Source: https://databento.com/docs/api-historical/basics/authentication


### Authentication

Databento uses API keys to authenticate requests. You can view and manage
your keys on the [API keys]($PLATFORM_HOSTNAME/portal/keys) page of your portal.

Each API key is a 32-character string starting with `db-`. By default, our library uses the
environment variable `DATABENTO_API_KEY` as your API key. However, if you
pass an API key to the `Historical` constructor through the `key` parameter,
then this value will be used instead.

Related: [Securing your API keys](https://databento.com/docs/portal/api-keys.md#securing-your-api-keys).

#### Example usage

```python
import databento as db

# Establish connection and authenticate
client = db.Historical("$YOUR_API_KEY")

# Authenticated request
print(client.metadata.list_datasets())
```