Recurly specializes in subscription management and recurring billing. It offers a range of services including plans, pricing and promotions management, subscriber management, payments orchestration, recurring billing, churn management, and reporting and analytics, primarily serving sectors such as streaming media, digital publishing, eLearning, SaaS, consumer goods and retail, business services, health and wellness, travel, hospitality and entertainment, telecom, energy and utilities, government and non-profit. The company was founded in 2009 and is based in San Francisco, California.

Aria Systems focuses on cloud-based billing infrastructure. The company offers a platform to simplify billing processes, allowing businesses to launch and adapt their offerings. This platform handles complex usage and subscription business models across various industries. It was founded in 2003 and is based in San Francisco, California.

Stripe operates as a technology company that specializes in online payment processing and financial infrastructure for Internet businesses. The company provides a suite of products that enable businesses to accept payments, manage billing and subscriptions, handle in-person transactions, and integrate various financial services into their operations. Its platform is designed to support startups, enterprises, and everything in between with scalable, API-driven solutions. Stripe was formerly known as DevPayments. It was founded in 2010 and is based in South San Francisco, California.

Sticky.io focuses on e-commerce growth, specifically in the domain of subscription management and recurring billing. The company offers a performance-driven platform that provides order management and billing tools, including product management, cart and checkout services, payments, subscription management, recurring billing, churn management, fraud prevention, and data analytics. Sticky.io primarily serves the ecommerce industry. It was formerly known as LimeLight CRM. It was founded in 2008 and is based in San Francisco, California.

Logisense is a company that specializes in usage-based billing solutions, operating within the technology and software industry. The company offers a range of services including usage-based, hybrid, and subscription billing, as well as integrations with other technologies, analytics and reporting, and solutions for contract commitments, payments and collections, and audit, tax, and compliance. Logisense primarily serves the communications, IoT, connected services, and SaaS sectors. The firm was founded in 1998 and is based in Cambridge, Ontario.

Paddle is a comprehensive payments, tax, and subscription management platform. The company offers a merchant-of-record solution that handles payments, tax compliance, subscription billing, and fraud protection to facilitate global sales for software businesses. Paddle's services are tailored to meet the needs of both business-to-business (B2B) and business-to-consumer (B2C) software companies, aiming to simplify and automate their billing operations to focus on growth. It was founded in 2012 and is based in London, United Kingdom.