Flexprice: The Next-Gen Pricing Engine Built for Developers

What Is Flexprice?

Flexprice is an open-source billing platform designed specifically for developers. It supports usage-based billing, credit-based billing, and hybrid pricing models. The platform offers a comprehensive solution covering usage metering, pricing strategies, subscription management, and invoicing—enabling teams to focus on building products instead of custom billing systems.

Key Features

1. Usage Metering

Flexprice allows users to define granular usage events—such as API calls, compute time, or custom operations—and reliably tracks and aggregates usage data in real time, even under high load.

2. Flexible Pricing Plans

Supports seat-based, usage-based, or hybrid billing models. Users can create custom plans, override pricing by customer, and adapt pricing over time without additional engineering overhead.

3. Feature Management

Define boolean, metered, and configuration-based features per plan and per customer. Enforce limits directly in the backend, manage access based on usage, and control feature availability without building complex logic.

4. Subscription & Invoicing

Generate accurate invoices from real-time usage, subscriptions, or credits. Flexprice gives finance teams clear reconciliation tools and provides customers with full visibility into what they’re being charged for.

5. Credit Management

Grant prepaid or promotional credits, set auto-recharge thresholds, and manage credit expiration with full control. Flexprice enables businesses to tailor credit workflows to their needs with no extra logic required.

How It Works

Flexprice’s architecture is composed of several core services designed to ensure efficient and reliable billing operations:

• API Service: Handles all HTTP requests, authentication, and authorization. It writes data to PostgreSQL and publishes events to Kafka for asynchronous processing.

• Worker Service: Consumes messages from Kafka for async processing and writes aggregated data to ClickHouse for analysis and reporting.

• Temporal Worker: Executes scheduled tasks and long-running workflows like billing cycles, task orchestration, and webhook delivery.

Flexprice also provides modular building blocks—including usage metering, pricing layers, billing and subscription engines, and feature/permission layers—that can be used independently or in combination as needed.

Project Links

• Website: https://flexprice.io/

• GitHub Repo: https://github.com/flexprice/flexprice

Use Cases

Flexprice is ideal for a wide range of scenarios that require flexible billing solutions:

• SaaS Products: Subscription-based billing with support for trial periods, feature gating, and multi-currency pricing.

• AI Service Providers: Usage-based billing for metrics like API calls or GPU time, ensuring transparency and precision.

• API Platforms: Automatically generate invoices based on real-time API usage, supporting high-frequency access and complex pricing schemes.

• Global Businesses: Support for multi-currency billing and regional pricing to serve diverse markets effectively.