BricksLLM

Enterprise-grade API gateway that helps you monitor and impose cost or rate limits per API key. Get fine-grained access control and monitoring per user, application, or environment. Supports OpenAI, Azure OpenAI, Anthropic, vLLM, and open-source LLMs. Maintained by bricks-cloud on GitHub, where it has earned 1,217 stars from the community.

It's actively developed around ai, anthropic, api, and is a solid reference for anyone building with these tools.