Back in the day, there used to be Authentication Tokens that you could use when using the API to associate your account with the upload/paste/url. With the change to our authentication system, those dissapeared.
Now I am pleased to announce that they are back! You can visit your Auth Tokens Settings to generate a token. This can be used to access the API instead of OAuth as a simple header Authentication token. You can view more about it on the API Help Page.