---
title: "Authentication"
description: "Authenticate your integration and make your first Core API request."
lastModified: "2026-08-21"
---

Use the base URL supplied by Brella. The examples use:

```
https://api.brella.io
```

Sandbox environments use their corresponding sandbox hostname.

Every request should send these headers:

```
Accept: application/vnd.brella.v4+json
Brella-API-Access-Token: YOUR_TOKEN
Content-Type: application/json
```

Minimal read example:

```shell
curl --request GET \
  --url "https://api.brella.io/api/core/organizations/30/events/319986/leads" \
  --header "Accept: application/vnd.brella.v4+json" \
  --header "Brella-API-Access-Token: YOUR_TOKEN"
```

`Brella-API-Access-Token` authenticates Core API integrations.