RouteMux

RouteMux is a reliability-first AI gateway. One API key and one endpoint reach models from OpenAI, Anthropic, Google, xAI, DeepSeek, Alibaba and other providers, compatible with OpenAI Chat Completions and Responses, Anthropic Messages and Google Vertex. Requests run over redundant upstream routes, and only successful requests are billed. Prepaid pay-as-you-go, starting at $10.