NanoMeter. Margin Intelligence Layer.

**The problem.** Circle Nanopayments solved settlement for sub-cent agentic commerce gas-free, batched, sub-second. But because settlements are aggregated and delayed, developers can no longer see per-call profit. NanoMeter is the observability layer that closes that gap. **What it does.** A one-line Express middleware (`app.use(nanometer())`) that wraps Circle's `@circle-fin/x402-batching` middleware and emits a structured per-call event for every paid request. Powers a real-time dashboard with four views: Live (calls/sec, revenue, tx feed), Margin (counterfactual cost on Ethereum / Base / Arc, side by side), Cohorts (per-agent LTV with z-score anomaly detection on cost-per-success), Settlement (onchain batch events linked to the Arc explorer). **The math.** At $0.001/call: Ethereum mainnet gives −14,900% margin (gas $0.15/tx). Base L2 gives −1,400%. Arc + Nanopayments: +94%. This is not an optimization, it is the only solution to the inequality. **Requirements.** - Per-action pricing: $0.001 (1/10th of the $0.01 cap) - 50+ on-chain transactions: 200+ paid requests over a 90-second swarm run, all settling on Arc testnet via Circle Gateway - Margin explanation: built into the product itself, the Margin tab IS the proof **Tracks.** Per-API Monetization Engine (primary) + Real-Time Treasury / Ops (secondary). **The stack.** AIsa is the capability platform. Models, skills, payment rails, 25%+ of x402 volume. MCPay/AgenticTrade/OmniAgentPay are agents that pay. NanoMeter is the instrument every one of those projects needs. **Built by solo dev/data engineer working in Fintech** Compatible with AIsa endpoints out of the box, point `nanometer()` at any Nanopayments-monetized API and observe margin without code changes on the seller side.