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

# API reference overview

> Interactive reference for BuildingSwell v2 API endpoints.

This section provides interactive endpoint documentation generated from the OpenAPI specification.

## Authentication

All endpoints require the `X-API-Key` header. Set your key in the playground to try requests.

## Base URL

```
https://app.buildingswell.com/api/v2
```

## Standard CRUD

Most resources follow the same endpoint pattern documented in [standard endpoints](/guides/standard-endpoints). This reference lists the concrete paths for each resource group.

For querying, filtering, and joins, see the [querying guide](/guides/querying).