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Accounts can now be claimed with the coming 'Account Creator' tool. The number of claimed accounts is being displayed there too, but creating accounts is not possible yet:

Ah, this is what I was looking for! So after claiming an account... nothing happens! Do I then need to use another tool to create the account? The Create Claimed Account will remain greyed out for now, is that right?
Many thanks, great features.

Yes, that's right, there are two steps involved. Creating the account is the second step and I've not implemented this yet. The claimed accounts can later be used to create accounts without any costs. I hope it will be ready in the coming week.

Awesome! Thanks!