API Keys are used for authenticating, identifying requests and applying rate limiting to the requests.
Each user has an account based "request per minute" capacity, which limits the number of monitor data that can be sent in a minute, and this capacity is shared by API Keys.
CREATE API KEY button to set request limit per minute and determine an alias for you key. This alias will help you to remember that key easily.
An API Key can be “disabled” by setting it’s RPM to 0, or can be deleted optionally.
So each API key has its own "request limit per minute" capacity and sum of these capacities cannot be exceed account based capacity. The default RPM capacity is currently set to
You can divide that capacity for each API Key as much as you want.
Also you can observe api key usages from