Flexprice

Flexprice is monetization infrastructure for AI-native and SaaS teams that need usage-based, credit-based, seat-based, or hybrid billing. Applications send usage events from backend APIs, AI agents, custom workflows, or data pipelines, and Flexprice meters usage and applies pricing rules in real time.

It supports custom usage events, prepaid and promotional credits with auto top-ups and expiry, customer-specific plan overrides, plan versioning, feature entitlements, usage limits, and invoice generation. It exposes Go, Python, and JavaScript SDKs plus webhooks, can sync to payment, CPQ, CRM, and accounting tools, and builds on top of providers such as Stripe or Chargebee.

The core is open source under AGPL-3.0 and runs self-hosted via Docker Compose over PostgreSQL, Kafka, ClickHouse, and Temporal, with a hosted cloud also available. A small Enterprise Edition is offered under a separate commercial license.