Chargebee
Subscription billing and revenue management for recurring businesses
Open-Source Projects
Discover top open-source software, updated regularly with real-world adoption signals.
Discover top open-source software, updated regularly with real-world adoption signals.
Usage-based metering and billing infrastructure for developers
Open-source billing platform for usage-based, credit-based, and hybrid pricing models. Handles metering, pricing, and invoicing with full developer control and composable architecture.
Flexprice is an open-source metering and billing platform designed for engineering teams building usage-based, credit-based, or hybrid pricing models. Instead of wrestling with rigid billing tools or building custom infrastructure from scratch, developers can instrument their applications with simple SDKs and let Flexprice handle real-time usage aggregation, pricing calculations, credit management, and invoice generation.
Built with a composable design, Flexprice integrates seamlessly with existing payment processors (Stripe, Chargebee), CRMs, CPQ systems, and accounting tools. Stream usage data from backend APIs, AI agents, data warehouses, or analytics pipelines—Flexprice processes events in real time, applies customer-specific pricing rules, enforces feature limits, and syncs billing information across your stack. Because it's open-source and self-hostable, teams gain full transparency and control without vendor lock-in or percentage-based fees.
Whether you need pure pay-as-you-go, tiered subscriptions, prepaid credit bundles, promotional credits, or complex hybrids, Flexprice's data model and rules engine adapt without schema migrations or custom code. Define granular usage events, manage feature entitlements per plan, and iterate on pricing strategies in minutes—not months. Engineering teams reclaim time for core product development while finance and operations gain clear visibility into usage and revenue.
When teams consider Flexprice, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
API Platform with Tiered Usage Pricing
Track millions of API calls in real time, apply tiered volume pricing per customer plan, and generate accurate invoices without custom metering code.
AI Agent Platform with Prepaid Credits
Grant customers prepaid credit bundles, automatically deduct usage costs, trigger top-ups at thresholds, and expire unused credits—all managed by Flexprice.
SaaS Product with Hybrid Seat and Usage Model
Combine seat-based subscriptions with usage-based overages, enforce feature limits per plan, and iterate pricing strategies without schema migrations.
Data Warehouse Billing Integration
Stream usage events directly from data pipelines, aggregate compute or storage consumption, and sync invoices to existing payment processors and accounting tools.
No, Flexprice is designed to work alongside payment processors like Stripe or Chargebee. It handles usage metering, pricing logic, credits, and entitlements, then syncs invoices and billing data to your existing payment and accounting systems.
Yes, Flexprice is open-source and self-hostable, giving you full control over your billing data and logic without vendor lock-in or percentage-based fees.
Flexprice supports usage-based, seat-based, tiered, prepaid credit, promotional credit, and hybrid pricing models. You can configure and iterate on pricing strategies without custom code or schema changes.
Flexprice is built to meter and aggregate millions of events in real time with reliable processing at scale, ensuring accurate billing even during peak load.
No, Flexprice has a composable architecture that integrates with your current payment gateways, CRMs, CPQ, and accounting tools, preserving existing workflows while adding advanced metering and pricing capabilities.
Project at a glance
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