P402 Meter is the first system to price AI computation at the token level and settle each event in USDC on Arc in real time. Prior authorization review in healthcare is the proof — a document-heavy, high-stakes workflow where every reasoning step has measurable value and every cent of cost can be governed, attributed, and audited.
P402 Meter instruments the Gemini generation stream at the chunk level. Each text chunk emitted by the model triggers a ledger event: tokens estimated, cost calculated at $0.0000006/token, USDC amount recorded, event written to Arc. A single prior authorization review generates 55+ onchain events. Total cost: under $0.01.
Upload a prior-auth document → Gemini reads it, classifies it, reviews it → every token of that thinking settles in USDC on Arc → Gemini Pro audits the economics → humans approve the recommendation with full proof of work.
Most hackathon demos use simple e-commerce or generic chat flows to prove a payment concept. Prior authorization review is the opposite — it is document-heavy, policy-bound, multi-step, explainability-critical, and economically significant. If per-token billing works here, it works everywhere.
Load the demo packet. Watch Gemini extract it. Hit Execute Review. Watch 55+ economic events appear in real time. See the total cost land under $0.01. Then look at the margin panel and ask whether any other payment rail could do this.