> ## Documentation Index
> Fetch the complete documentation index at: https://docs.routerlink.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> Unified LLM gateway — one API key, every model, transparent billing.

# About us

[**RouterLink**](https://routerlink.ai/) is a one-stop large-scale model access network provided by WORLD3.

Developers only need one API key to call all mainstream AI models through a unified WORLD3 endpoint, including:

* OpenAI Channel (GPT series)
* Anthropic Channel (Claude series)
* GCP Vertex (Gemini series)
* World3 Router Asia Pacific
* World3 Router North America
* And more models

RouterLink automatically implements:

* Unified Interface Format
* Automatic routing to the target provider
* Multi-model invocation and transparent billing
* Token-level Credits Tracking
* Secure API Key Management

RouterLink supports two protocol interface formats:

* Models accessed via the OpenAI-compatible API
* Models accessed via the Anthropic API

On the client side, your application only needs to communicate with RouterLink, instead of managing integrations with multiple vendor APIs.