Gateway as a Platform
Assistant Billing
Build and run your own AI gateway with built-in billing. Open-source infrastructure for routing, payments, analytics, and a React component library for your customer-facing frontend.
OpenAI and Anthropic APIs
$ curl https://gateway.assistant-billing.dev/v1/chat/completions \
-H "Authorization: Bearer sk_ab_..." \
-d '{"model": "gpt-4o", "messages": [{"role": "user", "content": "Hello"}]}'Getting Started
Set up your project in 5 steps
How It Works
Architecture, billing flows, routing
API Reference
Customers, checkout, stats, settings
Features
Multi-Provider Routing
Route to 100+ AI models across OpenAI, Anthropic, Google, and more. Priority, round-robin, cost-optimized, or latency-based strategies with automatic failover.
Two-Level Billing
Separate balances for you and your customers. Stripe integration, per-request cost deduction, configurable markup and platform fees.
Customer Management
Identify customers by external reference — bring your own auth. Track balances, usage, and transactions per customer or team.
Frontend Components
@assistant-billing/react provides headless React primitives for wallet, API keys, and provider management. Built-in SSR support.
Real-Time Analytics
Per-request logging with cost, latency, token usage, and cache status. Daily aggregation for dashboard charts.
Open Source
Self-host the entire stack. Next.js dashboard, Cloudflare Workers APIs, PostgreSQL. Deploy anywhere.