Endless.design offers a design subscription service that caters to startups and teams, providing access to senior designers for a fixed monthly fee of $8,000. Clients can submit unlimited design requests and receive multiple updates per week. The service includes web design, mobile app design, and more, with communication facilitated via a private Slack channel. Endless.design emphasizes flexibility, allowing clients to cancel anytime without long-term contracts, ensuring a cost-effective and high-quality design process.