Orb

Usage-based billing infrastructure designed for flexible pricing and hybrid subscription models. Stores usage events immutably and calculates bills by querying event history at billing time, rather than real-time aggregation, which enables late data handling, backfills, and automatic invoice recalculation without manual reconciliation.

Trusted by Vercel, Supabase, Replit, Stytch, LaunchDarkly, and Pinecone. Purpose-built for usage-based pricing unlike platforms that added metering as an afterthought: the query-based architecture supports custom SQL metrics, backdated amendments, and handling 1M+ billing events per second through hosted rollups. Offers SDKs for Python, Node, Ruby, and Go with migration guides from Stripe Billing, Metronome, and Chargebee.

Key capabilities:

• Simulations to test pricing changes against historical usage before deploying
• Backfills and automatic invoice recalculation when late or corrected data arrives
• Custom SQL metrics for complex billing logic over raw event data
• Hosted rollups for high-throughput event ingestion at scale
• Real-time usage visibility, forecasting, and usage alerting for product-led growth
• Revenue recognition with exports for accounting systems

Common use cases: infrastructure and AI companies billing for API calls, compute, or tokens; B2B SaaS combining seats with usage overages; enterprise contracts with prepaid credits, shared credit pools, and backdated amendments. Developers integrate via events API and SDKs to define metrics, create subscriptions, and sync with data warehouses such as Snowflake and Redshift.