The same per-minute axis with the opposite disclosure posture. Retell publishes a full itemised rate card, $0.055/min voice infrastructure, $0.015/min telephony and a per-model LLM line, so the bill is calculable before contact. PolyAI publishes the unit and withholds the rate.
The closest like-for-like on buyer and posture: an enterprise voice agent sold into contact centres through a demo request rather than a price.
Also publishes no rate, but bills a resolved outcome rather than elapsed time. The choice between them is which exposure you prefer: a disputed definition of resolved, or minutes that bill whether or not the call worked.
Developer-first voice infrastructure with a published per-minute platform fee. A different buyer, and the counterexample to the claim that per-minute voice pricing cannot be published.
7 of 9 not published by PolyAI, checked