Currently, Workers KV Request Analytics [1] only supports Cloudflare’s Api Key auth. Using Api Keys is dangerous since keys have global read/write access to the account. Api Tokens can be scoped, and have been supported in other Cloudflare endpoints for some time [2].
This account-level read-only analytics endpoint should support Api Token auth, especially since there is now is an Account-level “Account Analytics” token permission that would map perfectly to this use case.
[1] Cloudflare API v4 Documentation
[2] Announcing the General Availability of API Tokens