Your API requests are authenticated using API keys. Any request that doesn't include an API key will return an error.
You can ask your account manager to create an API key for you.
The production domain for the HIVE API is https://app.hive.app/, the staging domain is https://staging.app.hive.app/
The API uses JSON extensively. It only accepts requests where the body is valid JSON (so you need to set the header content-type: application/json in your requests). It's easier to interact with it using a REST client. Some options are:
for VS code
for the command line