If you want to subscribe to this plan, then you need to sign in/up
Plan, you want to subscribe will coasts you $0.0 per month and charge will be now. Further charges will occur every month automatically.
You can manage your subscription from this page and from the "API Subscriptions" section in your account.
If you want to unsubscribe from this plan, you can do it now, and your API keys will became invalid instantly;
or you can unsubscribe on next payment date and your API keys will run for the rest of month.