Building the gateway for the multi-model AI era

The AI ecosystem fractured. In 2023 a developer needed one SDK and one API key. By 2026 every meaningful product touches four to ten models — a frontier reasoning model, a fast cheap chat model, an image generator, a transcription pipeline, an embedding model for retrieval, a code model for tool use, and maybe a robotics policy for an embodied agent. Each one ships behind its own SDK, its own auth flow, its own quirks of streaming, its own billing console, its own region map. The cost of stitching them together is now larger than the cost of the inference itself.

Railwail collapses that surface. We expose one OpenAI-compatible endpoint and route requests behind the scenes to whichever provider hosts the model you asked for. The SDK you already know keeps working — change the base URL and the key and inherit access to the whole catalog. Your billing collapses into one prepaid balance in USD. Your provider accounts collapse into one account with a company based in Germany. Your monitoring collapses into one dashboard.

We exist because every developer who tried to build seriously on top of LLMs in the past eighteen months has felt the friction of this fragmentation. We are not optimising for marketplace breadth for its own sake. Every model page states its price per unit and whether the model can currently be run, so you know before you integrate it. The catalog is the product, and keeping it honest is part of the job.