Get the authenticated API key + workspace

Returns the API key and workspace that the Bearer token belongs to, including the key's granted scopes, plus the account's current standing. Useful for verifying a key, discovering its permissions, and checking whether the account can send before you attempt any write. The billing block is present only when the account is suspended over an outstanding invoice. This is the one endpoint whose response is NOT wrapped in the standard data envelope.

No scope required — any valid API key works.