions (like Claude Code $200/month). Users can access upstream AI services through platform-generated API Keys, while the platform handles authentication, billing, load balancing, and request forwarding.

Features

• Multi-Account Management - Support multiple upstream account types (OAuth, API Key)
• API Key Distribution - Generate and manage API Keys for users
• Precise Billing - Token-level usage tracking and cost calculation
• Smart Scheduling - Intelligent account selection with sticky sessions
• Concurrency Control - Per-user and per-account concurrency limits
• Rate Limiting - Configurable request and token rate limits
• Admin Dashboard - Web interface for monitoring and management

Tech Stack

Component	Technology
Backend	Go 1.25.5, Gin, Ent
Frontend	Vue 3.4+, Vite 5+, TailwindCSS
Database	PostgreSQL 15+
Cache/Queue	Redis 7+

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Documentation

• Dependency Security: docs/dependency-security.md

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Deployment

Method 1: Script Installation (Recommended)

One-click installation script that downloads pre-built binaries from GitHub Releases.

Prerequisites

• Linux server (amd64 or arm64)
• PostgreSQL 15+ (installed and running)
• Redis 7+ (installed and running)
• Root privileges

Installation Steps

curl -sSL https://raw.githubusercontent.com/Wei-Shaw/sub2api/main/deploy/install.sh | sudo bash

The script will:

1. Detect your system architecture
2. Download the latest release
3. Install binary to /opt/sub2api
4. Create systemd service
5. Configure system user and permissions

Post-Installation

# 1. Start the service
sudo systemctl start sub2api

# 2. Enable auto-start on boot
sudo systemctl enable sub2api

# 3. Open Setup Wizard in browser
# http://YOUR_SERVER_IP:8080

The Setup Wizard will guide you through:

• Database configuration
• Redis configuration
• Admin account creation

Upgrade

You can upgrade directly from the Admin Dashboard by clicking the Check for Updates button in the top-left corner.

The web interface will:

• Check for new versions automatically
• Download and apply updates with one click
• Support rollback if needed

Useful Commands

# Check status
sudo systemctl status sub2api

# View logs
sudo journalctl -u sub2api -f

# Restart service
sudo systemctl restart sub2api

# Uninstall
curl -sSL https://raw.githubusercontent.com/Wei-Shaw/sub2api/main/deploy/install.sh | sudo bash -s -- uninstall -y

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Method 2: Docker Compose

Deploy with Docker Compose, including PostgreSQL and Redis containers.

Prerequisites

• Docker 20.10+
• Docker Compose v2+

Installation Steps

# 1. Clone the repository
git clone https://github.com/Wei-Shaw/sub2api.git
cd sub2api

# 2. Enter the deploy directory
cd deploy

# 3. Copy environment configuration
cp .env.example .env

# 4. Edit configuration (set your passwords)
nano .env

Required configuration in .env:

# PostgreSQL password (REQUIRED - change this!)
POSTGRES_PASSWORD=your_secure_password_here

# Optional: Admin account
ADMIN_EMAIL=admin@example.com
ADMIN_PASSWORD=your_admin_password

# Optional: Custom port
SERVER_PORT=8080

# Optional: Security configuration
# Enable URL allowlist validation (false to skip allowlist checks, only basic format validation)
SECURITY_URL_ALLOWLIST_ENABLED=false

# Allow insecure HTTP URLs when allowlist is disabled (default: false, requires https)
# ⚠️ WARNING: Enabling this allows HTTP (plaintext) URLs which can expose API keys
#             Only recommended for:
#             - Development/testing environments
#             - Internal networks with trusted endpoints
#             - When using local test servers (http://localhost)
# PRODUCTION: Keep this false or use HTTPS URLs only
SECURITY_URL_ALLOWLIST_ALLOW_INSECURE_HTTP=false

# Allow private IP addresses for upstream/pricing/CRS (for internal deployments)
SECURITY_URL_ALLOWLIST_ALLOW_PRIVATE_HOSTS=false

# 5. Start all services
docker-compose up -d

# 6. Check status
docker-compose ps

# 7. View logs
docker-compose logs -f sub2api

Access

Open http://YOUR_SERVER_IP:8080 in your browser.

Upgrade

# Pull latest image and recreate container
docker-compose pull
docker-compose up -d

Useful Commands

# Stop all services
docker-compose down

# Restart
docker-compose restart

# View all logs
docker-compose logs -f

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Method 3: Build from Source

Build and run from source code for development or customization.

Prerequisites

• Go 1.21+
• Node.js 18+
• PostgreSQL 15+
• Redis 7+

Build Steps

# 1. Clone the repository
git clone https://github.com/Wei-Shaw/sub2api.git
cd sub2api

# 2. Install pnpm (if not already installed)
npm install -g pnpm

# 3. Build frontend
cd frontend
pnpm install
pnpm run build
# Output will be in ../backend/internal/web/dist/

# 4. Build backend with embedded frontend
cd ../backend
go build -tags embed -o sub2api ./cmd/server

# 5. Create configuration file
cp ../deploy/config.example.yaml ./config.yaml

# 6. Edit configuration
nano config.yaml

Note: The -tags embed flag embeds the frontend into the binary. Without this flag, the binary will not serve the frontend UI.

