The independent metering and rating engine for usage-based pricing. Per-event pricing, an Apache-2.0 open core, and credit primitives built for the AI era — the calculation layer that never touches your funds.
POST /v1/events with an idempotency_key — duplicates are deduplicated before counting, so retries never double-bill.
Define meters with sum / max / last aggregation and attach tiered price tables. One billable unit per customer-defined meter.
Invoice preview any time: rated lines with quantities, unit prices, and totals — before anything is charged anywhere.
Credit wallets with burndown on finalize. Arm a hard stop and event ingest returns 402 the moment the balance hits zero — machines can't overspend.
Push rated lines to real Stripe invoice items against your customer's Stripe customer id — or take a dry-run payload for your own flow. Adyen and manual-export seams included.
Per-tenant API keys stored as SHA-256 hashes. SQLAlchemy 2.0 over Postgres in production, SQLite for dev. Interactive docs at /docs.
