💳✨ Add usage-based credits to your Rails app

Stripe-native usage metering with real-time cost projections, exactly-once processing, and invoice parity guarantees.

Miro app with usage-based billing using Salable in Next.js

Quote-as-ceiling billing for AI agent APIs that charge by the step - pre-estimate cost, enforce it as a hard ceiling, absorb overruns. Three CI-enforced invariants, ASC 606 compliant, production-extracted.

Multi-tenant usage billing control plane with direct Stripe integration — pricing catalog, invoicing, payments, dunning, and operator tooling.