I see what you mean. Anthropic's UI and system organization are always very confusing.

Your link and my link are just two views into the same underlying account (unless you registered separate accounts of course). At your link, you can manage your Claude subscription. At my link, you can manage API keys and API credits.

But they aren't siloed like you (or I) think.

I got Claude Code when it launched and it always charged API credits until it was included in the $100 max subscription (and then in the cheap base subscription). It moves fast and it's not well communicated.