# API Base URL

The API Base URL is a unique URL for each [CARTO deployment region](https://docs.carto.com/carto-user-manual/overview/carto-cloud-regions) or [Self-Hosted](https://github.com/CartoDB/gitbook-documentation/blob/master/carto-user-manual/developers/managing-credentials/broken-reference/README.md) tenant. You should use this unique URL in all your API calls, or the authentication process will fail.

For example, the CARTO Cloud US region uses `https://gcp-us-east1.api.carto.com` while a Self-Hosted deployment will probably use something like `https://your-carto-tenant-domain.com/api`

You can use this section to copy the API Base URL.

<figure><img src="https://3029946802-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FybPdpmLltPkzGFvz7m8A%2Fuploads%2Fgit-blob-e973e324e6526373b05bf20ede1f0693dd535fe5%2FScreenshot%202024-04-29%20at%2011.22.48.png?alt=media" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
To learn more about how to use CARTO APIs, check the [API reference](https://docs.carto.com/carto-for-developers/key-concepts/apis).
{% endhint %}