Key configuration in config.yaml:

server:
  host: "0.0.0.0"
  port: 8080
  mode: "release"

database:
  host: "localhost"
  port: 5432
  user: "postgres"
  password: "your_password"
  dbname: "sub2api"

redis:
  host: "localhost"
  port: 6379
  password: ""

jwt:
  secret: "change-this-to-a-secure-random-string"
  expire_hour: 24

default:
  user_concurrency: 5
  user_balance: 0
  api_key_prefix: "sk-"
  rate_multiplier: 1.0

Additional security-related options are available in config.yaml:

• cors.allowed_origins for CORS allowlist
• security.url_allowlist for upstream/pricing/CRS host allowlists
• security.url_allowlist.enabled to disable URL validation (use with caution)
• security.url_allowlist.allow_insecure_http to allow HTTP URLs when validation is disabled
• security.url_allowlist.allow_private_hosts to allow private/local IP addresses
• security.response_headers.enabled to enable configurable response header filtering (disabled uses default allowlist)
• security.csp to control Content-Security-Policy headers
• billing.circuit_breaker to fail closed on billing errors
• server.trusted_proxies to enable X-Forwarded-For parsing
• turnstile.required to require Turnstile in release mode

⚠️ Security Warning: HTTP URL Configuration

When security.url_allowlist.enabled=false, the system performs minimal URL validation by default, rejecting HTTP URLs and only allowing HTTPS. To allow HTTP URLs (e.g., for development or internal testing), you must explicitly set:

security:
  url_allowlist:
    enabled: false                # Disable allowlist checks
    allow_insecure_http: true     # Allow HTTP URLs (⚠️ INSECURE)

Or via environment variable:

SECURITY_URL_ALLOWLIST_ENABLED=false
SECURITY_URL_ALLOWLIST_ALLOW_INSECURE_HTTP=true

Risks of allowing HTTP:

• API keys and data transmitted in plaintext (vulnerable to interception)
• Susceptible to man-in-the-middle (MITM) attacks
• NOT suitable for production environments

When to use HTTP:

• ✅ Development/testing with local servers (http://localhost)
• ✅ Internal networks with trusted endpoints
• ✅ Testing account connectivity before obtaining HTTPS
• ❌ Production environments (use HTTPS only)

Example error without this setting:

Invalid base URL: invalid url scheme: http

If you disable URL validation or response header filtering, harden your network layer:

• Enforce an egress allowlist for upstream domains/IPs
• Block private/loopback/link-local ranges
• Enforce TLS-only outbound traffic
• Strip sensitive upstream response headers at the proxy

# 6. Run the application
./sub2api

Development Mode

# Backend (with hot reload)
cd backend
go run ./cmd/server

# Frontend (with hot reload)
cd frontend
pnpm run dev

Code Generation

When editing backend/ent/schema, regenerate Ent + Wire:

cd backend
go generate ./ent
go generate ./cmd/server

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Simple Mode

Simple Mode is designed for individual developers or internal teams who want quick access without full SaaS features.

• Enable: Set environment variable RUN_MODE=simple
• Difference: Hides SaaS-related features and skips billing process
• Security note: In production, you must also set SIMPLE_MODE_CONFIRM=true to allow startup

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Antigravity Support

Sub2API supports Antigravity accounts. After authorization, dedicated endpoints are available for Claude and Gemini models.

Dedicated Endpoints

Endpoint	Model
/antigravity/v1/messages	Claude models
/antigravity/v1beta/	Gemini models

Claude Code Configuration

export ANTHROPIC_BASE_URL="http://localhost:8080/antigravity"
export ANTHROPIC_AUTH_TOKEN="sk-xxx"

Hybrid Scheduling Mode

Antigravity accounts support optional hybrid scheduling. When enabled, the general endpoints /v1/messages and /v1beta/ will also route requests to Antigravity accounts.

⚠️ Warning: Anthropic Claude and Antigravity Claude cannot be mixed within the same conversation context. Use groups to isolate them properly.

Known Issues

In Claude Code, Plan Mode cannot exit automatically. (Normally when using the native Claude API, after planning is complete, Claude Code will pop up options for users to approve or reject the plan.)

Workaround: Press Shift + Tab to manually exit Plan Mode, then type your response to approve or reject the plan.

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Project Structure

sub2api/
├── backend/                  # Go backend service
│   ├── cmd/server/           # Application entry
│   ├── internal/             # Internal modules
│   │   ├── config/           # Configuration
│   │   ├── model/            # Data models
│   │   ├── service/          # Business logic
│   │   ├── handler/          # HTTP handlers
│   │   └── gateway/          # API gateway core
│   └── resources/            # Static resources
│
├── frontend/                 # Vue 3 frontend
│   └── src/
│       ├── api/              # API calls
│       ├── stores/           # State management
│       ├── views/            # Page components
│       └── components/       # Reusable components
│
└── deploy/                   # Deployment files
    ├── docker-compose.yml    # Docker Compose configuration
    ├── .env.example          # Environment variables for Docker Compose
    ├── config.example.yaml   # Full config file for binary deployment
    └── install.sh            # One-click installation script

License

MIT License

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