Free API Relay · API VPN · OpenAI Compatible
Free API Relay Guide: Setup, Limits, No-Card Tests, and China Access
A practical guide for API relay, API proxy, API VPN, free model routing, OpenAI-compatible LLM endpoints, no-card testing, pricing, limits, and safe production setup.
Three common API relay routes
Official API + OpenAI SDK
DeepSeek, Qwen, Hunyuan, and NVIDIA Build can be used with OpenAI-compatible or similar SDK patterns.
Free-tier aggregation
FreeLLMAPI, LiteLLM, and One-API can unify multiple free tiers for experiments and internal tools.
Commercial relay
Use one owned gateway for GPT, Claude, Gemini, DeepSeek, and Qwen when you need stronger billing, logs, fallback, and support.
Quick answers
Is an API VPN the same as an API relay?
No. A VPN changes network routing; an API relay gives you a compatible endpoint, keys, billing, model routing, and fallback behavior.
What should developers check first?
Check base URL compatibility, rate limits, model availability, retry behavior, logs, and whether the provider works from your target region.
When should you avoid relays?
Avoid unknown relays for sensitive data. For production, prefer official APIs, self-hosted gateways, or an owned platform with clear billing and logs.