Invoice-based (meter now, bill later)
Metronome · Orb · Lago · Stripe Meters
Four layers from models to business decisions — and where the opportunity is.
Invoice-based (meter now, bill later)
Metronome · Orb · Lago · Stripe Meters
Real-time (authorize → debit → allow/deny)
FluxMeter Pillar A — check, reserve, kill
Observability (what ran?)
Langfuse · Helicone · LangSmith
Decision (why margin? what next?)
FluxMeter Pillar B — intelligence
FluxMeter owns Layer 3 execution (meter, check, reserve, kill, export) and Layer 4 decision (root cause, unit economics, simulation, pricing intelligence). Observability and invoice platforms stay complementary — overlay ingest, not replace.