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

# Fractal REST API Reference: Traces and Authentication

> Explore the Fractal REST API: ingest OpenTelemetry traces, authenticate requests, and integrate directly with the Fractal platform.

The Belvedir REST API accepts OpenTelemetry trace data in OTLP JSON format. The SDK calls it automatically — you rarely need to hit it directly.

* **Base URL** — `https://platform.belvedir.ai`
* **Authentication** — API key via `Authorization: Bearer` or `x-api-key` header. See [Authentication](/api-reference/authentication).
* **Endpoints** — [`POST /api/v1/traces`](/api-reference/traces).