# TIER 321 LLC – Cal.com booking page > TIER 321 LLC is a Virginia-based AI and software product company. We design, develop, and operate products for business, play, learning, and everyday life. Our portfolio includes Tower 321, an AI coordination platform available in beta; DragonCode Pro, an available browser-based card-code scanner; and TCG Loyalty, which is preparing to launch for card stores and their communities. Book a conversation about a product, a demo, or a potential partnership. Visit https://tier321.com/products for current availability and https://tier321.com/about for company information. Booking page: https://cal.com/tier321 ## Event types - [15-Minute Intro Call](https://cal.com/tier321/15min): 15 min, confirmed instantly, event type id 5298467. A short conversation about what you'd like to take off your plate. Bring one example or a rough idea. Details: https://cal.com/tier321/15min.md - [30-Minute Discovery Session](https://cal.com/tier321/30min): 30 min, requires the host’s confirmation, event type id 5298465. A focused conversation about how a TIER 321 product could fit your needs, or about a potential partnership. We will discuss your goals, relevant product capabilities, current limitations, availability, and possible next steps. Please include the product or topic you want to discuss when booking. TIER 321 LLC is a Virginia-based AI and software product company. Current products and availability: https://tier321.com/products Details: https://cal.com/tier321/30min.md ## Check availability ```http GET https://api.cal.com/v2/slots?eventTypeId=&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone= cal-api-version: 2024-09-04 ``` The response is `{"data":{"YYYY-MM-DD":[{"start":""}]}}`; no API key is needed. ## Book Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`). ## More - API docs: https://cal.com/docs/api-reference/v2/introduction