tools and tool_calls fields. Holo-specific behavior (reasoning, structured outputs, and the coordinate convention) comes through a few extra fields documented here.
Endpoints
POST /chat/completions
The inference endpoint: parameters, response fields, streaming.
GET /v1/models
Discover served models, limits, pricing, and deprecation dates at runtime.
Endpoint and auth
The Quickstart shows the client setup in Python, TypeScript, and cURL. Model IDs, per-model limits, pricing, and tiers live on the Models page.
The two response channels
Every call returnsmessage.content (the action or answer) and message.reasoning (the thinking trace, read-only). Field-by-field details are in the chat completions reference. Core concepts covers how to carry state across turns.
Conventions
Coordinates in[0, 1000], the 3-screenshot image budget, choosing between structured outputs and function calling, and passing Holo-specific fields through the OpenAI SDKs are covered in Core concepts.
Rate limits
The credit dashboard (the Inference credits tab) shows your balance and usage. The balance is checked before a request runs, so a large request on a low balance can overshoot by a few cents. Contact support@hcompany.ai if it keeps growing. Unused credits may expire one year after purchase and are not refundable by default, subject to regional obligations and the terms of use.