Free AI Gateway
API documentation
An OpenAI-compatible gateway across free-tier providers. Start with/docs/getting-startedor jump directly to an API reference below.
Getting started
Connect an OpenAI-compatible client to the gateway.
Chat completions
Generate text with streaming, tools, JSON mode, and vision.
Responses API
Use the OpenAI Responses format through the gateway.
Decision APIs
Answer typed questions and compare engines on one frozen input.
Models
Browse routing capabilities and available model families.
Authentication
Authenticate protected requests with a gateway key.