RouteMux is an AI gateway and router that provides unified access to hundreds of AI models from multiple providers through a single API and API key. It supports OpenAI, Anthropic, and Vertex compatible protocols, allowing teams to route text, image, and video workloads without maintaining separate integrations for each vendor. The service uses a prepaid wallet model with unified credits shared across model families, charges only for successful requests, and allows users to request a refund of any unused balance. There are no subscriptions or seat fees. The platform includes health-aware routing across vendors and a multi-layer redundancy architecture spanning network, gateway, and model service layers. This design is intended to provide failover and recovery under abnormal conditions and reduce the impact of interruptions on production workloads. A dashboard provides an overview, spend trend, call distribution, and call ranking, giving teams visibility into usage and cost. The model catalog includes curated models across categories, such as MiniMax Image-01 and xAI Grok Imagine Image 2.0, with image models billed per call or per image. Typical use cases include teams that need to integrate multiple AI providers, switch or scale models without duplicating development work, and run production workloads that require high availability. The workflow involves creating an account, adding funds to the prepaid wallet, configuring the RouteMux base URL and API key in a compatible client, and sending requests through the gateway. Developers can call the OpenAI-compatible endpoint from Python using standard OpenAI client libraries by setting the base URL and API key. Usage and billing are tracked in one account and one invoice.