Hi,
If your question was referring to the Denodo API Service, I would follow the steps mentioned in the community Q&A [How to publish the derived view as API (denodo.com)](https://community.denodo.com/answers/question/details?questionId=9060g000000TRNOAA4&title=How+to+publish+the+derived+view+as+API).
If your question was referring to establish connections to API sources, I would follow the steps mentioned in the community[ Q&A
How to access the RestFul API from Denodo?](https://community.denodo.com/answers/question/details?questionId=90670000000blKbAAI&title=How+to+access+the+RestFul+API+from+Denodo%3F).
I would also refer to user manuals [RESTful Architecture](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/restful_architecture/restful_architecture#restful-architecture) and [Publication of Web Services](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/publication_of_web_services/publication_of_web_services#publication-of-web-services).
And for performance and troubleshooting needs, I would refer to these denodo articles [Optimizing Queries](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/optimizing_queries/optimizing_queries#optimizing-queries) and [denodo monitor](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/monitoring_the_virtual_dataport_server/denodo_monitor/denodo_monitor).
Hope this helps!
