# Authentication and connections

Choose the connection for the API you are using.

## Fleets and Infrastructure

The Fleets and Infrastructure APIs use `https://app.mk.io/` and bearer authentication:

```http
Authorization: Bearer <YOUR_TOKEN>
```

Follow [Create a personal token](/mkio/api-guides/getting-started/authentication#create-a-personal-token) to obtain a token. Replace `<YOUR_TOKEN>` with that token and use a project that your account can access. Keep the token out of source control.

## Channels

The Channels API is served by the Beam device. Follow [Connect to a Beam device](/beam/api-guides/how-to/channels/connect-to-a-device) for the device address and supported versions, and consult the [Channels API reference](/api-reference/channels-api) for the operation you need.

## Verify cloud access

[Your first API call](/beam/api-guides/getting-started/first-api-call) lists devices through the Fleets API.