accounts don't exist yet
On purpose. The library and the free hosted tier need no account, no key, and no signup — that's the product working as designed.
Accounts will arrive with the paid tier: an API key, billing, and usage you can see. Until something costs money, asking you to log in would only be collecting emails — and we don't want them.
If you want to know when the paid tier opens, watch the repo — releases are announced there first.