Billing Startups funded by Y Combinator (YC) 2026

Drip is the operating system for enterprise contract operations. We unify communication, procurement, pricing, entitlements, and financial workflows into a single context layer so companies can execute deals, coordinate internally, and manage contracts without engineering bottlenecks.

We unify your contracts, service consumption, and customer relationship context so that your revenue, success and sales teams can operate from the same ground truth. With everything centralized, you can proactively react to customer signals for upsell and churn while billing is seamlessly handled in the background.

LedgerUp is your AI billing teammate for B2B SaaS, transforming contract-based billing from a chore into a frictionless, revenue-accelerating process. We parse contracts, issue invoices, and collect payments in real-time, all while surfacing actionable analytics, allowing your finance team to escape spreadsheet chaos and focus on strategic growth. Just close deals and let us handle your billing for you.

We use generative AI to call insurance on behalf of healthcare clinics. We save clinics up to 40 hours of calls every week over existing outsourced human solutions. Compared to the existing solutions for benefits verifications: - We're faster -- by default, we have a turnaround of 24 hours compared to typically a 3 day turnaround for competitors - We can reach more payors -- as long as they have a phone line, we can support calling them for benefits. There's quite a few payors in both medical and dental (e.g. Seledent) that have yet to offer a digital retrieval of benefits - We're reliable and consistent -- there is no person-to-person variation or question skipping when it comes to working with software

Quill Bills is a medical billing company that works with healthcare providers to significantly lower billing costs and recover denied claims. Our platform performs much of a biller's job autonomously, and we sell this platform to private practice doctors and medical MSOs.

At Lago, we're on a mission to make billing simpler, more transparent, and more adaptable for SaaS companies. As the leading open-source billing platform, we empower businesses to build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark, reflecting strong confidence in our vision and growth. Our platform has garnered over 9,000 stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, Synthesia and Mistral.ai choose Lago for their billing. We're a team of ambitious, focused individuals who work together to solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity - we trust each other to own tasks, drive them to completion, and adapt quickly. While we encourage you to try fast and "fail fast", we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you.