Castorice-LLM-Service provides a standardized HTTP interface to interact with various large language model providers out of the box. Developers can configure multiple backends—including cloud APIs and self-hosted models—via environment variables or config files. It supports retrieval-augmented generation through seamless vector database integration, enabling context-aware responses. Features such as request batching optimize throughput and cost, while streaming endpoints deliver token-by-token responses. Built-in caching, RBAC, and Prometheus-compatible metrics help ensure secure, scalable, and observable deployment on-premises or in the cloud.