I once followed their docs and added it to my Claud Code Web to call their API. Unbeknownst to me they started charging me for all Claude Code calls by passing them to the API. They refused to refund me, but did update their docs at some point to remove the faulty instructions I followed.

> Unbeknownst to me

Isn't that literally what the point of this environment variable is for?

ie to provide your Anthropic API key to Claude Code so it uses that for billing