Mode:Simulation · Gemini API bypassed · Arc tx refs real
P402 Meter·Arc TestnetDemo

Real-time AI billing
for payer operations

Each AI step is priced in USDC and settled on Arc.

Gemini handles document intake and review.

The ledger stays visible from start to finish.

55+ Arc transactions per run$0.006 per settlementGemini multimodal intake
Run Demo →AboutDocs ↗ArcScan ↗
One-Click DemoSafe mode · Gemini bypassed
What this provesAI compute can be metered, priced, and settled at token granularity — making per-action billing economically viable for the first time.
De-identifiedNo PHIAdmin Only
Budget Spent$0.000000
Remaining$0.5000
AI EventsNot started
Arc TxNot started
Avg / EventNot started
ProofREADY
READY
SessionNot started
Budget
$0.0000 / $0.50
Arc Settlement Proof · Hackathon Criteria
AI Events
—
Not started yet
Signed Auths
—
Not started yet
Arc Tx
—
Not started yet
Avg / Event
—
Not started yet
50+ Threshold
—
requirement
Circle + Arc Infrastructureload-bearing components
Circle DCW
Session Wallet
Developer-Controlled Wallet provisioned on ARC-TESTNET per session. No user custody required.
Nanopayments
Sub-Cent Settlement
Circle Nanopayments API authorizes each USDC micro-event. One authorization per AI billing chunk.
Circle Gateway
x402 Verification
Gateway domain 26 on Arc testnet. Verifies x402 payment headers at gateway-api-testnet.circle.com.
Arc Testnet
Chain Settlement
USDC as native gas. Chain ID 5042002. USDC predeploy 0x36000…. Settlement at $0.006/tx.
Arc Hackathon · April 2026 · Usage-Based Compute Billing · Gemini Prize Track
01Document Intake
Prior Auth · Gemini Multimodal
De-identified · Administrative only · No PHI
Approval required
Demo Packets
02Gemini Extraction

Upload a packet or load the demo packet.

Gemini will extract payer, procedure, urgency level, and review flags here.

03UM Review Summary
Waiting for work order

Start the review to see the payer-ops summary.

Gemini will produce a utilization management summary with rationale, policy reference, and recommendation.

No work order
04Economic Ledger
$0.000000

Each billed AI event will appear here in order.

Running cost and Arc settlement proof are shown per event. Start a review to begin.

Budget Cap$0.50
Session
—
Total Cost
—
AI Events
—
Arc Tx
—
06Governed Outcome
Awaiting Review Completion
⚡Why Arc works for per-step AI billing
Usage-Based Compute Billing
Ethereum
$2.85

Settlement cost exceeds the AI work itself. Real-time per-token billing is structurally impossible.

Stripe
$0.30 min

Minimum fee forces batching 300+ sub-cent actions. Real-time pricing is eliminated.

Arc
$0.006

Sub-cent settlement preserves real-time pricing. Every token chunk settles individually.

NetworkSettlement costAI costTotal / actionViable
Ethereum Mainnet (30 gwei)~$2.85~$0.0003~$2.85✗
Stripe (2.9% + $0.30 min)$0.30 min~$0.0003~$0.30+✗
Base L2 (typical)~$0.02~$0.0003~$0.020✗
Arc Testnet (USDC gas)$0.006 USDC~$0.0003~$0.0063✓

Arc is the first rail in this demo where settlement stays below the value of the individual AI action.ETH gas at 30 gwei, 65k gas per ERC-20 transfer. Numbers from live Arc testnet runs.

Circle Infrastructure
Circle Developer-Controlled Wallets provision per-session spending accounts on ARC-TESTNET. Circle Nanopayments handles sub-cent settlement. Circle Gateway domain 26 verifies x402 payments on Arc.
Inherited P402 Trust Depth
Trust Center ↗
✓ERC-8004 Identity
✓Reputation-Aware Routing
✓AP2 Budget Controls
✓Evidence Bundle Ready
✓Replay Protection
✓Non-Custodial Execution