You can browse the early access documentation for the new Answer Bot API at https://developer.zendesk.com/rest_api/docs/answer-bot-api/.
The Answer Bot API returns Help Center article suggestions based on a specific question from a user. Answer Bot uses machine learning to return articles that might answer the user's question.
The API also lets you give feedback to Answer Bot about the usefulness of the suggested articles to help it improve its suggestions.
The Answer Bot API is currently in early access. To learn more about the early access program (EAP) and provide your feedback, see the Zendesk Guide EAP - Answer Bot APIs in the Support community.