If you lost or not sure if you had API key for WordPress or Akismet, following is the way to get one.
- Go to http://apikey.wordpress.com/ . If you are logged on you will see it. If not you should log in to your WordPress.com account. WordPress.org guys, you may not remember but once you got your API key you signed up for a WordPress.com account.
- The API key for WordPress.com stats and Akismet is the same. You can ask Akismet to resend it to you at https://akismet.com/resend/ . You can always apply for a new Akismet key if needed.
- If you wish to know more about the API key you can read http://wordpress.com/api-keys/