The new URL for the REST API endpoints contain the prefix as well as a namespace like this:

If you don’t like the default base prefix and want to change it from wp-json to something more beautiful, the code snippet will help you to change the base prefix from wp-json to api.

As soon as you are done adding the above snippet, you have to flush rewrite rules by resaving permalinks from Settings > Permalinks to access all the data from your new api like this:

Want to learn about WP REST API? You can read the handbook here.