> ## Documentation Index
> Fetch the complete documentation index at: https://docs.haau3.com/llms.txt
> Use this file to discover all available pages before exploring further.

# haau3 Platform

> Healthcare APIs built for speed and clinical accuracy.

The **haau3 Platform** is a set of healthcare APIs served from `https://api.haau3.com`. Each
service is a product you can build on. Scheduling is available today, with more services
planned.

## Two layers of interoperability

Modern FHIR APIs solve syntactic interoperability: data shaped to a shared standard so
systems can exchange it. That is necessary, but well-formed data can still lose meaning
along the way. The haau3 Platform works on the semantic layer too. It preserves clinical
meaning as data moves between systems and enriches it where that adds clarity, so what you
receive is correct in structure and faithful in meaning.

The APIs are engineered to be fast and quick to integrate, and the clinical content behind
them is carefully vetted.

## Start building

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Get a key and make your first authenticated call.
  </Card>

  <Card title="Authentication" icon="key" href="/authentication">
    How API keys work and the 401 contract.
  </Card>

  <Card title="SMART Scheduling Links" icon="calendar" href="/scheduling/smart-scheduling-links">
    How the Scheduling service aggregates provider availability.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference">
    Interactive reference for every endpoint, generated from our contracts.
  </Card>
</CardGroup>