You need to be a Bulk Customer in order to get an API key.
Where can I find my API settings?
To find your API settings, please follow these steps:
How Can I use key api ? I don't known Use . my first time .
Our API, or application program interface, provides you with the tools to build and use your own software and servers to search for domains, register domains, and more. You can check more information from this page: https://www.dynadot.com/domain/api.html