{"service":"LLM API Gateway (User Auth)","version":"2.0.0","endpoints":["/v1/chat/completions - OpenAI-compatible chat completions (routes by model)","/v1/messages - Claude-style messages (Anthropic)","/v1/responses - OpenAI Responses API","/v1/usage - Get current user credit balances and available models","/health - Health check"],"authentication":"Required: X-Auth-Token header or Authorization: Bearer <session_token>"}