Orbio is an AI inference credit marketplace on the Robinhood Chain. Users can call over 400 models, including Claude Fable, GPT Astra, and Gemini, through an API compatible with OpenAI, with requests directly reaching the selected model and suggestions not being stored in the database. Staking ORBIO generates CREDIT, with 1 CREDIT corresponding to $1 of inference credit. CREDIT can be held, transferred, traded in the on-chain order book, or activated and burned, crediting to the API balance. Agents can also directly purchase CREDIT without staking.