RouteMux is a reliability-first AI gateway that puts hundreds of AI models behind one OpenAI-compatible API and one key. Route text, image and video workloads to models from OpenAI, Anthropic, Google, xAI, DeepSeek, Qwen, MiniMax, Moonshot, Meta and more through the SDK you already use — only the base URL changes — and requests fail over across redundant routes when a provider stumbles. Billing is usage-based and pay-as-you-go with no subscription and no seats: you top up a wallet, only successful requests are billed, failed calls and timeouts cost nothing, and any unused balance can be withdrawn or refunded at any time. Named vendor routes come with stated SLAs instead of opaque resale, pricing is shown per token and per call, and one console holds keys, quotas, usage and logs. A first top-up bonus adds 10% extra credits for top-ups of $20 or more within 72 hours of signing up. It suits developers and teams shipping production AI features who want one integration for many models, automatic failover and transparent, refundable billing instead of managing a separate account per provider.