We have identified the source of the issue and have taken steps to correct it. As of 8:42AM MT, we are seeing improvement in the status of the systems. Login, API calls and navigating to app.sendgrid.com are no longer showing errors. You may need to clear your cache in order to login to the website. You can contact our Support team at https://support.sendgrid.com
with any questions. We apologize for any inconvenience.