LLM API Key Proxy is a universal LLM gateway: one API in front of every large language model provider you use. It exposes OpenAI- and Anthropic-compatible endpoints, translates requests between provider formats, and balances traffic across your API keys so a single rate-limited key does not break your app. The project has about 557 stars on GitHub and was updated in September 2026.
The proxy solves the everyday mess of multi-provider development: different request formats, incompatible error shapes, and keys that hit quota at the worst moment. Point your application at the proxy’s compatible endpoint and it routes each request to the configured provider, translating between formats including the Gemini API, and spreading load intelligently across multiple keys and providers. The same code doubles as a resilience library for Python applications, so retry, rotation and failover logic can live inside your app instead of a separate service. It is a community project, supported through Ko-fi, aimed at developers who juggle several providers and want one stable integration point.
Configuration is driven by the providers and keys you supply, and because the proxy presents familiar OpenAI-style endpoints, most existing client libraries and tools can be pointed at it without code changes, which makes adoption incremental rather than a rewrite.
LLM API Key Proxy is free to self-host from GitHub; check the repository for its license terms. You pay only for the underlying model APIs you route through it.
LLM API Key Proxy is for developers and small teams who work with several LLM providers and API keys and want a single, resilient integration point for their applications.