[Update] The Addons API services are up. We have identified the issue and have done some progress so Shops' back offices should now be available with short lags. We will also work on the API to handle more and more requests in the short future.
— PrestaShop (@PrestaShop) October 2, 2018
https://goo.gl/EO0ad1
https://goo.gl/xF8heB