AvailEngine

One REST API for scheduling, reservations, and availability. Scoped keys, idempotency, webhooks, and Stripe deposits — built in. Deploy anywhere. Build in less than an hour using our agent and agent skills for Claude Code, Gemini, and any other CLI. One API, any vertical: Restaurants, salons, clinics, photographers — same endpoints, same integration. No per-vertical specialization needed. What's a business?: A business is a tenant — one restaurant, one salon, one gym. Each business has its own resources, bookings, settings, and API keys. You manage them all under one developer account. How bookings work: Booking limits are per business, not per developer. On the Starter plan, each of your 5 businesses gets 100 bookings/month. One business hitting its cap doesn't affect the others — they each get their full allowance independently. Webhooks: Webhooks keep your app in sync. AvailEngine sends real-time HTTP callbacks when bookings are created, confirmed, completed, or cancelled. Each endpoint is a URL you configure to receive these events. The plan limit is how many distinct webhook URLs you can register. Dynamic booking: Dynamic booking replaces fixed time slots with real-time resource availability. Guests pick any time, the API answers whether something is free right now.