The new Content Delivery API, powered by GraphQL, is online at last! You can now use DatoCMS to create public-facing apps of any kind!
The old REST API has been renamed Content Management API
The new Content Delivery API, which during beta period lived under https://site-api.datocms.com/graphql, has been moved to a separate domain (https://graphql.datocms.com). This change will enable performance optimizations in the very near future.
Here's the official announcement blog post.