Lago

Lago is an open-source, API-first billing solution designed for product-led SaaS companies. It supports usage-based and subscription-based pricing models, offering features like metering, invoicing, and coupon management. It aims to provide a flexible and composable billing infrastructure that integrates with existing payment gateways and other internal systems.

Lago is an open-source metering and usage-based billing API. It explicitly states it is an alternative to Stripe Billing and offers features like usage metering, price plans, coupons, add-ons, and invoicing. It also highlights its programmable API for integration, aligning with the developer-first aspect of the concept. While it doesn't directly handle payment processing itself, it mentions 'Payment orchestration' and is designed to connect to 'any payment gateway', implying its role in the overall payment flow.